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Wednesday, March 26, 2014

Reactive Phosphorus Intermediates

Gomberg Inorganic Lecture
1640 Chemistry
4:00 PM - 5:30 PM

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Contact:   nszym@umich.edu
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Speaker:   Christopher C. Cummins, Massachusetts Institute of Technology
Talk:   Reactive Phosphorus Intermediates
Abstract:   We are developing approaches to phosphorus group transfer reactions, approaches that are predicated on the notion of the involvement of certain reactive phosphorus intermediates. As one example, phosphinidene groups (P-R, phosphorus analog of a carbene) may be transferred to olefins or 1,3-dienes with free singlet phosphinidenes as the key proposed intermediate. By application of Occam's razor we conclude that P2, a homonuclear diatomic that is unsaturated with two P-P pi bonds, may be a common intermediate among various diphosphorus transfer reactions. Synthetic and structural considerations will be discussed, as will the prospects for future direct detection of some intermediates derived from thermal activation of molecular precursors.