“…'V2 We describe here the vibrational spectra of various isotopomers of DiMe(cp)C12] and FiEt(cp)Cl,] (cp q5-CsH,): these two compounds illustrate the utility of partial deutenation studies, and also some of their limitations, and are important in their own right given the current interest in alkyltitanium systems. [3][4][5][6][7][8][9][10][11][12][13][14][15][16] Experimental piR(cp)Cl,J (R = Me or Et).-These compounds were prepared using an adaptation of the method of Erskine et 7 Non-SI unit employed: dyn = lo-' N. 8 The compound Fi(cp)Cl,] was obtained from the reaction of [Ti(cp),Cl,] with TiCl, in refluxing toluene. l 9 Dialkylzinc compounds were prepared from the direct reactions of CH,I, CD,I, CHD,I, CH,CD,Br, CD,CH,Br and CHD,CD,I with copper-activated zinc.…”