in diethyl ether 1 h;

in tetrahydrofuran under Ar, addn. of TiCl4 to a THF soln. at 0°C, dropwise addn. of (C5H4CMe3)Li in THF, allowed to warm to room temp., stirred for 2 h; addn. of heptane, pptn. filtered off in air, recrystn. (CHCl3);

in diethyl ether byproducts: LiCl; under Ar, to lithium t-butylcyclopentadienide in diethyl ether was added at room temp. the InCl powder ; stirred for 19 h in the dark; ether removed by vac. distn.; elem. anal.;

in tetrahydrofuran dropwise addition of cold soln. of CpLi to complex in THF at 0°C, stirred for 0.5 h, inert atm.; evapn. in vac., washing with heptane, sublimation (200-250°C, 6E-4 torr); elem. anal.;

in acetonitrile addition of CpSnBu3 in acetonitrile to NbCl4 at 0°C, stirred for3 h, evapn., dissolving in THF, CpLi addition, stirred for 0.5 h, inertatm.; evapn. in vac., washing with heptane, sublimation (200-250°C, 6E-4 torr); elem. anal.;

(i) <Et3O>BF4, (ii) /BRN= 6300487/; Multistep reaction;