@hmx9123: Thank you, I'll give it a read out of general interest if you turn it up.
@kiwi and the discussion in general: Yep, I'm familiar with NOE. In fact I can see all my quaternary carbons. In the current example I am looking at 1-methyl-3-phenyloxindole and its derivatives and because of really nasty overlap in the aromatic region of the 1H spectrum it is hard to get much information out of the HMQC, which means I don't know which of the tertiary carbons I am missing. I lean towards the 4'-aromatic (overlapping the 2',6' or 3',5' signal), since I have a full account of carbons in 1,3-dimethyloxindole.