| 摘要 |
Compositions which comprise a complex of: (a) a titanium-containing material having the formula <IMAGE> in which X1 is cyclopentadienyl, chlorine, bromine or C1-C6 alkoxy, X2 and X3 are chlorine, bromine, or C1-C6 alkoxy; Y1 and Y2 are chlorine or bromine; and z is hydrogen (preferably) or C1-C10 hydrocarbyl are novel reagents for methylenation or analogous reactions with a carbonyl group; and (b) a complexing agent selected from the group consisting of: (i) ethers having the formula R1OR2 in which R1 and R2 are C1-C4 alkyl; (ii) cyclic ethers having the formula <IMAGE> in which n is an integer from 4 to 7; and (iii) tertiary amines.
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