Poking around a bit, I found that you can do an oxidative coupling of methane groups (and with the toluene methyl groups) with Bi
2O
3, but I don't know if you're supposed to know that lol.
2 * Toluene --Bi
2O
3, 580*--> PhCH=CHPh --1) O
3, 2) Me
2S--> 2 * PhCHO
Reference:
Seriya Khimicheskaya 1975,
10, 2378
Edit: I don't know if that's 580*C or *F, I don't have access to that journal, just the abstract. I'm sure a delta symbol should suffice
.