Reactions of C-Chlorinated Carbosilanes with Silylphosphanes

1 Formation and Reactions of the Ylide (C l3Si)2CPMe2Cl and the Effect of Substituents on Ylide Formation 

Cl3Si—CCI2—SiCl3— Me3Si — a35i-C-7-SiCl3 L Cl k.  

Crystal structure analysis confirms the ylidic form of 325 and shows that both C—P and C—Si bonds are notably shortened [132]. Compound 325 also is formed from (Cl3Si)2CCl2 on cleavage of 

The formation of the ylide 325 is favored through Si-chlorination. In the reaction of (Me2ClSi)2CCl2 with Me3Si—PMe2 or LiPMe2 in a lesser mole ratio (0.05 to 

2 mole), the yield of (Me2ClSi)2CPMe2Cl could be determined by NMR spectroscopy to be only 1 %, while C- and Si-substitution represented the major part of the reaction. The (Me3Si)2CCl2 reacts with Me3Si—PMe via C-phosphorylation 

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