Acknowledgment. Financial support from CONICIT (Venezuela) and the Fonds der Chemischen Industrie is gratefully acknowledged. We thank V. León and J. Espidel (IVIC) for some NMR measurements, and CEPET for a Graduate Fellowship (to A.A.).
Addition of ethyl diazoacetate t o a mixture of styrene and norbornene containing a catalytic amount of Ru*(OAC)~ promoted both the cyclopropanation and a selective cross-metathesis of the alkenes.Scheme 1( 5 1 , n = 1 . 2
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