Pentaorganoarsenic compounds

Various alkyl and aryl substituted pentaorganoarsenic compounds are known - . Most of these have been synthesized by transmetallation from Grignard reagents or organo-lithium reagents to arsenic centers. 

Symmetrical pentaorganoarsenic compounds have been synthesized from triorgano-arsenic halides R3ASX2 and tetraorganoarsenic halides R4ASX as shown in equations 284 and 285 . Tosylimine derivatives such as 37 have also been used for the preparation of pentaorganoarsenic compounds (equation 286 ). 

Pentaorganoarsenic compounds react with electrophiles such as HX and RX as shown in equations 293 and 294 . ... 

Protonolysis of pentaorganoarsenic compounds gives tetraorganoarsenic alkoxides as shown in equations 35and 352 . ... 

Reductive elimination from pentaorganoarsenic(V) compounds affords triorgano-arsenic(III) compounds (equation 59) . 

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