Month: December 2022

Kakinami, Takaaki published the artcileHalogenation using quaternary ammonium polyhalides. XX. Bromination of phenols with polymer-bound benzyltrimethylammonium tribromide, Synthetic Route of 111865-47-5, the publication is Bulletin of the Chemical Society of Japan (1989), 62(10), 3373-5, database is CAplus.

Bromo-substituted phenols were obtained quant. by passing a solution of phenols in dichloromethane-methanol through a column packed with styrene polymer-bound benzyltrimethylammonium tribromide. Yields were 91-99%.

Bulletin of the Chemical Society of Japan 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, Synthetic Route of 111865-47-5.

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

Katz, Thomas J. published the artcileSynthesis and properties of optically active helical metallocene oligomers, COA of Formula: C4H10Br2CoO2, the publication is Journal of the American Chemical Society (1993), 115(8), 3182-98, database is CAplus.

Syntheses are described for optically active oligomers, of I (R = H, SiMe₃) and CO⁺PF₆^–. The steps required have three essential features: (1) a bromine directs a photocyclization, blocking both the position it occupies and the one adjacent. (2) An acid scavenger (propylene oxide) prevents benzylic ethers from being eliminated during photocyclization. (3) The stereogenicity of one carbon controls the direction in which the helix winds. The oligomers are the first to be prepared in which metallocenes are joined by conjugated systems of double bonds. Their optical activity is very high. The cyclic voltammogram of the Co-containing oligomer of I (R = H) (II) shows two cathodic waves whose closeness implies that the interaction between adjacent units is weak. When II is reduced electrochem. on Pt, a film of neutral oligomers is produced. This film is conductive, and it catalyzes charge transfer. Its weight, measured using a quartz crystal microbalance after the amount of reduction was analyzed coulometrically, measured the mol. weight of II.

Journal of the American Chemical Society published new progress about 18346-57-1. 18346-57-1 belongs to bromides-buliding-blocks, auxiliary class Cobalt, name is Cobalt(II) dibromo(1,2-dimethoxyethane), and the molecular formula is C4H10Br2CoO2, COA of Formula: C4H10Br2CoO2.

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

Ding, Jiafeng published the artcileSynthesis, purification and characterization of several typical polybrominated diphenyl ethers (PBDEs) and polybrominated biphenyls (PBBs), Related Products of bromides-buliding-blocks, the publication is Huanjing Huaxue (2015), 34(7), 1377-1379, database is CAplus.

Several typical polybrominated di-Ph ethers (PBDEs), e. g., I, and polybrominated biphenyls (PBBs), e. g., II were synthesized by using coupling, oxidation and bromination, purified by using C18 semi-preparation HPLC, and then identified by using gas chromatog.-mass spectrometry (GC-MS) and ¹H-NMR (NMR). The results showed that the prepared products were consistent with the target products, with the purity over 99%.

Huanjing Huaxue 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, Related Products of bromides-buliding-blocks.

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

Hi, Jianxing published the artcileResearch on synthesis of chiral quinine quaternary ammonium ligand and its catalyzing activity for Darzens reaction, Name: 4-Bromo-1-(bromomethyl)-2-fluorobenzene, the publication is Guangdong Huagong (2013), 40(7), 27-29, 31, database is CAplus.

Through quaternization reaction of a series of halogenated hydrocarbons and quinine alkali, a series of chiral quinine quaternary ammonium salt ligands were generated with quinine as base matrix and its synthesized ligand structure was confirmed by ¹H-NMR, IR and MS. And catalytic performance of ligands in Darzens condensation reaction between 2-chloroacetophenone and benzaldehyde in the asym. catalytic condition was investigated, implying that the chiral catalytic properties were associated with the steric size of substituents. And the best enantioselectivity of 46% was obtained.

Guangdong Huagong published new progress about 76283-09-5. 76283-09-5 belongs to bromides-buliding-blocks, auxiliary class Fluoride,Bromide,Benzyl bromide,Benzene, name is 4-Bromo-1-(bromomethyl)-2-fluorobenzene, and the molecular formula is C7H5Br2F, Name: 4-Bromo-1-(bromomethyl)-2-fluorobenzene.

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

Akula, Suri Babu published the artcileThieno-imidazole based small molecule hole transport materials for dopant-free, efficient inverted (p-i-n) perovskite solar cells, Related Products of bromides-buliding-blocks, the publication is Journal of Materials Chemistry C: Materials for Optical and Electronic Devices (2020), 8(46), 16577-16583, database is CAplus.

Two dipolar mols. based on a thieno-imidazole core, AI109 and AI112, were developed to study the effect of imparting polarity on the hole transport properties in inverted perovskite solar cells (PSCs). These hole transport materials (HTMs) exhibit comparable optoelectronic properties but distinct film morphol. and charge transport characteristics. Besides, the new materials with very low concentrations (1 mg mL-1) are able to form smooth and continuous films. The PSCs based on AI109 and AI112 without any dopants and addnl. interlayers have achieved increased power conversion efficiencies of 13.32% and 13.42%, resp., compared to those of the standard HTMs, 2,2′,7,7′-tetrakis(N,N′-di-p-methoxyphenylamino)-9,9′-spirobifluorene [Spiro-OMeTAD, (11.62%)] and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate [PEDOT:PSS, (12.01%)]. The excellent hole mobility and the superior film morphol. of the AI-HTMs account for their higher efficiencies.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices 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, Related Products of bromides-buliding-blocks.

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

Cruickshank, Ewan published the artcileChalcogen bonding and liquid crystallinity: Understanding the anomalous behaviour of the 4′-(alkylthio)[1,1′-biphenyl]-4-carbonitriles (nSCB), Synthetic Route of 111-83-1, the publication is Journal of Molecular Liquids (2022), 117094, database is CAplus.

The synthesis and characterization of the first eleven members of the 4′-(alkylthio)[1,1′-biphenyl]-4-carbonitriles, I [n = 1, 2, 3, etc.] was reported. All eleven members I showed monotropic liquid crystal behavior. The first six members were exclusively nematogenic, the seventh member showed nematic and smectic A phases and the higher homologues only smectic A behavior. A comparison of their transitional behavior with that of the corresponding alkyl and alkyloxy-cyanobiphenyls revealed a new pattern of behavior. Specifically, the nematic-isotropic transition temperatures showed a large decrease on passing from the methylthio to ethylthio homologues. This unexpected behavior was interpreted in terms of chalcogen bonding.

Journal of Molecular Liquids published new progress about 111-83-1. 111-83-1 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromooctane, and the molecular formula is C8H17Br, Synthetic Route of 111-83-1.

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

Eubanks, Lisa M. published the artcileIdentification of α₂ Macroglobulin as a Major Serum Ghrelin Esterase, Application of 7-Bromohept-1-yne, the publication is Angewandte Chemie, International Edition (2011), 50(45), 10699-10702, S10699/1-S10699/23, database is CAplus and MEDLINE.

Ghrelin is an appetite-stimulating hormone secreted from endocrine cells in the stomach. Ghrelin is synthesized as a 117-residue polypeptide (preproghrelin) which undergoes proteolytic cleavage to produce the 94-residue proghrelin. Subsequent post-translational processing events include cleavage of proghrelin at residue Arg28 and octanoylation at the hydroxyl group of Ser3; these modifications generate the mature 28-residue ghrelin peptide. In serum, the inactivation of ghrelin is thought to occur primarily by deacylation of Ser3. In order to capture serum-based serine hydrolase enzymes that participate in the deacylation of circulating ghrelin, the present work describes the synthesis of a ghrelin-like “bait” mol. (probe 1) that contains a phosphonofluoridate warhead. The interaction of probe 1 with α₂-macroglobulin (α₂M) lead to addnl. studies which indicate that α₂M possesses ghrelin esterase activity and plays an important role in ghrelin metabolism

Angewandte Chemie, International Edition published new progress about 81216-14-0. 81216-14-0 belongs to bromides-buliding-blocks, auxiliary class Linker,PROTAC Linker, name is 7-Bromohept-1-yne, and the molecular formula is C7H11Br, Application of 7-Bromohept-1-yne.

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

Karstens, W. F. J. published the artcilePalladium catalyzed cyclization reactions of acetylenic lactams, Quality Control of 69361-41-7, the publication is Journal of Organometallic Chemistry (2001), 624(1-2), 244-258, database is CAplus.

Lactams and oxazolidinones containing a 3-butynyl side chain at the four- and the three-position, resp., have been prepared by reductive alkylation of cyclic imides or by S_N2′-substitution of bromopropadiene with highly functionalized enantiopure organozinc reagents. Treatment of these compounds with aryl halides and one vinyl bromide using Pd(PPh₃)₄ as a catalyst gives rise to a coupling-cyclization reaction, yielding bicyclic enamides in which the aryl or vinyl moiety is incorporated. Remarkably, these groups are transferred stereoselectively cis with respect to the nitrogen nucleophile onto the triple bond. Structural proof for this unusual stereochem. outcome has been obtained by crystal structure anal. and NOE-difference spectroscopy of the cyclized products.

Journal of Organometallic Chemistry published new progress about 69361-41-7. 69361-41-7 belongs to bromides-buliding-blocks, auxiliary class PROTAC Linker,Aliphatic Linker, name is (4-Bromobut-1-yn-1-yl)trimethylsilane, and the molecular formula is C7H13BrSi, Quality Control of 69361-41-7.

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

Wittig, Georg published the artcileNewer syntheses of cyclopolyenes. III. 5,8-diphenyl-1,2,3,4-dibenzocycloöctatetraene, Product Details of C6H12Br2, the publication is Justus Liebigs Annalen der Chemie (1956), 93-104, database is CAplus.

cf. C.A. 50, 8678f; preceding abstract To 12.4 millimoles LiMe in 25 cc. Et₂O under N were added very gradually 6.2 millimoles finely powd. (o-BzC₆H₄)₂ (I), m. 166-7°, yielding 2 g. mixture (II) of diastereoisomers, C₂₈H₂₆O₂, m. 149-77°, from which was isolated by repeated crystallization 39% [2-PhCMe(OH)C₆H₄]₂, m. 199.5-200° (from MeOH). II (1.1 g.) in 22 g. warm glacial AcOH and a few drops concentrated HCl was boiled 10 min., giving 94-6% 5-methyl-5,7-diphenyl-1,2,3,4-dibenzo-1,3,6-cycloheptatriene (III), m. 209-10° (from AcOEt). III (1 g.) in 30 cc. glacial AcOH was refluxed 6 hrs. with 5 cc. concentrated HI and 0.2 g. red P, poured into 70 cc. H₂O, filtered, extracted with AcOEt, refiltered, and the filtrate evaporated, giving 37% 5-methyl-5,7-diphenyl-1,2,3,4-dibenzo-1,3-cycloheptadiene, m. 127.5-29° (from MeOH), 1 g. of which in 15 cc. CCl₄ was boiled 0.5 hr. with 0.5 g. N-bromosuccinimide (freeing HBr), giving 88% III. I (13.5 g.) was shaken 3 days with a suspension of Ph₃P:CH₂ in 200 cc. Et₂O (prepared from 0.1 mole Ph₃PMeBr and 0.12 mole PhLi), centrifuged and the supernatant liquor treated with Et₂O and recentrifuged, and treated with H₂O yielding 19.2 g. insoluble Ph₃PO and from the Et₂O mother liquors (after washing with H₂O) 11.4 g. [o-PhC(:CH₂)C₆H₄]₂ (IV), m. 100-1° (from EtOH). IV in AcOH heated with a few drops HCl gave III. IV (1 g.) in Me₂CO, oxidized 12 hrs. at 40° with 5.4 millimoles KMnO₄, heated with MeOH, and filtered gave 71% I. IV (1 g.) in 20 cc. absolute Et₂O was shaken 8 hrs. under N with 1 g. Na wire followed by decantation, and titration with 0.25N MeOH (in Et₂O) to a colorless endpoint, washing with H₂O, and evaporation of the Et₂O gave 23% Va or Vb, rectangles, m. 177-8° (from Me₂CO). Inasmuch as the ultraviolet absorption spectrum of Va or Vb (in cyclohexane) resembles those of 9,10-dihydrophenanthrene and bisdiphenylenecyclobutane, structure Va is the more probable one. The spectrum of Vb would be expected to be similar to that of (2-MeC₆H₄)₂. When 1 g. IV in 30 cc. Et₂O was shaken 3 days with 1 g. Na, the reaction was more extensive (about 75% as indicated by the MeOH titration); a diastereoisomeric mixture (VI) (52.5%), m. 196-218° (from Me₂CO), was isolated; this when chromatographed on Al₂O₃ using cyclohexane-CCl₄ as developer gave 9.4% 5,8-diphenyl-1,2,3,4-dibenzo-1,3-cycloöctadiene (VII), m. 240-40.5°. Va (0.1 g.) in 15 cc. (CH₂OMe)₂ shaken 2 hrs. with 0.5 g. Na showed that about 93% had reacted and 71% of the calculated amount of VI, m. 194-205°, was isolated. The 5,8-di-Na complex (VIII) corresponding to VII was prepared under fully described conditions, from 7.3 millimoles IV and 1 g. Na; VIII was added to 8.4 millimoles (Me₂CBr)₂, m. 168-70°, in Et₂O. The decolorized mixture was washed with H₂O, freed from Et₂O and (Me₂C:)₂, taken up in cyclohexane, chromatographed on Al₂O₃ and eluted, with CCl₄, giving 30% Va and 9% IV. VIII reacted with HgCl₂ in Et₂O, giving 27% Va and 8% IV. A suspension of VII (prepared from 14 millimoles IV) treated 2 days with 30 millimoles Ph₃B in Et₂O gave 68% (Ph₃BH)Na (as indicated by the H evolved on addition of MeOH) and 2.45 g. 5,8-diphenyl-1,2-3,4-dibenzocycloöctatetraene (IX), m. 231-1.5° (from AcOH or Me₂CO). VIII (prepared from 0.56 millimole Va) treated with Ph₃B in Et₂O gave 64% IX. By heating 0.3 millimoles IX in 5 cc. AcOH 10 min. with 2 millimoles CrO₃ in 2 cc. AcOH, followed by addition of H₂O, extraction with Et₂O, evaporation, solution in C₆H₆, chromatographing on Al₂O₃ and eluting with CHCl₃, 69% I was obtained. Shaken 3 hrs. with 0.1 g. Raney Ni, 0.41 millimoles IX in 35 cc. dioxane took up 2 moles H, giving 87% VII. A Stuart-Briegleb calotte model indicates that IX can be free from strain only when the 2 olefin linkages in the cyclotetraene ring show a cis-cis configuration. 18 references.

Justus Liebigs Annalen der Chemie 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 C4H6O3, Product Details of C6H12Br2.

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

Bamford, W. R. published the artcileThe decomposition of p-tolylsulfonylhydrazones by alkali, HPLC of Formula: 594-81-0, the publication is Journal of the Chemical Society (1952), 4735-40, database is CAplus.

p-Tolylsulfonylhydrazones are decomposed by alkali or alkoxide to p-toluenesulfinate and either olefin or aryldiazomethanes. The necessary hydrazones were prepared by refluxing p-MeC₆H₄SO₂NHNH₂ 10 min. with the carbonyl compound in alc. Unless otherwise stated, in the following decompositions the reagent is Na in (CH₂OH)₂ (0.7-1.5N). The following tabulation is in the order, starting carbonyl compound, m.p. of p-tolylsulfonylhydrazone, product of decomposition, % yield: Me₂CO, 153°, CH₂:CHMe, -; cyclohexanone, 156°, cyclohexene, 100; PhCH₂COMe, 134-5°, PhCH:CHMe, 80; (Ph₂CH₂)₂CO, 186°, PhCH:CHCH₂Ph, 95; 1-indanone, 192°, indene, 92; Me₃CCOMe, 155°, (Me₂C:)₂ (as dibromide), 34; camphor, 163-4°, camphene [m. 46°, [α]_D¹⁷ 72.4° (Et₂O)], 94; EzH, 128°, PhCH₂OCH₂CH₂ OH (3,5-dinitrobenzoate, m. 78°), 54 (also p-MeC₆H₄SO₂CH₂Ph, 14); PhCOMe, 148°, (Me-PhC:N)₂ (m. 124°), 85; Ph₂CO, 184°, Ph₂C(OMe)CH₂OH (m.63°,) 14 [also (Ph₂C:)₂]; 9-fluorenone, 180-2° (decomposition), Δ^9,9′-bifluorene, 95; PhCH₂COPh, 143°, [Ph(PhCH₂)C:N]₂, 94; Ac₂, 204° (decomposition),4,5-dimethyl-1-(p-tolylsulfonamido)-1H-1,2,3-triazole (m. 139°), 79; (EtCO)₂, 187° (decomposition), 4,5-dipropyl-1-(p-tolylsulfonamido)-1H-1,2,3-triazole (m. 122-3°), 84; BzAc, 168° (decomposition), 4(or 5)methyl-5(or 4)-phenyl-1-(p-tolylsulfonamido)-1H-1,2,3-triazole (m. 179-81°), 72; Bz₂, 184° (decomposition), (CPh)₂, 73; benzoin, 144-5°, PhCH₂COPh, 65; AcCH₂CO₂Et, 105°, p-MeC₆H₄SO₂CHMeCH₂CO₂H, -; BzCH₂CO₂Et, 108°, p-MeC₆H₄SO₂CHPhCH₂CO₂H, -. The last three were carried out with KOH in (CH₂OH)₂.

Journal of the Chemical Society 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, HPLC of Formula: 594-81-0.

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