Tag: M.W=200-250

Rao, Suma published the artcileHigh resolution protein separations using affinity ultrafiltration with small charged ligands, Safety of Sodium 3-bromopropane-1-sulfonate, the publication is Journal of Membrane Science (2006), 280(1+2), 781-789, database is CAplus.

Although the feasibility of affinity ultrafiltration was demonstrated more than 20 years ago, com. applications have not developed due to the high cost and practical limitations of the large macroligands needed for highly selective separations The objective of this study was to examine the use of small charged affinity ligands for protein purification by exploiting electrostatic interactions between the charged complex and an elec.-charged membrane. Experiments were performed using bovine serum albumin and ovalbumin with Cibacron Blue as the affinity ligand. Neg. charged versions of a composite regenerated cellulose membrane were generated by covalent attachment of a sulfonic acid functionality. Binding experiments were used to identify appropriate conditions for protein separations The selectivity for the separation of BSA and ovalbumin was a function of the solution conditions, Cibacron Blue concentration, and membrane charge, with the addition of Cibacron Blue causing a 30-fold increase in selectivity. A diafiltration process was performed at the optimal conditions, giving a BSA product with a purification factor of more than 90-fold and a yield greater than 90%. These results clearly demonstrate the potential of using a small charged affinity ligand for high resolution protein separations

Journal of Membrane Science published new progress about 55788-44-8. 55788-44-8 belongs to bromides-buliding-blocks, auxiliary class Bromide,Salt,Aliphatic hydrocarbon chain,Aliphatic hydrocarbon chain, name is Sodium 3-bromopropane-1-sulfonate, and the molecular formula is C3H6BrNaO3S, Safety of Sodium 3-bromopropane-1-sulfonate.

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

Anderson, J. E. published the artcileIntrinsic asymmetry. Its effect on the chemical shift of groups which are not diastereotopic, SDS of cas: 594-81-0, the publication is Tetrahedron (1976), 32(22), 2789-93, database is CAplus.

The effect was determined of intrinsic asym. on the chem. shifts of Me2CRCMe2R1 (R = H, R1 = Cl, Br, I; R1 = R2 = Cl, Br, I, CN, Ph, 3-ClC6H3, Et, Me3CCH2; R = I, R1 = 4-MeOC6H4), in which rotation is slow on the NMR timescale. When R = R1 = alkyl or diamagnetically anisotropic Ph groups the intrinsic asym. shifts are very small. When either R or R1 is a halogen atom substantial intrinsic asym. shifts were observed; I > Br > Cl. The effect of 2 C-halogen bonds compared with one C-halogen and one C-H bond is inconsistent; 2 C-Cl bonds gave no shift, 2 C-Br bonds gave a reduced shift, and 2 C-I bonds gave an enhanced shift. The effect is tentatively linked to bond polarizability.

Tetrahedron 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, SDS of cas: 594-81-0.

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

Badr, M. Z. A. published the artcileMolecular rearrangements, part 33, photolysis and thermolysis of arylnitramines, Synthetic Route of 53484-26-7, the publication is Journal of Photochemistry and Photobiology, A: Chemistry (2004), 162(1), 163-170, database is CAplus.

UV irradiation of arylnitramines in 2,6-di-tert-butylphenol results in the transfer of the nitro group intermolecularly to produce the corresponding 4-nitrophenol together with nitroanilines in addition to oxidation products, diphenoquinone and the diphenolic compounds Thermolysis of arylnitramines or N-alkylarylnitramines at controlled temperatures either alone or in phenolic solvent, produce the corresponding p- and/or o-nitroanilines together with 4-nitrophenol, diphenoquinone and diphenol in addition to crystals of their dimeric product quinhydrone. No dimerization products of the arylamino radicals are detected. However, evolution of nitrogen, nitrogen dioxide and water drops are detected. Thermolysis of primary arylnitramines in β-naphthol results in separation of free radicals substitution product, 1-arylazo-2-naphthols as major products with evolution of nitrogen dioxide. However, such rearrangement products are not produced with secondary N-alkylarylnitramines. Other products of homolytic substitution of halogen by nitro group are identified.

Journal of Photochemistry and Photobiology, A: Chemistry published new progress about 53484-26-7. 53484-26-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Nitro Compound,Amine,Benzene, name is 4-Bromo-N-methyl-2-nitroaniline, and the molecular formula is C7H7BrN2O2, Synthetic Route of 53484-26-7.

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

Bergmann, A. G. published the artcileReactions of combination with conjugated systems of double linkings. II. Combination of hydrogen bromide with di-isopropenyl [β,γ-dimethyl-Δ^αγ-butadiene], Recommanded Product: 2,3-Dibromo-2,3-dimethylbutane, the publication is Zhurnal Russkago Fiziko-Khimicheskago Obshchestva (1920), 37-40, database is CAplus.

The combination of HBr with β,γ-dimethyl-Δ^αγ-butadiene in glacial AcOH takes place in the 2 stages: (1) CH₂:CMeCMe:CH₂ + HBr = CMe₂BrCMe:CH₂, and (2) the latter + HBr = CMe₂BrCMe₂Br (30%) + CMe₂BrCHMeCH₂Br (70%). γ-Bromo-β,γ-dimethyl-Δ^α-butene, C₆H₁₁Br, b₁₀₀ 84-6°, d₂₀ 1.2201, yields dimethylisopropenylcarbinol when hydrolyzed by means of aqueous KOH. β,γ-Dibromo-β,γ-dimethylbutane was described by Thiele (Ber. 27, 454). α,γ-Dibromo-β,γ-dimethylbutane is a liquid, b_16.5 88-9°, d₂₀ 1.6065. The product of the union of 1 mol. of HBr with isoprene, viz., γ-bromo-γ-methyl-Δ^α-butene, combines with a 2nd mol. of HBr, apparently giving only βδ-dibromo-β-methylbutane.

Zhurnal Russkago Fiziko-Khimicheskago Obshchestva 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, Recommanded Product: 2,3-Dibromo-2,3-dimethylbutane.

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

Bogonostseva, N. P. published the artcileReaction of some halogen derivatives with sodium diethyl phosphite, Recommanded Product: 2,3-Dibromo-2,3-dimethylbutane, the publication is Uchenye Zapiski, Kazan. Gosudarst. Univ. im. V. I. Ul’yanova-Lenina (1956), 116(No. 2), 71-128, database is CAplus.

Ph₂CHBr (10 g.) in Et₂O-C₆H₆ with (EtO)₂PONa from 5.35 g. ester and 0.9 g. Na gave NaBr and 61.33% (Ph₂CH)₂ and 5.3 g. unidentified yellow liquid Ph₂CHCl and (EtO)₂PONa did not react in Et₂O; in iso-Am₂O a little NaCl formed; in MePh a reaction took place after 2 h. reflux yielding a little Ph₂CHOH, (Ph₂CH)₂O, and 21% Ph₂CHP(O)(OEt)₂, b₄ 184-8°, d₀²⁰ 1.1277, n_D²⁰ 1.5460, m. 38-40°; the latter hydrolyzed with 10% HCl to the free acid, m. 223-5° (from H₂O); the same ester formed in 43.65% yield from (EtO)₃P with Ph₂CHBr in Et₂O; the ester, b₂ 180-1°, d₀²⁰ 1.1287, n_D²⁰ 1.5445, m. 39-40°, which hydrolyzed with 10% HCl at 150-80° to the free acid, m. 227-8°. (EtO)₂PONa in Et₂O with PhCH₂Cl readily gave 49.35% PhCH₂PO(OEt)₂ (I), b₁₁ 153-4°, d₀⁰ 1.1200, n_D²⁰ 1.4965, which hydrolyzed with 10% HCl to the free acid, m. 169-70°. Similarly, PhCH₂Br gave 44% I, b₁₂ 153-5°, d₀⁰ 1.1189, n_D²⁰ 1.4892, while PhCH₂I gave 21.1% I. To (EtO)₂PONa from 2.5 g. ester and 0.32 g. Na in Et₂O was added Ph₂CBrCCl₃ in Et₂O and after refluxing 2 h. there was obtained 1.9 g. NaBr, 32.05% (Ph₂CCCl₃)₂ (II), a glassy solid, b₃ 180-90°, and a range of products, b₈ 60° to b₃ 160°, which contain P; a substance C₁₀H₁₄O₃ClP, b₃ 154-60°, n_D²⁰ 1.5010, d₂₀²⁰ 1.2332, was isolated but not identified. Heating 8 g. (EtO)₃P with 15.4 g. Ph₂CBrCCl₃ to 155-60° 2 h. gave 42.4% II and some low-boiling material. Refluxing (EtO)₂PONa in Et₂O with Ph₂CClCCl₃ 6 h. gave NaCl and much unreacted halide; a similar reaction in dioxane in a sealed tube at 130-50° gave in 7 h. unreacted halide and Ph₂C:CCl₂. Ph₂CClCCl₃ (5 g.) and 3 g. (EtO)₈P refluxed 3 h. gave unreacted halide, Ph₂C:CCl₂, and no P-containing substance. Ph₂C:CH₂ with HBr gave crude Ph₂CBrMe, 10 g. of which with (EtO)₂PONa from 7.5 g. ester and 1.2 g. Na in Et₂O gave after refluxing 4 h. 6.35 g. NaBr, 6.9% Ph₂C:CH₂, and a crude substance, b_2.5 168-85°, which contains P. Ph₂CBrMe (5.05 g.) with 3.2 g. (EtO)₃P gave in 5 h. reflux EtBr and 44.9% crude Ph₂C:CH₂. Crude Ph₂CClMe (prepared from the olefin and HCl) with (EtO)₂PONa in Et₂O gave, after 3 h. reflux, NaCl and Ph₂C:CH₂; Ph₂CClMe with (EtO)₃P refluxed 3 h. gave mainly Ph₂C:CH₂. No appreciable reaction took place between (EtO)₂PONa and (1-C₁₀H₇)₂CHBr in Et₂O; the result was the same with (EtO)₃P in 2 h. at 200°; the same result was obtained with (1-C₁₀H₇)₂CHCl and (EtO)₂PONa in Et₂O, or in dioxane at 130-40°. Only slight reaction took place between (EtO)₂PONa and 9-bromofluorene in Et₂O; the latter with (EtO)₃P in 6 h. at 260° gave no EtBr and no reaction could be detected. 9-Chlorofluorene failed to react with (EtO)₂PONa or (EtO)₃P. 2-Bromocyclohexanone with (EtO)₂PONa in Et₂O gave 31% di-Et cyclohexanone-2-phosphonate, b_11.5 148-9, d₀⁰ 1.1270, n_D²⁰ 1.4578, which gave no definite products after hydrolysis with 10% HCl; similarly, 2-chlorocyclohexanone gave 35% above ester, b_11.5 151.5-3°, d₀⁰ 1.1380, n_D²⁰ 1.4518, which again failed to yield definite products after hydrolysis with HCl. 2-Chlorocyclohexanone with (EtO)₃P after 2 h. at 110-20° gave 54.5% above ester; hydrolysis of this with HCl gave some cyclohexanone and H₃PO₄. Bz₂CHBr with (EtO)₂PONa in Et₂O gave NaBr and 69.1% Bz₂CH₂; the same reaction in C₆H₆ gave 42.7% Bz₂CH₂, while 82.3% NaBr was isolated. Bz₂CHBr with (EtO)₃P gave 60.8% Bz₂CH₂. Bz₃CBr with (EtO)₂PONa in Et₂O gave 58.3% Bz₃CH, some Bz₂CH₂, and a substance, b₈ 90-1°, identified as (EtO)₃PO. Bz₃CBr with (EtO)₃P gave 56.6% Bz₃CH, and (EtO)₃PO. Bz₂CHBr in MePh with Na gave Bz₂CH₂ and some Bz₄C₂H₂; Na and Bz₃CBr in MePh gave a trace of Bz₃CH and unreacted halide. (EtO)₂PONa with o-C₆H₄(CO)₂CBrCO₂Et gave indanedione and some diphthalylethane, decompose 215°; (EtO)₃P gave the same products. o-C₆H₄(CO)₂CNaCO₂Et with (EtO)₂POCl in Et₂O gave diphthalylethane and indanedione. Bromoindanedione and (EtO)₂PONa gave diphthalylethane; (EtO)₃P gave indanedione. Bromoindanedione and Na in MePh gave indanedione. (EtO)₂PONa (from 15.85 g. ester) and 14 g. (Me₂CBr)₂ in Et₂O reacted completely in 7 min. yielding 60% (Me₂C:)₂ and unidentified material, b₄ 60-70°, which reacts with Na. 9,10-Phenanthrenedibromide and (EtO)₂PONa in Et₂O gave phenanthrene and (EtO)₂POH, and unidentified material, b₉₀ 110°, which on hydrolysis gave H₃PO₄. Dibromophenanthrene and (EtO)₃P gave phenanthrene and (EtO)₂POH. (EtO)₂PONa (from 26.6 g. ester) with 24.6 g. (CH₂OCH₂CH₂Br)₂ on 2 days standing gave 14.7% (CH₂OCH₂CH₂PO₃Et₂)₂, b₂ 228-9°, d₂₀²⁰ 1.1416, n_D²⁰ 1.4478, which with HCl hydrolyzed to an uncrystallizable free acid, which was analyzed as the Ba salt. (CH₂OCH₂CH₂Br)₂ with (EtO)₃P gave impure ester identical with that above but decomposing on distillation (EtO)₂PONa (from 33 g. ester) with 25.7 g. Br(CH₂)₄Br gave 61% (CH₂CH₂PO₃Et₂)₂, b₇ 214-17°, d₂₀²⁰ 1.1173, n_D²⁰ 1.4460, decompose on boiling; hydrolysis gave an uncrystallizable oil. (CH₂)₄Br₂ (10 g.) with 15.5 g. (EtO)₃P gave 58.4% above ester, b₈ 215-16°, d₂₀²⁰ 1.1176, n_D²⁰ 1.4495. (EtO)₂PONa (from 19.2 g. ester) with 30 g. 1-iodo-2-ethoxy-3-butene refluxed 1 h. in Et₂O gave 33.5% crude, or 17% pure, CH₂:CHCH(OEt)CH₂PO(OEt)₂, b₇ 119-20°, d₀⁰ 1.0409, n_D²⁰ 1.4231, and much polymerized undistillable matter; the same ester formed in 30% yield in a larger experiment The iodide with (EtO)₃P refluxed 2 h. yielded 30% same ester as above. (EtO)₂PONa with 1-chloro-2-ethoxy-3-butene gave NaCl and liquid material which decomposed extensively on attempted distillation and much polymeric matter; the chloride and (EtO)₃P gave much unreacted material and a little substance, b_4.5 124-6°, d₀⁰ 1.0592, n_D²⁰ 1.4495, containing 14-14.5% P. (EtO)₂PONa with 1-chloro-4-ethoxy-2-butene gave NaCl, unreacted halide, MePO(OEt)₂ (uncertain), and material, b₃ to 205°, which analyzed as C₅H₁₃O₃P to C₁₈H₄₁O₁₀P₃. 1-Chloro-4-ethoxy-2-butene with (EtO)₃P gave a little substance, b_4-6 136-42°, with much decomposition The nature of the products is unknown.

Uchenye Zapiski, Kazan. Gosudarst. Univ. im. V. I. Ul’yanova-Lenina 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, Recommanded Product: 2,3-Dibromo-2,3-dimethylbutane.

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

Booker-Milburn, Kevin I. published the artcileTandem ring expansion-cyclization reactions: a novel method for the rapid construction of the bicyclo[5.3.0]decane ring system, Recommanded Product: (4-Bromobut-1-yn-1-yl)trimethylsilane, the publication is Synlett (1992), 809-10, database is CAplus.

Treatment of the cyclopropyl silyl ether I with ferric chloride in DMF gave the 5,7-bicyclic chloro ketone II via a tandem free radical ring expansion-cyclization sequence. The acetylenic derivatives III (R = SiMe₃, CO₂Me) underwent the same expansion-cyclization sequence to yield similar 5,7-carbocycles.

Synlett 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, Recommanded Product: (4-Bromobut-1-yn-1-yl)trimethylsilane.

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

Cade, J. A. published the artcileMethylenediphosphonates and related compounds. I. Synthesis from methylene halides, Synthetic Route of 66197-72-6, the publication is Journal of the Chemical Society (1959), 2266-72, database is CAplus.

Two established methods for preparing Et methylenediphosphonates were extended to allyl systems, but with limited success. Only 1 method gave a product suitable for the preparation of resins for complex formation with metals. The yield of saturated alkyl esters was improved, and some new esters containing P were described. Diethyl chloromethylphosphonate (I) was prepared from the acid chloride, which was obtained from PCl₃ and paraformaldehyde. AlBr₃ (280 g.) and 272 g. PBr₃ treated portionwise with 500 cc. CH₂Br₂ with cooling, the mixture refluxed 2 hrs., the bulk of the CH₂Br₂ distilled, the residual sirup solidified, added in lumps to 1.2 l. CH₂Cl₂, at -20°, 160 cc. H₂O added dropwise, the precipitate collected, washed, the filtrate and washings distilled and degassed and the residue distilled gave pure bromomethylphosphonyl dibromide (II), b₇ 118-20°, n²⁰_D 1.512. Na (4.6 g.) in 100 cc. CH₂:CHCH₂OH treated at 0° with 32.4 g. diallyl phosphite, 26.8 g. CH₂I₂ added during 0.5 hr., the solution warmed 2 hrs. at 60°, the bulk of the alc. removed, the residual volatile matter removed at 60°/0.1 mm., the combined distillate and trap contents treated with H₂O, the insoluble material dried, and distilled gave 16 g. CH₂:CHCH₂I, b. 98-102°; S-thiuronium picrate, m. 154-6°, and 4.2 g. CH₂I₂, b₂₅ 79-82°, d²⁰ 3.32. The pasty residue (43 g.) washed with 1:1 Me₂CO-Et₂O and recrystallized gave 15 g. symmetrical di-Na diallyl methylenediphosphonate (III), m. 209-11° (MeOH-Et₂O). The washings treated with H₂O and the oil distilled gave 6.5 g. diallyl allylphosphonate (IV), b_0.5 75-8°, n²⁰_D 1.4614. Na diallyl phosphonate prepared as described above from 4.6 g. Na and 32.4 g. diallyl H phosphite in allyl alc., the dry product in 200 cc. PhMe distilled with removal of 100 cc. PhMe, the process repeated, the solution treated during 0.5 hr. at 0° with 17.5 g. CH₂Br₂ gave III. The process was unreliable. CH₂Cl₂ gave similar results, and addition of quinol also did not give reliable reactions. III (9 g.) refluxed 3 hrs. with 80 cc. constant boiling HBr, the mixture distilled 3.8 g. allyl bromide removed, the residual sirup treated with more acid and 4.9 g. NaBr removed, the filtrate evaporated, treated with 50 cc. alc., filtered, and evaporated gave 1.5 g. methylenediphosphonic acid, m. 201° (tert-BuOH). Et₃PO₄ (425 g.) and 311 g. CH₂I₂ were heated together under a column. At 148° a reaction set in and the temperature rose spontaneously to 200°; a liquid distilled and the temperature remained at 190-200° until distillation ceased. The residue on repeated distillation gave 263.6 g. diethyl ethylphosphonate (V), b_0.1 43-5°, n²⁰_D 1.4150, 56.3 g. diethyl iodomethylphosphonate (VI), b_0.2 90-100°, 81.2 g. tetraethyl methylenediphosphonate (VII), b_0.5 122-8°, n²⁰_D 1.4300, and mixed fractions and residues. The primary distillate was combined and after treatment with dilute HCl and drying gave 68.6 g. EtI, b. 70-3°, 18.9 g. mixed fraction, and 45.8 g. recovered CH₂I₂. Et₃PO₄ (183 g.) and 134 g. CH₂I₂ mixed at 185°, the rate of addition adjusted so that distillation occurred steadily and heating continued 10 min. gave products consisting of 128 g. EtI, 27.5 g. crude V, 82 g. crude VI, and 32.3 g. residue. The foregoing procedure with 83 g. Et₃PO₄ and 200 g. CH₂I₂ gave 74 g. EtI, 68 g. CH₂I₂, and 120 g. VI. The residue of 11 g. contained no iodine but pure VII was not obtained from it. Et₃PO₄ (33.2 g.) and 27.8 g. VI heated to 160° and finally to 180° (when liquid began to distil), and the temperature held 1 hr. at 195° gave a distillate containing 2 g. EtI contaminated with Et₃PO₄. The reaction mixture gave 4.6 g. forerun containing Et₃PO₄, 29.0 g. V, and 13.5 g. VI. Pure VII was not obtained from the residues. Et₃PO₄ (33.9 g.) added at 220° to 37.6 g. VI (the final temperature was 240°) gave a product containing 17.6 g. EtI and 23 g. VII; very little VI was recovered. Et₃PO₄ (40 g.) added in 1 hr. to 44 g. diethyl bromomethylphosphonate at 220-35° (as described above for VI) gave after the usual work up 14.5 g. EtBr, 19 g. V, and 263 g. VII. Et₃PO₄ (60 g.) added to 60 g. I at such a rate that the temperature never fell below 220° (14 hrs.) 4 g. crude EtCl collected in a trap, the mixture heated a further 2 hrs., and distilled afforded 36.1 g. V, and 40.8 g. of a residue which decomposed on further heating. Methylenediphosphonic acid was not obtained by hydrolysis of this residue. (CH₂:CHCH₂)₃PO₄ (VIII) (60.6 g.) and 26.8 g. CH₂I₂ heated as above with vigorous reaction beginning at 130° and the liquid distilled (after 2 hrs. heating at 170-85° distillation ceased) gave 14.2 g. CH₂:CHCH₂I, b. 98-102°, 7.5 g. CH₂I₂, 25.5 g. IV, 12 g. diallyl iodomethylphosphonate (IX), 4 g. tetraallyl methylenediphosphonate (X), various mixed fractions, and 18 g. residue. The maximum yield of X was 12%. In one experiment 8% IX was isolated. VIII (40.4 g.) and 81 g. CH₂I₂ gave 24.8 g. IX. The following compounds were prepared by the modified procedure (compound, % yield, b.p./mm., n_D, and d given): VIII, 90-2, 34°/0.06, 1.4589, 0.999; diallyl phosphite, 70-6, 40°/0.07, 1.4478, 1.087; IV, 82, 54°/0.08, 1.4622, 1.046; diallyl chloromethylphosphonate, 60, 83°/0.15, 1.4665, 1.175; diallyl bromomethylphosphonate, 72, 76°/0.1, 1.4842, 1.373; IX, 8(41), 102°/0.1, 1.5015, 1.552; X, 12, 142°/0.1, 1.4675, 1.132; diethyl bromomethylphosphonate, 82, 121°/15, 1.4595, 1.432; tetrabutyl methylenediphosphonate, 45, 150-5°/5 × 10^-4, 1.4455, 1.041; tetrabutyl ethylenediphosphonate, 51, 175-8°/5 × 10^-4, 1.4484, 1.035.

Journal of the Chemical Society published new progress about 66197-72-6. 66197-72-6 belongs to bromides-buliding-blocks, auxiliary class Aliphatic Chain, name is Diethyl (bromomethyl)phosphonate, and the molecular formula is C5H12BrO3P, Synthetic Route of 66197-72-6.

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

Cal, Dariusz published the artcileA convenient synthesis of ω-hydrazinoalkylphosphonic acids, Recommanded Product: Diethyl (bromomethyl)phosphonate, the publication is Tetrahedron Letters (2016), 57(1), 126-128, database is CAplus.

A simple, efficient, and cost effective method has been developed for the synthesis of ω-hydrazinoalkylphosphonic acids via the nucleophilic substitution reaction of di-Et ω-haloalkylphosphonates and hydrazine using mild reaction conditions, followed by hydrolysis with hydrochloric acid.

Tetrahedron Letters published new progress about 66197-72-6. 66197-72-6 belongs to bromides-buliding-blocks, auxiliary class Aliphatic Chain, name is Diethyl (bromomethyl)phosphonate, and the molecular formula is C5H12BrO3P, Recommanded Product: Diethyl (bromomethyl)phosphonate.

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

Ponomarev, I. I. published the artcileSynthesis of N-(2-hydroxyphenyl)-1,8-naphthalimide and its derivatization at the hydroxy group, Product Details of C3H6BrNaO3S, the publication is Russian Chemical Bulletin (2011), 60(3), 512-520, database is CAplus.

The reaction of 1,8-naphthalic anhydride with 2-aminophenol afforded N-(2-hydroxyphenyl)-1,8-naphthalimide. N-(2-hydroxyphenyl)-1,8-naphthalimide was alkylated at the hydroxyl group and then subjected to [2+3]-cycloaddition with azides to afford 1,2,3-triazoles, e.g., I.

Russian Chemical Bulletin published new progress about 55788-44-8. 55788-44-8 belongs to bromides-buliding-blocks, auxiliary class Bromide,Salt,Aliphatic hydrocarbon chain,Aliphatic hydrocarbon chain, name is Sodium 3-bromopropane-1-sulfonate, and the molecular formula is C3H6BrNaO3S, Product Details of C3H6BrNaO3S.

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

Sergienko, S. R. published the artcileTransformations of diene compounds in the presence of oxide catalysts. Transformations of 2,3-dimethyl-1,3-butadiene on aluminosilicate, Safety of 2,3-Dibromo-2,3-dimethylbutane, the publication is Doklady Akademii Nauk SSSR (1953), 803-6, database is CAplus.

cf. C.A. 48, 11290g. Passage of 2,3-dimethyl-1,3-butadiene over pelleted aluminosilicate at 250° (at 200° little reaction takes place, while above 250° much decomposition occurs) gave 7-10% C₅-hydrocarbons and 35-40% dimeric products, the remainder being trimers and higher condensation products. The identified products were 2,3-dimethyl-2-butene, 2,3-dimethylbutane, apparently cyclic dimers, b. 187-95°, and higher products. The fresh catalyst is gradually coated not with C but with a hydrocarbon C_nH_2n-18, a resinous solid, the composition of which was between a pentamer and a hexamer of the diene.

Doklady Akademii Nauk SSSR 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 C3H8N2S, Safety of 2,3-Dibromo-2,3-dimethylbutane.

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