How to synthesize t-Boc protected derivative of PVA
Interesting, and i like the part with the photoacid.

I can't read the full details of the cited article (paywall), but since the authors aren't very pleased with the functionalization of the PVA, how about a change in the order of events:




prepare or buy the monomer (vinyl tBOC)
polymerize it according to this article (or a better source)