SCHEDULED MAINTENANCE
Polyfunctional and stereochemically pure (E) or (Z) alkenylcopper reagents have been generated by carbocupration of terminal alkynes or by an iodine–lithium exchange reaction and have been found to add to various diethyl alkylidenemalonates, affording γ,δ-unsaturated esters in excellent yields.
G. Cahiez, P. Venegas, C. E. Tucker, T. N. Majid and P. Knochel, J. Chem. Soc., Chem. Commun., 1992, 1406 DOI: 10.1039/C39920001406
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