Quantitatively and in one step, the heterocumulenes OCCCO and Ph3 PCCO form spirobis(cyclobutanedione) A in a double [2 + 2]cyclo-addition. The bis(ylidic) structure was confirmed by spectroscopy and X-ray crystallography
Heterocumulenes: reactions of c3o2 with ketenylidenetriphenylphosphorane; synthesis and structure of a spiro bis(cyclobutadnedione)
PANDOLFO, LUCIANO;BERTANI, ROBERTA;
1996
Abstract
Quantitatively and in one step, the heterocumulenes OCCCO and Ph3 PCCO form spirobis(cyclobutanedione) A in a double [2 + 2]cyclo-addition. The bis(ylidic) structure was confirmed by spectroscopy and X-ray crystallography
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