Month: November 2022

Fuchigami, Takeshi’s team published research in Molecular Imaging and Biology in 22 | CAS: 97845-58-4

Molecular Imaging and Biology published new progress about 97845-58-4. 97845-58-4 belongs to bromides-buliding-blocks, auxiliary class Other Aliphatic Heterocyclic,Bromide, name is 5-(2-Bromoethyl)-2,2-dimethyl-1,3-dioxane, and the molecular formula is C8H15BrO2, Name: 5-(2-Bromoethyl)-2,2-dimethyl-1,3-dioxane.

Fuchigami, Takeshi published the artcileSynthesis and Characterization of 9-(4-[18F]Fluoro-3-(hydroxymethyl)butyl)-2-(phenylthio)-6-oxopurine as a Novel PET Agent for Mutant Herpes Simplex Virus Type 1 Thymidine Kinase Reporter Gene Imaging, Name: 5-(2-Bromoethyl)-2,2-dimethyl-1,3-dioxane, the publication is Molecular Imaging and Biology (2020), 22(5), 1151-1160, database is CAplus and MEDLINE.

Purpose: [18F]FHBG has been used as a positron emission tomog. (PET) imaging tracer for the monitoring of herpes simplex virus type 1 thymidine kinase (HSV1-tk), a reporter gene for cell and gene therapy in humans. However, this tracer shows inadequate blood-brain barrier (BBB) penetration and, therefore, would be limited for accurate quantification of reporter gene expression in the brain. Here, we report the synthesis and evaluation of 9-(4-[18F]fluoro-3-(hydroxymethyl)butyl)-2(phenylthio)-6-oxopurine ([18F]FHBT) as a new PET tracer for imaging reporter gene expression of HSV1-tk and its mutant HSV1-sr39tk, with the aim of improved BBB penetration. Procedures: [18F]FHBT was prepared by using a tosylate precursor and [18F]KF. The cellular uptake of [18F]FHBT was performed in HSV1-sr39tk-pos. (+) or HSV1-sr39tk-neg. (-) MDA-MB-231 breast cancer cells. The specificity of [18F]FHBT to assess HSV1-sr39tk expression was evaluated by in vitro blocking studies using 1 mM of ganciclovir (GCV). Penetration of [18F]FHBT and [18F]FHBG across the BBB was assessed by dynamic PET imaging studies in normal mice. Results: The tosylate precursor reacted with [18F]KF using Kryptofix2.2.2 followed by deprotection to give [18F]FHBT in 10 % radiochem. yield (decay-corrected). The uptake of [18F]FHBT in HSV1-sr39tk (+) cells was significantly higher than that of HSV1-sr39tk (-) cells. In the presence of GCV (1 mM), the uptake of [18F]FHBT was significantly decreased, indicating that [18F]FHBT serves as a selective substrate of HSV1-sr39TK. PET images and time-activity curves of [18F]FHBT in the brain regions showed similar initial brain uptakes (∼12.75 min) as [18F]FHBG (P > 0.855). Slower washout of [18F]FHBT was observed at the later time points (17.75 – 57.75 min, P > 0.207). Conclusions: Although [18F]FHBT showed no statistically significant improvement of BBB permeability compared with [18F]FHBG, we have demonstrated that the 2-(phenylthio)-6-oxopurine backbone can serve as a novel scaffold for developing HSV1-tk/HSV1-sr39tk reporter gene imaging agents for addnl. research in the future.

Molecular Imaging and Biology published new progress about 97845-58-4. 97845-58-4 belongs to bromides-buliding-blocks, auxiliary class Other Aliphatic Heterocyclic,Bromide, name is 5-(2-Bromoethyl)-2,2-dimethyl-1,3-dioxane, and the molecular formula is C8H15BrO2, Name: 5-(2-Bromoethyl)-2,2-dimethyl-1,3-dioxane.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Asukabe, Hirohiko et al. published their research in Journal of Chromatography A in 1993 | CAS: 80480-15-5

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Most organobromine compounds, like most organohalide compounds, are relatively nonpolar. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.Synthetic Route of C18H11BrO

Improvement of chemical analysis of antibiotics. XX Basic study on high-performance liquid chromatographic determination of four polyether antibiotics pre-derivatized with 1-bromoacetylpyrene was written by Asukabe, Hirohiko;Murata, Hideaki;Harada, Ken-Ichi;Suzuki, Makoto;Oka, Hisao;Ikai, Yoshitomo. And the article was included in Journal of Chromatography A in 1993.Synthetic Route of C18H11BrO The following contents are mentioned in the article:

A high-performance liquid chromatog. method for the determination of the polyether antibiotics (PEs), salinomycin (SL), monensin (MN), lasalocid (LA) and narasin (NA), based on a precolumn reaction system using 1-bromoacetylpyrene (1-BAP) as a fluorescence reagent, was established. Six standards of 1-pyrenacyl esters (PEs-PYs) including two of 1-pyrenacyl esters of internal standards, 18,19-dihydrosalinomycin (DSL) and 18,19-dihydro-20-ketosalinomycin (DKSL), were separated within 30 min on a Develosil 5C18 (5 μm) column (250×4.6 mm I.D.) with methanol-water (97:3) as the mobile phase at a flow-rate of 1.0 mL/min and were detected at λex 360 nm, λem 420 nm. This system was also effective for the separation between unused 1-BAP and PEs-PYs and the simultaneous determination of SL, MN, LA and NA was achieved at concentrations from 0.2 to 100 μg/mL. At concentrations of less than 10 μg/mL a silica gel cartridge was effective in eliminating the excess of unused reagents. Four calibration graphs with the internal standard method were linear between 20 and 100 μg/mL, 2 and 10 μg/mL and 0.2 and 1.0 μg/mL. The method is applicable to feed and residue analyses. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Synthetic Route of C18H11BrO).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Most organobromine compounds, like most organohalide compounds, are relatively nonpolar. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.Synthetic Route of C18H11BrO

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Schultz, T. W. et al. published their research in SAR and QSAR in Environmental Research in 2007 | CAS: 80480-15-5

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. alpha-Bromoesters are employed in the Reformatsky reaction for the synthesis of beta-hydroxyesters. The principal reactions for organobromides include dehydrobromination, Grignard reactions, reductive coupling, and nucleophilic substitution.Synthetic Route of C18H11BrO

Structure-activity relationships for abiotic thiol reactivity and aquatic toxicity of halo-substituted carbonyl compounds was written by Schultz, T. W.;Ralston, K. E.;Roberts, D. W.;Veith, G. D.;Aptula, A. O.. And the article was included in SAR and QSAR in Environmental Research in 2007.Synthetic Route of C18H11BrO The following contents are mentioned in the article:

Using abiotic thiol reactivity (EC50) and Tetrahymena pyriformis toxicity (IGC50) data for a group of halo-substituted ketones, esters and amides (i.e. SN2 electrophiles) and related compounds a series of structure-activity relationships are illustrated. Only the α-halo-carbonyl-containing compounds are observed to be thiol reactive with the order I > Br > Cl > F. Further comparisons disclose α-halo-carbonyl compounds to be more reactive than non-α-halo-carbonyl compounds; in addition, the reactivity is reduced when the number of C atoms between the carbonyl and halogen is greater than one. Comparing reactivity among α-halo-carbonyl-containing compounds with different β-alkyl groups shows the greater the size of the β-alkyl group the lesser the reactivity. A comparison of reactivity data for 2-bromoacetyl-containing compounds of differing dimensions reveals little difference in reactivity. Regression anal. demonstrates a linear relationship between toxicity and thiol reactivity: log(IGC-150) = 0.848 log(EC-150) + 1.40; n = 19, s = 0.250, r2 = 0.926, r2(pred) = 0.905, F = 199, Pr > F = 0.0001. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Synthetic Route of C18H11BrO).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. alpha-Bromoesters are employed in the Reformatsky reaction for the synthesis of beta-hydroxyesters. The principal reactions for organobromides include dehydrobromination, Grignard reactions, reductive coupling, and nucleophilic substitution.Synthetic Route of C18H11BrO

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Wei, Bin et al. published their research in Advanced Functional Materials in 2010 | CAS: 922721-30-0

3-Bromo-9-(4-fluorophenyl)-9H-carbazole (cas: 922721-30-0) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. When the molecular ion is detected, the bromine and chlorine isotope patterns are very distinct, but caution is to be exercised for certain mixed chlorinated/brominated compounds, which can look similar to homohalogen patterns.Formula: C18H11BrFN

Stable, Glassy, and Versatile Binaphthalene Derivatives Capable of Efficient Hole Transport, Hosting, and Deep-Blue Light Emission was written by Wei, Bin;Liu, Ji-Zhong;Zhang, Yong;Zhang, Jian-Hua;Peng, Hua-Nan;Fan, He-Liang;He, Yan-Bo;Gao, Xi-Cun. And the article was included in Advanced Functional Materials in 2010.Formula: C18H11BrFN The following contents are mentioned in the article:

Organic light-emitting diodes (OLEDs) have great potential applications in display and solid-state lighting. Stability, cost, and blue emission are key issues governing the future of OLEDs. The synthesis and photoelectronics of 3 kinds of binaphthyl (BN) derivatives are reported. BN1-3 are melting-point-less and highly stable materials, forming very good, amorphous, glass-like films. They decompose at temperatures ≤485-545°. At a constant c.d. of 25 mA cm-2, an ITO/BN3/Al single-layer device has a much-longer lifetime (>80 h) than that of an ITO/NPB/Al single-layer device (8 h). Also, the lifetime of a multilayer device based on BN1 is longer than a similar device based on NPB. BNs are efficient and versatile OLED materials: they can be used as a hole-transport layer (HTL), a host, and a deep-blue-light-emitting material. This versatility may cut the cost of large-scale material manufacture More importantly, the deep-blue electroluminescence (emission peak at 444 nm with CIE coordinates (0.16, 0.11), 3.23 cd A-1 at 0.21 mA cm-2, and 25200 cd m-2 at 9 V) remains very stable at very high current densities up to 1000 mA cm-2. This study involved multiple reactions and reactants, such as 3-Bromo-9-(4-fluorophenyl)-9H-carbazole (cas: 922721-30-0Formula: C18H11BrFN).

3-Bromo-9-(4-fluorophenyl)-9H-carbazole (cas: 922721-30-0) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. When the molecular ion is detected, the bromine and chlorine isotope patterns are very distinct, but caution is to be exercised for certain mixed chlorinated/brominated compounds, which can look similar to homohalogen patterns.Formula: C18H11BrFN

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Jordan, Alfonzo D.’s team published research in Journal of Organic Chemistry in 68 | CAS: 111865-47-5

Journal of Organic Chemistry published new progress about 111865-47-5. 111865-47-5 belongs to bromides-buliding-blocks, auxiliary class Benzenes, name is Mono(N,N,N-trimethyl-1-phenylmethanaminium) tribromide, and the molecular formula is C10H16Br3N, Safety of Mono(N,N,N-trimethyl-1-phenylmethanaminium) tribromide.

Jordan, Alfonzo D. published the artcileEfficient Conversion of Substituted Aryl Thioureas to 2-Aminobenzothiazoles Using Benzyltrimethylammonium Tribromide, Safety of Mono(N,N,N-trimethyl-1-phenylmethanaminium) tribromide, the publication is Journal of Organic Chemistry (2003), 68(22), 8693-8696, database is CAplus and MEDLINE.

The reaction of mol. bromine (Br2) with arylthioureas is known to produce 2-aminobenzothiazoles (Hugerschoff reaction). The authors show here that benzyltrimethylammonium tribromide, a stable, crystalline organic ammonium tribromide (OATB), can be readily utilized as an alternative electrophilic bromine source. It is easier to control the stoichiometry of addition with an OATB, which minimizes aromatic bromination caused by excess reagent. The authors have developed a direct procedure from isothiocyanates and amines using tetrabutylammonium thiocyanate (Bu4NSCN) and PhCH2NMe3Br3 to afford functionalized 2-aminobenzothiazoles.

Journal of Organic Chemistry published new progress about 111865-47-5. 111865-47-5 belongs to bromides-buliding-blocks, auxiliary class Benzenes, name is Mono(N,N,N-trimethyl-1-phenylmethanaminium) tribromide, and the molecular formula is C10H16Br3N, Safety of Mono(N,N,N-trimethyl-1-phenylmethanaminium) tribromide.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Kurach, Pawel’s team published research in European Journal of Organic Chemistry in | CAS: 849062-12-0

European Journal of Organic Chemistry published new progress about 849062-12-0. 849062-12-0 belongs to bromides-buliding-blocks, auxiliary class Bromide,Boronic acid and ester,Benzene,Ether,Boronic Acids,Boronic acid and ester, name is (3-Bromo-5-methoxyphenyl)boronic acid, and the molecular formula is C7H8BBrO3, Synthetic Route of 849062-12-0.

Kurach, Pawel published the artcileOne-pot generation of lithium (lithiophenyl)trialkoxyborates from substituted dihalobenzenes (Hal = Br, I) and their derivatization with electrophiles, Synthetic Route of 849062-12-0, the publication is European Journal of Organic Chemistry (2008), 3171-3178, database is CAplus.

The simple one-pot approach to synthetically useful phenyl-trialkoxyborates bearing lithium at the Ph ring has been developed starting with 1,3- and 1,4-diiodobenzene, as well as several activated dibromobenzenes and bromoiodo-benzenes. The general sequence of transformations involves halogen-lithium exchange by using nBuLi and subsequent boronation with a trialkylborate. The resulting lithium (halophenyl)trialkoxyborates were then subjected to halogen-lithium exchange in situ with a second equivalent of nBuLi to give dianionic lithium (lithiophenyl)trialkoxyborates. Treatment with selected electrophiles afforded substituted arylboronic acids and/or their pinacol esters as final products in moderate-to-good yields.

European Journal of Organic Chemistry published new progress about 849062-12-0. 849062-12-0 belongs to bromides-buliding-blocks, auxiliary class Bromide,Boronic acid and ester,Benzene,Ether,Boronic Acids,Boronic acid and ester, name is (3-Bromo-5-methoxyphenyl)boronic acid, and the molecular formula is C7H8BBrO3, Synthetic Route of 849062-12-0.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Durka, Krzysztof’s team published research in European Journal of Organic Chemistry in 2013 | CAS: 1450711-53-1

European Journal of Organic Chemistry published new progress about 1450711-53-1. 1450711-53-1 belongs to bromides-buliding-blocks, auxiliary class Bromide,Boronic acid and ester,Benzene,Boronic Acids,Boronic Acids,Boronic acid and ester, name is (2-Bromo-5-methylphenyl)boronic acid, and the molecular formula is C7H8BBrO2, Product Details of C7H8BBrO2.

Durka, Krzysztof published the artcileThe Influence of Boronate Groups on the Selectivity of the Br-Li Exchange in Model Dibromoaryl Boronates, Product Details of C7H8BBrO2, the publication is European Journal of Organic Chemistry (2013), 2013(15), 3023-3032, database is CAplus.

The selectivity of the Br/Li exchange reaction of 6-butyl-2-(2,5-dibromophenyl)-1,3,6,2-dioxazaborocane (2,5-Br2C6H3B(OCH2CH2)2NBu) and the analogous anionic derivatives, 2,5-Br2C6H3B(OiPr)3Li and 2,5-Br2C6H3BF3K, was studied using BuLi as the lithiating reagent. In the case of the former compound there was a slight preference for lithiation at the 5-position. For 2,5-Br2C6H3B(OiPr)3Li, the lithiation occurred exclusively at C5, but for 2,5-Br2C6H3BF3K, 2-lithiation was preferred. Calculations performed for the lithiation of ortho- and meta-brominated Ph boronates revealed that ortho-lithiated aryl boronates are thermodynamically more stable, but that the Br/Li exchange is generally dictated by kinetics, which accounts for the variation of selectivity depending on the type of boronate group. The successful generation of the 2,5-dilithiophenyl boronate species 2,5-Li2C6H3B(OCH2CH2)2NBu by a double Br/Li interconversion is reported. The Br/Li exchange in the related 6-butyl-2-[3-(2,5-dibromothienyl)]-1,3,6,2-dioxazaborocane, 2,5-Br2-3-ThB(OCH2CH2)2NBu, occurred preferentially at the 5-position, but the product was readily transformed into the more stable 2-lithiated isomer. The use of 2 equiv of BuLi resulted in the efficient formation of the dilithiated species, 2,5-Li2-3-ThB(OCH2CH2)2NBu. The obtained lithiated aryl boronates were converted into functionalized arylboronic acids by treatment with selected electrophiles.

European Journal of Organic Chemistry published new progress about 1450711-53-1. 1450711-53-1 belongs to bromides-buliding-blocks, auxiliary class Bromide,Boronic acid and ester,Benzene,Boronic Acids,Boronic Acids,Boronic acid and ester, name is (2-Bromo-5-methylphenyl)boronic acid, and the molecular formula is C7H8BBrO2, Product Details of C7H8BBrO2.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Lepeltier, Marc’s team published research in Chemical Communications (Cambridge, United Kingdom) in 46 | CAS: 52431-30-8

Chemical Communications (Cambridge, United Kingdom) published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Quality Control of 52431-30-8.

Lepeltier, Marc published the artcileNew azaborine-thiophene heteroacenes, Quality Control of 52431-30-8, the publication is Chemical Communications (Cambridge, United Kingdom) (2010), 46(37), 7007-7009, database is CAplus and MEDLINE.

A new class of heteroacenes containing B, N and S elements in the 22-electron aromatic nucleus was synthesized by reaction of diaminoterthiophenes with dichlorophenylborane. Their structure was studied by x-ray crystallog. and DFT calculations UV-visible absorption /emission spectroscopy shows high rigidity and deep-blue fluorescence of these compounds

Chemical Communications (Cambridge, United Kingdom) published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Quality Control of 52431-30-8.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Arbuzov, B. A.’s team published research in Zhurnal Obshchei Khimii in 21 | CAS: 594-81-0

Zhurnal Obshchei Khimii published new progress about 594-81-0. 594-81-0 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 2,3-Dibromo-2,3-dimethylbutane, and the molecular formula is C6H12Br2, Application In Synthesis of 594-81-0.

Arbuzov, B. A. published the artcileAction of triethyl phosphite and diethyl sodium phosphite on some dihalo derivatives, Application In Synthesis of 594-81-0, the publication is Zhurnal Obshchei Khimii (1951), 99-107, database is CAplus.

To (EtO)2PONa (from 44.2 g. ester and 7.2 g. Na) in 450 ml. dry Et2O was added 28.5 g. ClCH2CH2CN, b10 63-5°, n20D 1.4370, d2020 1.1461, over 0.5 hr.; after refluxing 1 hr., the filtrate yielded 42.7 g. (70.2%) (EtO)2P(O)CH2CH2CN, b7 150-2°, b2 127-8°, n20D 1.4380, d2020 1.1127; this (9.9 g.) heated 8 hrs. to 115-30° in a sealed tube with 30 ml. 2:1 HCl and evaporated gave 6.2 g. (78.5%) (HO)2P(O)CH2CH2CO2H, m. 166° (by Soxhlet extraction with dry C6H6, then with dry Me2CO). Addition of 40.6 g. BrCH2CHBrCN, b10 89-90°, n20D 1.5390, d2020 2.0955, to (EtO)2PONa (from 53.3 g. ester and 8.7 g. Na) in 500 ml. Et2O and treatment as above gave after repeated fractionation 7 g. (11.9%) (EtO)2POH, b7 60-5°, n20D 1.4080, d2020 1.0667, and 9.5 g. (26.4%) (EtO)2P(O)C(CN):CH2 or (EtO)2P(O)CH:CHCN, b1 124-7°, n20D 1.4360, d2020 1.1277, soluble in H2O and reacting rapidly with Br water or KMnO4; hydrolysis with 1:1 HCl 10 hrs. at 150-65° gave on evaporation a mixture of products, which, on removal of NH4Cl by addition of dry EtOH and evaporation of the extract, gave 4 g. oil; this with BaCO3 gave a mixture of Ba salts, from which was isolated a H2O-insoluble Ba salt, possibly C6H4P2O11Ba3, BaHPO4, or Ba phosphonoacrylate; a considerable amount of H2O-soluble C6H8O10P2Ba was also isolated. The products were not identified further. Addition of 32.8 g. (EtO)3P to 20.2 g. BrCH2CHBrCN over 0.5 hr. led to a temperature rise to 87°, where it was kept for removal of the EtBr; after 15 min. at 150°, the mixture yielded a total of 19 g. EtBr, but distillation of the residue failed to yield definite products. Addition of 16.1 g. PhCH:CHBr, b10 88-90°, n20D 1.6018, d2020 1.4094, to (EtO)2PONa (from 13.1 g. ester and 2 g. Na) in 100 ml. MePh (in Et2O the reaction does not occur) gave no immediate NaBr, but after a 4-hr. reflux 6.6 g. NaBr precipitated and fractionation of the solution gave 7.1 g. (44%) original bromide and 1.9 g. (12%) PhCH(PO3Et2)CH2P(O)(OEt)2, b1 181°, n20D 1.4920, d2020 1.1524, which on hydrolysis 7 hrs. at 120-30° with 1:1 HCl gave the free diphosphonic acid, m. 212-14° (from H2O). Possibly, both phosphono groups are attached to the terminal C atom, but no further characterization was attempted. PhCH:CHBr (14.9 g.) added to 14.5 g. (EtO)3P at 200-10° did not react and practically all the (EtO)3P was recovered; heating the components 8 hrs. to 180-200° in a sealed tube gave only traces of high-boiling products. Addition of 34.6 g. PhCHBrCH2Br in Et2O over 35 min. to (EtO)2PONa (from 37.5 g. ester and 6 g. Na) in 500 ml. Et2O, gave a precipitate of NaBr and, after refluxing 2 hrs., 6.3 g. (53.7%) styrene, about 12 g. (EtO)2POH, 4.8 g. unreacted dibromide, and about 14 g. of a fraction b11 90-132°, which on redistillation gave a liquid, b3 105-130°; this with 2-C10H7NH2 gave 1.2 g. (EtO)2P(O)NHC10H7-2, m. 69°, which indicated that the high-boiling liquid was probably (EtO)2POP(O)(OEt)2 (cf. Arbuzov and Arbuzov, C.A. 25, 3618). Addition of 22 g. (EtO)3P over 1 hr. to 16 g. PhCHBrCH2Br preheated to 155-60° and heating 1 hr. to 165-70° gave 8.6 g. EtBr, 4.7 g. (50.2%) styrene, 3.8 g. crude (EtO)2POH, b11 69-72°, 1.7 g. unreacted dibromide, and 10.3 g. crude liquid, b2 103-57°, which on redistillation gave a product, b2 117-31°, forming with 2-C10H7NH2, 0.8 g. (EtO)2P(O)NHC10H7, corresponding to a 4.8% yield of tetra-Et subphosphate. When PhCHBrCH2Br is heated alone to 155-70°, much HBr forms, thus explaining the formation of (EtO)2POH above. Heating 9.2 g. dibromide to 195-205°, gradual addition of 10.2 g. (EtO)2POH, and heating 1 hr. to 210-15° gave 4.1 g. EtBr and about 1.5 g. styrene (crude). Addition of 21.4 g. PhCMe:CHBr, b11 103-5°, n20D 1.5880, d2020 1.3790, to (EtO)2PONa (from 16 g. ester and 2.5 g. Na) in 200 ml. Et2O and refluxing 1 hr. gave 2.1 g. unreacted bromide and 4 g. (16%) PhCMe:CHP(O)(OEt)2, b1 146-9°, n20D 1.5210, d2020 1.1094, which immediately reacts with Br; hydrolysis by 1:1 HCl 6 hrs. at 135-45° in a sealed tube and evaporation gave some crude PhCMe:CH2 and H3PO4, isolated as the PhNHNH2 salt, m. 155° (from EtOH). Addition over 40 min. of 12.5 g. (EtO)3P to 13.6 g. PhCMe:CHBr preheated to 150-60° and heating 1 hr. to 165-70° gave 2.3 g. EtBr, 2.1 g. unreacted bromide, 3.1 g. (EtO)2POH, and 5 g. (33.5%) PhCMe:CHP(O)(OEt)2, b1.5 149-50°, n20D 1.5190, d2020 1.1009, which on hydrolysis with 1:1 HCl at 120-30° cleaves into H3PO4 and PhCMe:CH2. PhCMeBrCH2Br (30.6 g.) with (EtO)2PONa (from 33 g. ester and 5.3 g. Na) in 400 ml. Et2O, refluxed 2 hrs., gave 5.9 g. (45.4%) PhCMe:CH2 and apparently about 6 g. (EtO)2POH; no individual substances of higher b.p. were identified. (EtO)2PONa with (Me2CBr)2 yields apparently tetra-Et subphosphate and Me2C:CMe2.

Zhurnal Obshchei Khimii published new progress about 594-81-0. 594-81-0 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 2,3-Dibromo-2,3-dimethylbutane, and the molecular formula is C6H12Br2, Application In Synthesis of 594-81-0.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Pruschinski, Lucas’s team published research in Synthesis in 52 | CAS: 52431-30-8

Synthesis published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Application of 2,5-Dibromo-3,4-dinitrothiophene.

Pruschinski, Lucas published the artcileSuzuki-Miyaura Cross-Couplings under Acidic Conditions, Application of 2,5-Dibromo-3,4-dinitrothiophene, the publication is Synthesis (2020), 52(6), 882-892, database is CAplus.

Suzuki-Miyaura reactions with Pd(PPh3)4 had carried out using lithium N-phenylsydnone-4-carboxylate as additive, which gave best yields at pH 5.7 in a mixture of acetic acid, water, and sodium carbonate. Reaction parameters such as the Pd source, the solvent, reaction time and temperature, acid, base and carboxylate have been varied and some representative examples of the Suzuki-Miyaura reaction have been examined

Synthesis published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Application of 2,5-Dibromo-3,4-dinitrothiophene.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary