Hjg. Luttikhedde et al., SYNTHESIS AND MOLECULAR-STRUCTURE OF METHYLENEBIS(4,5,6,7-TETRAHYDRO-1-INDENYL)TITANIUM DICHLORIDE, Journal of organometallic chemistry, 547(1), 1997, pp. 129-132
The reaction of indenylpotassium with 0.5 equiv. of chloromethylpivala
te yields bis(3-indenyl)methane (1). Double deprotonation of 1 with tw
o equiv of BuLi, reaction with TiCl4 . 2THF and subsequent hydrogenati
on yields rac-methylenebis(4,5,6,7-tetrahydro-1-indenyl) titanium dich
loride (3) in 16% overall yield. The molecular structure of (3) reveal
s a very small acute angle of 98.9(2)degrees at the methylene bridge c
arbon atom. (C) 1997 Elsevier Science S.A.