1-tert-butyl-4,4,4-tris(dimethylamino)-2,2-bis[tris(dimethylamino)-phosphoranylidenamino]-2Λ54Λ5-catenadi(phosphazene) in tetrahydrofuran T=-95°C; 1 h; Yields of byproduct given;

copper(l) iodide; boron trifluoride diethyl etherate 1.) ether, -20 deg C, 20 min, 2.a) -78 deg C, 1 h up to -40 deg C, 1 h, b) 6 h; Yield given. Multistep reaction;