Members of the disubstituted vinyl polymer family [‒CH2‒CRR‒]nare of intense scientific interest because of the nature of their backbone and side chains. When R and R' are different groups, these polymers have the capability of forming stereoregular polymers with different physical properties [48]. The simplest regular arrangement of successive groups along a chain are the isotactic (Fig. lb), on which all R substituents are located on the same side of the zigzag plane, representing the chain stretched out in an all trans conformation; and the syndiotactic arrangement, in which the R groups alternate from side to side (Fig. la). In the atactic arrangement the R groups appear at random on either side of the zigzag plane.