Patent ID: 7825257

Claim:
A method of preparing a monomer of formula (E): where R 1 is H, a halogen atom, alkyl or alkoxy, R 4 is a group having a polymerizable C═C double bond and a linking moiety with an ester and/or ether group, and R 5 is H, or a straight or branched alkyl of 1-6 carbon atoms, the method comprising: a) preparing a compound (F) where R 2 is OR, and R is an organic leaving group; b) deprotecting the R 2 group of the compound (F) to produce a compound (D): where R 3 is OH; and then c) reacting the compound (D) with an alkyl halide substituted with a polymerizable C═C double bond, or a carboxylic acid halide or anhydride having a polymerizable C═C double bond thereon to produce said compound (E).