Starting with p-trimethylsilyltoluene,the methyl group was brominated with N-bromosuc-cinimide into bromomethyl group and thence p-trimethylsilylbenzyl-substituted acetoacetic ester,malonic ester and nitrile were prepared. The bromomethyl get up was successfully converted into aldehyde group by means of Sommlet reaction.After the methyl group in p-trimethylsilyltoluene was oxidized into carboxyl group,the amide was prepared through the action of thionyl chloride and ammonia. Similarly, some esters and amides of p-triphenylsilylbenzoic acid,dimethyldi(p-carboxylphenyl) and diphenyldi(p-carboxyl) silane were synthesized. No cleavage of the carbon-silicon bond was found during the thionyl chloride treatment.