AbstractVinyl 4‐benzoyl butyrate, vinyl 4‐(p‐toluoyl) butyrate and vinyl 4‐(m‐nitro‐benzoyl) butyrate were prepared by vinyl interchange with vinyl acetate. Theoptimum conditions for the preparation of these monomers have been studied.Their structures were established by NMR spectroscopy. The polymers of thesemono em were synthesised by free radical polymerization, their molecular weightsand glass temperatures determined. Vinyl 4‐(m‐nitrobenzoyl) butyrate was not‐polymerizable. Vinyl 4‐benzoyl butyrate showed degradcttive transfer reaction on polymerization due to the presence of acti