PbCl2 in tetrahydrofuran; diethyl ether Ti-complex was mixed with Li-salt in THF, refluxed for 1 h, other Li-salt in Et2O was added, Et2O was distilled off, refluxed for 24 h, vol. wasreduced, PbCl2 was added under Ar, stirred for 2 h at 40°C under Ar; volatiles were evapd. under vac., extd. with hexane, crystd. from hexane;

PbCl2 in tetrahydrofuran; diethyl ether Ti-complex was mixed with Li-salt in THF, refluxed for 1 h, other Li-salt in Et2O was added, Et2O was distilled off, refluxed for 24 h, vol. wasreduced, PbCl2 was added under Ar, stirred for 2 h at 40°C under Ar; volatiles were evapd. under vac., extd. with hexane, crystd. from hexane;