Murakami, Yukito published the artcileHydrophobic vitamin B12. XI. Preparation, characterization, and enantioselective alkylation of hydrophobic vitamin B12 bearing a binaphthyl moiety, SDS of cas: 56970-78-6, the publication is Bulletin of the Chemical Society of Japan (1992), 65(11), 3094-102, database is CAplus.
Hydrophobic vitamin B12 derivatives bearing a chiral binaphthyl moiety, hexamethyl 71-decarboxy-71-[(R)-2′-methoxy-1,1′-binaphthyl-2-carboxymethyl]cobyrinate perchlorate [B12-BINAP(R)] and hexamethyl 71-decarboxy-71-[(S)-2′-methoxy-1,1′-binaphthyl-2-carboxymethyl]cobyrinate perchlorate [B12-BINAP(S)], were prepared from cyanocobalamin. These complexes were characterized by means of electronic and CD spectroscopy as well as by cyclic voltammetry in comparison with those data for a hydrophobic vitamin B12 without a binaphthyl moiety. The enantioselective alkylation of hydrophobic vitamin B12 derivatives at the β-axial site was examined in methanol with various 3-bromo-2-methylpropionic esters by means of 1H NMR spectroscopy. B12-BINAP(R), and B12-BINAP(S) bound (S)-2-methylpropionates more favorably than (R)-2-methylpropionates. The cause of such S-enantioselectivity was discussed with attention to stereochem. configurations of the peripheral substituents placed in the corrin ring.
Bulletin of the Chemical Society of Japan published new progress about 56970-78-6. 56970-78-6 belongs to bromides-buliding-blocks, auxiliary class Bromide,Carboxylic acid,Aliphatic hydrocarbon chain,Inhibitor, name is 3-Bromo-2-methylpropanoic acid, and the molecular formula is C4H7BrO2, SDS of cas: 56970-78-6.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary