... d,/3 -unsaturated ketone (1) with Ne2CuLi 3 in ether solution at -25'C followed by quenching of the intermediate enolate (21 w.ith a ... vol. ... T. Tanaka, S. Kurozumi, T. Toru, M. Kobayashi, S. Miura, and S. Ishimoto, Tetrahedron Letters, 1975, 1535; T. Tanaka, S. Kurozumi, T. Toru, M ...