Silylenes Arduengo-type

As mentioned above, the cyclic silylenes 75c and also 76c (or 79a and 79b) are dramatically less reactive than other known silylenes which are all transients. Thus, 75c has such a low Lewis acidity that, unlike other silylenes, it does not react as an electrophile. However, 75c reacts as a Lewis base, i.e. as a nucleophilic reagent980. The known reactions of Arduengo-type silylenes are summarized in References 2e, 98c, 98d and 99b and the references cited therein. The theoretical study of the possible reactions of Arduengo-type silylenes is quite limited and awaits the attention of computational chemists. 

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