| abstract |
NEW MATERIAL:A compound of formula I (X is O, S, methylene or NSO 2 CF 3 ; M is SnRR', TiRR', ZrRR', AlR or Zn; R and R' are each lower alkyl, lower alkoxy, phenyl or halogen; when X is O, M, is SnRR', ZrRR' or Zn, and when X is methylene, R and R' are each halogen). n EXAMPLE: N,N'-(S)-2,2'-ditrifluoromethanesulfonamide-1,1'-binaphthyl diphenylstannane. n USE: An optically active Lewis acid catalyst. Applicable to the asymmetric hydrostannation reactions for simple ketones, asymmetric C-C bond reactions and polymer syntheses. n PREPARATION: The objective compound of the formula I (where, X is X') can be obtained by reaction of (A) an optically active binaphthyl compound of formula II (X' is O, S or NSO 2 CF 3 ) with (B) a metal complex of formula M(R") 2 [R" is lower alkyl, lower alkoxy, halogen or O as the entire (R") 2 ]. n COPYRIGHT: (C)1992,JPO&Japio |