described synthesis d were used instead of 4 3 g of 2 2 39 3 3 39 tetrafluoro 4 4 39 dihydroxybiphenyl to give 0 34 g y 3 6 of 3 3 39 difluoro 4 4 39 bis 8 acryloyloxy octyloxy biphenyl the purity of this material was 99 5 measured by hplc and 1 spot measured by tlc also according to the results of the ir measurement the fact that a molecular ion peak was observed in 586 by the mass analysis and the types of the starting materials used the resulting material was identified as the marked material the same procedure as in the synthesis c of example 1 was repeated except that 32 7 g of 2 3 difluoro 4 methoxymethoxy phenyl boronic acid obtained in the synthesis b of example 6 were used instead of 24 g of 2 3 difluorophenyl boronic acid and 35 7 g of methoxymethyl 4 bromo 2 fluorophenyl ether obtained in the synthesis a of example 7 were used instead of 33 g of methoxymethyl 4 bromophenyl ether to give 20 5 g y 50 of 2 3 3 39 trifluoro 4 4 39 bis methoxymethoxy biphenyl the same procedure as in the synthesis d of example 1 was repeated up to the distillation step of the solvent except that 21 7 g of 2 3 3 39 trifluoro 4 4 39 bis methoxymethoxy biphenyl obtained in the above described synthesis a were used instead of 20 1 g of 2 3 difluoro 4 39 methoxymethoxy biphenyl to give 14 7 g of the crude 2 3 3 39 trifluoro 4 4.