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Polymers of substituted norbornenes were produced using palladium catalysts in the presence of formic acid (FA) as a chain transfer agent (CTA) which act to control molecular weight as well as to increase conversion. Spectroscopic analysis of these polymers by H NMR and MALDI-TOF MS confirmed that hydrogen-terminated polynorbornenes are generated leading to extremely low optical densities at 193 nm. Deuterium labeling studies were conducted in order to discern possible chain transfer mechanisms.

Palladium Catalyzed Vinyl Addition Poly(norbornenes): Formic Acid as a Chain Transfer Agent. Mechanism and Polymer Optical Properties