Oeps, forgot to tell:
Cp = cyclopentadienide
Yup Rhodium, the Wittig would probably be better. The starting product for the Tebbe reaction are rather peculiar, one needs to prepare MeLi, and the reaction is normally done in toluene-THF containing a small amount of
pyridine (which I guess is watched). I don't know about it, but I think the Cp
2TiCl
2 would not exactly be cheap.
A method to form the Tebbe reagent in situ can be found at J. Org. Chem. (1985) vol 50 p 2386. Mabey I 'll check it out once - as a chemistry curiosity -, but it's not on my priority list right now.
So many things to do, so little time.