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Variable Reactivity of a N-Heterocyclic Phosphenium Complex: P-C Bond Activation or "Abnormal" Deprotonation
Michael Gediga1, Simon H Schlindwein1, Johannes Bender1
1Institut für Anorganische Chemie, University of Stuttgart, Pfaffenwaldring 55, 70550, Stuttgart, Germany.
Abstract:
The reaction of an N-heterocyclic phosphenium complex of manganese with MeLi/Et3 NHCl under formal addition of CH4 to the Mn=P double bond can be reversed upon UV photolysis, providing a rare example for selective P-C(alkyl) bond activation. Action of LDA on the phosphenium complex does not proceed via attack at phosphorus but rather via C4-deprotonation to yield a unique P-analogue of an "abnormal" carbene. A transmetalation product of the original complex was fully characterized. The C-metalation is also applicable to bis-phosphenium complexes of other metals.
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