Show the reagents for the transformation below (see image). It must be done in only five steps.
My thoughts: What I did was add hexavalent Cr to oxidize the alcohol, which turned it into a secondary ketone, to that I added a grignard (phenyl-magnesium-bromide), which gave me 2-phenyl-2-butanol (I know that probably isn't that IUPAC name). I am stuck when I get to this point because I know that I cannot oxidize a tertiary alcohol, which I have created. If someone could point me in the right direction, I would really appreciate it. Thank you!