Pentaalkylstiboranes and Related Compounds

In no case, however, not even at temperatures as low —100 to —120 °C, could any splitting of the alkyl NMR-signals be observed for pentamethylstiborane 170) and other pentaalkylstiboranes166) which would have been indicative of different bonding sites for the alkyl groups. 

The chemistry of pentaalkylstiboranes171) is closely related to that of pentaphenyl-and other pentaarylstiboranes. With strong nucleophiles various exchange reactions 

Decomposition of pentabutylstiborane in tetrachloromethane evidently follows a radical reaction sequence164 analogous to that proposed for pentaphenyl-stiborane 144). 

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