Tetraphenylzirkonacyclopentadien-Derivate als Synthone fuer Tetraphenylthiophenmonoxid und substituierte Germanole

Article abstract of DOI:10.1016/0022-328X(93)80324-5

Improved syntheses for the five-membered heterocycles 2,3,4,5-tetraphenylthiophene-1-monoxide (1), 1,1-dichloro-2,3,4,5-tetraphenylgermole (3) and 1,1-dimethyl-2,3,4,5-tetraphenylgermole (4) are reported.They make use of bis(η⁵-cyclopentadienyl)-2,3,4,5-tetraphenyl-1-zirconacyclopentadiene (2), easily prepared in a one-step reaction from Cp2ZrCl2, n-BuLi and diphenylethyne.Further reaction of 2 with SOCl2, GeCl4 or Me2GeCl2 yields the desired products and allows recovery of Cp2ZrCl2.Crystal structure analyses of 1 and 4 demonstrate folded five-membered rings with a diene system.Starting from 3 the following derivatives have been synthesized: Ph4C4Ge(C<*>CR)2 (R = H, t-Bu, Ph), Ph4C4GeCl (10) and Ph4C4GeCl.Moreover spectral data (IR, 1H NMR, 13C NMR) of all compounds and the crystal structure of 10 are reported.