Arsenide anions alkylation

This method has also been quite useful for the synthesis of triorganoarsenic compounds. Arsenide anions, which can be prepared by several methods (vide infra), react with alkyl and aryl halides. Several examples are shown in equations 18 , 19 , 20 °, 21 , 22 23 , 24 and 25 . In the reaction with alkyl halides inversion of configuration at the sp carbon atom takes place and in the reaction of vinyl halides retention of configuration has been observed (equations 18 and 21). Photostimulated reaction with aryl halides has been reported to proceed via the Sjj l mechanism thus, the ketone group is compatible with the reaction conditions as shown in equation 23 . 

Alkylation of arsenide anions derived from primary arsines... 

Primary arsines give arsenide anions which react with alkyl halides to afford secondary arsines (equation 119) . 

This method has also been quite useful for the synthesis of triorganoarsenic compounds. Arsenide anions, which can be prepared by several methods vide infra), react with alkyl and aryl halides. Several examples are shown in equations 18" , 19", 20 , 21 22, ... 

Much less is known about the structures of the alkyls of heavier alkali metals. That of methylsodium is based on (MeNa) tetramers. MeM(M=K, Rb, Cs), however, possess ionic nickel arsenide structures with isolated methyl anions. 

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