Abstract
The synthesis and isolation of a bismuth‐based analogue of the venerable triphenylphosphine oxide (Ph3PO) has remained a chimera to synthetic chemists for many years, due to its predicted high reactivity and instability. Through the hydrolysis of a cationic fluorotriarylbismuthonium(V) salt, we report here the isolation of unique hydroxytriarylbismuth(V) complexes, which served as precursor for the formation of the elusive monomeric triarylbismuthine oxide Dipp3Bi═O. Combined spectroscopic, crystallographic and computational studies provided insight into the bonding situation of the first monomeric triorganobismuth oxide complex. The Dipp3Bi═O and Mes3BiO·LiBArF complex exhibits O‐atom transfer reactivity, an uncommon reactivity feature for Ar3Pn=O.
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