Normally, using a Grignard or lithium synthesis, it is possible to substitute halo- and alkoxy-silanes with organic groups (R). Usually a mixture of variously substituted silanes is obtained and it appears that the Grignard synthesis of organo- halosilanes can be treated as a series of successive reactions of the type AX,+RY - AX,R,+rixy'. The lithium synthesis is considered to be very similar to that of the Grignard reaction, though the higher reactivity of the organolithium reagent, which ...