Molecular Hydrogen‐Induced Carbon Chain Rearrangement in Cyclopentadienyl‐Tethered Titanium(III) Permethyltitanocene Complexes

Abstract

Dihydrogen added at atmospheric pressure and ambient temperature to cyclopentadienyl-tethered titanium(III) permethyltitanocene complexes induced the rearrangement of their tether [-CH 2 -C(Me)=C(R)-Ti], moving the double bond to the lateral position [-CH 2 -C(=CHR)-CH 2 -Ti]. The methyl substituent on the -carbon from the cyclopentadienyl ring is converted to methylene group binding the rearranged tether to titanium. Subsequent hydrogenation of compounds with [a] J. 128Scheme 4. Rearrangement of 2b to 3b and partial hydrogenation of the latter to 4b and rearrangement of 2c followed by hydrogenation to 4c (solvent hexane, room temperature).