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The ruthenium catalyst RuCl(NO)(PPh 3 ) 2 is shown to be an active catalyst for the methylenation of aldehydes in the presence of (trimethylsilyl)diazomethane, triphenylphosphine, and 2-propanol. Spectroscopic investigations have revealed the unusual formation of an octahedral η 2 (C,N)-coordinated (trimethylsilyl)diazomethane ruthenium complex that, upon treatment with triphenylphosphine and 2-propanol, produces methylenetriphenylphosphorane.
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Lebel et al. (2004) studied this question.
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