Chloromethylsilane functionalised dendrimers: synthesis and reactivity

Tetraallylsilane was functionalised using (chloromethyl)dimethylsilane to give the first generation chloromethyl terminated dendrimer 1. The resulting dendrimer was successfully reacted with K[CpM(CO)2] (Cp=η5-C5H5; M=Fe, Ru) to give Si[(CH2)3SiMe2CH2MCp(CO)2]4 functionalised dendrimers in satisfactory yield. Reaction of dendrimer 1 with NaI in acetone gave the –SiMe2CH2I functionalised dendrimer, while reactions of 1 with K[CpM(CO)3] (M=Mo, W, Re), Li[C5Me4H], Na[C5Me4H], the cobaloxime nucleophile or tert-BuLi were not successful.