SYNOPSISAbout 38% conversion of carbonyl groups into epoxy functions in the molecular chain of poly (N-vinyl pyrrolidone) using chloracetamide results in the decreased viscosity of the product. De-epoxidation of the epoxy groups introduced shows the most contributing factor towards decreased viscosity is epoxy function.In a previous study, we reported on the synthesis of some methyl aryloxymethacrylates, the polymers we obtained by different methods, and some characterization studies, such as an evaluation of MarkHouwink's constants, X-ray diffraction patterns of fibers, etc., performed on these polymers.' The present work shows the possibility of carrying out DarZen's glycidic ester condensation reaction across a polymeric carbonyl group. The use of Darzen's condensation reaction in the conversion of aldehydic and ketonic functions into epoxy function is well established in both aromatic and aliphatic compounds, including terpene ketones, by employing a host of condensing agents and a variety of condensing No reference in the literature is found, however, for the conversion of a polymeric carbonyl into an epoxy derivative. Also, polymers or copolymers having an epoxy linkage are made from monomers containing an epoxy group, which, in turn, is introduced into the precursor through Darzen's condensation, epichlorohydrin reaction, etc. It is, however, observed that commercial poly (N-vinyl pyrrolidone) , PVP, can undergo DarZen's glycidic ester condensation reaction under certain conditions. PVP finds extensive applications, especially as a water soluble polymer, and its condensation product from Darzen's reaction, which is soluble in water, is found to have a lower viscosity than PVP. In as much as viscosity reducers have