As I look at this problem, it appears as though PhCHOHCH2CH2CH3 was the precursor to the ketone. This looks like a Grignard addition to an aldehyde.
If I get the aldehyde and then I add CH3CH2CH2MgBr, won't it give me the alcohol, but not the ketone?
Edit: oh, fml, then I oxidate it with any strong oxidant like Ag2O,H2O or KMnO4 and I get the product aswell.
Anyway, I think (don't really know why, lol) the acid chloride reacting with Gilman reactant, (CH3CH2CH2)2CuLi will give better results...