(Bu3Sn)2Cu(CN)Li2 in tetrahydrofuran T=-10°C; 12 h;

1.1: n-BuLi / hexane; diethyl ether / 0.5 h / -78 °C 1.2: 39 percent / diethyl ether; hexane / 2 h / -78 °C 2.1: 89 percent / barium manganate / CH2Cl2 / 1 h / 20 °C View Scheme

Acylation; Friedel-Crafts reaction;