High Prity BINOL 99% 1,1'-Bi-2-naphthol CAS 602-09-5
[1,1'-binaphthalene]-2,2'-diol; 1,1'-bi-2-naphthol; 1,1-binaphthol; BINOL
Raw material for chiral BINOL or BINAP.
BINOL CAS:602-09-5 could be converted to optical pure R-BINOL or S-BINOL through resolution. Currently, producing larger quantity of both enantiomers through resolution is more economic and effective way. Previously reported resolutions include: 1) making a cyclic phosphate of binaphthol, then resolution and subsequent reduction to release the pure binaphthol; 2) using enzymatic hydrolysis of the diester of binaphthol; and 3) forming inclusion complexes with suitable compounds. The use of N-benzylcinchonidinium chlorideto make inclusion complexes was reported by Tanaka and co-workers for obtaining one enantiomer of binaphthol.Using acetonitrileas solvent, in which the inclusion complex has very low solubility, allows for the isolation of both enantiomers with high enantiomeric excess. This simple and efficient procedure represents a much better resolution for 1,1'-bi-2-naphthol.
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