Phosphonium salts cyclopropylphosphonium

Cyclopropylphosphonium salts are produced, together with the phosphonium salts (76), in reactions of ylides with vinylsulphonium salts... 

Vinylsulphonium salts and ylides gave cyclopropylphosphonium salts (95) via proton transfer in the initial adducts (94). C-Methylation of the ylides also occurred with dimethylvinylsulphonium salts, whereas the ylides (93 R = H, COPh, or /7-N08 CeHi) gave only the corresponding phosphonium salts. 

This A -phosphane has been developed as a suitable building block in organic chemistry (see Section 5.13.1.). However, some higher homologues of the cyclopropylphosphonium salts have been synthesized. (3-Bromo-2-methylpropyl)triphenylphosphonium bromide was similarly converted into (2-methylcyclopropyl)phosphonium bromide upon reaction with sodium ethoxide in ethanol. ... 

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