87284-68-2Relevant academic research and scientific papers
Alkenylbis(η5-cyclopentadienyl)titanium Compounds: Investigations Concerning the Complexation of C=C-Bonds to Ti
Lehmkuhl, Herbert,Tsien, Yen-Lung,Janssen, Edo,Mynott, Richard
, p. 2426 - 2436 (2007/10/02)
The 4-alkenylbis(η5-cyclopentadienyl)titanium(IV) chlorides 2 - 4 and 20 - 23 have been prepared from Cp2TiCl2 (1) and the appropriate organomagnesium halides. 1H and 13C NMR investigations indicate that in these compounds as well as in the 1:1 complexes 5 - 7 and 24 formed with ethylaluminium dichloride the C=C-bond of the alkenyl group is not complexed to the Ti. ω-Alkenyl complexes of TiIII of the type Cp2TiCH2nCH=CH2 (n = 0-11) isomerize between 0 and 20 deg C through a βH-elimination mechanism to give the η3-allylbis(η5-cyclopentadienyl)titanium(III ) compounds 9-15.In the titanium(III) complexes 18 and 19 the βH-elimination process is more difficult.In 18 the C=C valence stretching frequency is shifted to longer wave length to 1510 cm-1.This is interpreted by η2-interaction of the C=C bond with titanium.
