Three distyryl monomers, methyl 4,6-O-isopropylidene-2,3-bis-O-(4-vinylbenzoyl)-alpha-D-gluco- (1a), altro-(1b) and mannopyranoside (1c), were prepared. These monomers possess the same configuration except for the torsion angle between the two (4-vinylbenzoyl) groups, which is 60 degrees, -60 degrees and 180 degrees for 1a, 1b and 1c respectively. Their cyclocopolymerizations with styrene (2) were carried out using alpha, alpha’-azobisisobutyronitrile in toluene at 60 degrees C. The resulting copolymers were hydrolysed using potassium hydroxide in methanol/tetrahydrofuran under reflux and then treated with diazomethane to yield poly(methyl 4-vinylbenzoate-co-styrene)s (4a, 4b and 4c). The copolymer 4a showed optical activity with a maximum specific rotation ([alpha](23)(435), c=1.0 in CHCl3) of -6.0 degrees. Copolymers 4b and 4c had optical rotations of -1.9 degrees and -2.0 degrees respectively, which were smaller than that of 4a. The chirality was negative for la and positive for Ib, and was positive for 4a and 4b. On the other hand, Ic showed a very weak Cotton effect, and the chirality was positive for 4c.