Six monomers of 4-substituted 1，6-dienes：diethyl 1，1-diallyl—malonate (I)，dimethyl 1，1-diallyl—malonate (II)，ethyl 1，1-diallyl—cyano—acetate (III)，ethyl 1，1-diallyl-acetate (Ⅳ)，1，1-α，α’dichloro-diallyl-diethylmalonate (V) and diallyl-disec-butylsilane (VI) (in whjch (II)，(V)and(vI)were unknown in literature)have been synthesized and cyclo-polymerized successfully with benzoyl peroxide as initiator．The efficiency of cyclo-polymerization，average molecular weight and intrinsic viscosity of these organic—solvent soluble polymers were determined． It was also found that monoallyl monomer of such structure as diethyl 1-allyl-malonate could be polymerized without serious “degradation transfer”as usually expected．