The asymmetric codimerization of cyclohexa-1,3-diene with ethylene is catalysed by the Ni(cyclo-octa-1,5-diene)2–AlEt2Cl–L system where L are chiral aminophosphines; optimization of this catalytic system (–70°C; L/Ni = 10) gives (+)-(S)-3-vinylcyclohexene with 73·5% optical purity in 87% chemical yield when (–)-(R)-N-methyl-N-(1-phenylethylamino)diphenyl-phosphine is used.
G. Buono, G. Peiffer, A. Mortreux and F. Petit, J. Chem. Soc., Chem. Commun., 1980, 937 DOI: 10.1039/C39800000937
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