Process for preparing 2,2'-bis(diphenylphosphinylmethyl)-1,1'-bi

Details Process for preparing 2,2'-bis(diphenylphosphinylmethyl)-1,1'-bi Process for preparing 2,2'-bis(diphenylphosphinylmethyl)-1,1'-bi

1997-03-27

1998-06-16

Glass, Margaret W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus containing

568 17, C07F 950

Patent

active

057673179

ABSTRACT:
The present invention relates to a process for preparing 2,2'-bis(diphenylphosphinylmethyl)-1,1'-binaphthyls by reacting a reaction mixture prepared in a solvent by reaction of 2,2'-dimethyl-1,1'-binaphthyl with a brominating agent to produce a mixture comprising 2,2'-bis(bromomethyl)-1,1'-binaphthyl and further brominated binaphthyls and optionally further comprising unreacted brominating agent, reacted brominating agent and solvent, with an alkyl diphenylphosphinite of the formula RO--P(Ph--(R').sub.n).sub.2, where R is an alkyl radical having from 1 to 5 carbon atoms, Ph is phenyl, R' is an alkyl radical having from 1 to 4 carbon atoms, CF.sub.3, fluorine, chlorine or bromine and n is 0, 1 or 2, at from 70.degree. to 180.degree. C. optionally in the presence of a further solvent.

REFERENCES:
Chemical Abstract, No. 91764v, vol. 91, 1979.
Tamao, et al., "Optimally Active 2,2'-Bis(Diphenylphosphinomethyl)-1,1'Binaphthyl: . . . ". Tetrahedron Letters No. 16 pp. 1389-1392, 1977.
European Search Report No. 95103403.2, Jun. 20, 1995.
Tetrahedron Lett. pp. 1889-92, Kyoto Univ. Dep. Synth. Chem, Kyoto, Japan.

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