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A New Class of Singlet Carbene Ligands
Author(s) -
Alcarazo Manuel,
Suárez Rosa M.,
Goddard Richard,
Fürstner Alois
Publication year - 2010
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201001779
Subject(s) - carbene , singlet state , deprotonation , chemistry , phosphonium , lone pair , photochemistry , stereochemistry , combinatorial chemistry , polymer chemistry , organic chemistry , molecule , catalysis , ion , physics , excited state , nuclear physics
What are you? Deprotonation of fluorenylidene phosphonium salts generates reactive intermediates that can be described as push–pull cumulenes or singlet carbenes (see scheme). Whereas the NMR data are ambiguous, the coordination behavior shows the ready availability of a lone pair at the central C atom. The donor ability of singlet carbene ligands of this new class exceeds that of the commonly used N‐heterocyclic carbenes (NHCs).