The Reaction with CH

1) linear carbosilanes with two terminal SiH3 groups, Si C H (n = 4-12) 

2) linear carbosilanes with one terminal SiH3 and one terminal Me group, Si C H4 2 

3) Cyclic carbosilanes with a side chain on a ring Si atom. 

Previously, Muller and coworkers [49] studied the reaction of Si and CHCI3. They were able to isolate and identify a number of low molecular weight products which 

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It is quite remarkable that in most cases CH-acids are added without either primary transformation into enolate forms or even the addition of a base capable of in situ deprotonation. The reaction with CH-acids without prior deprotonation was described for non-aqueous media for the palladium-catalyzed allylation with allyltin derivatives [69], though the mechanism proposed is quite specific and requires the presence of an organotin compound. By adjusting this mechanism to the reaction in water, the process shown in Scheme 5.5 may be considered. 

Answer The reaction with CH Br is faster, indicating that the bromide ion is the better leaving group. 

The reactivity of 2-chloro- trifluoromethyl pyridines depends on the position of the CFj substituent. For example, the reaction with "CH(C02Et)2 ions fails with the C3- and C4-substituted derivative, while substitution is obtained with the CF3 group at C5 or C6 with -CMe(C02Et)2 ions (100 and 44% yields,... 

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