P-Rich Silylphosphanes; Synthesis and Reactions

Abstract

The availability of the phosphanortricyclenes P₇(SiMe₃)₃, P₄(SiMe₂)₃ [l], P₇R₃ (R = alkyl), their complexchemical properties [2], the formation of Li₃P₇ and other Li- phosphides by the lithiation of (Me₃Si)₂P-P(SiMe₃)₂ in ether solution [3] are the causes for the increased interest in P-rich silylphosphanes and lead to the develop-ment of new methods for the synthesis of P- functional tri- and tetraphosphanes [4], in which certain P-atoms bear reactive groups (SiMej,H,Li), while others are blocked by alkyl-groups. Since the formation of transition-metal-complexes reflects, aside of sterical factors, the electronic system of the ligand, it appears to be important, in order to understand the chemistry of P-rich silylphosphanes, to examine their complexing properties. That's why different aspects of the chemistry of P-rich, silylated compounds are surveyed simultaneously.