Worth diene for: The butadienylphosphine L (see scheme), obtained on a large scale from a new synthetic method, is an efficient ligand in Ullmann-type copper-catalyzed arylation reactions. The use of this phosphorus ligand made it possible to follow the reaction by 31P NMR spectroscopy and thus to propose a mechanism for the Ullmann reaction.
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Kaddouri et al. (2008) studied this question.
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