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New cyclic olefin polymers (COP) with a better balance of properties than those of conventional optical plastics have been developed by using norbornene monomers. The COP are prepared by ring‐opening metathesis polymerization of norbornene monomers followed by complete hydrogenation of double bonds. The COP have practically been applied for optical uses such as lenses, prisms and optical discs.

Reaction of dialkylnickel complexes, NiR2L2 (R = CH3, C2H5, C3H7; L = 1/2 (2,2′-bipyridine), 1/2[1,2-bis(diphenylphosphino)ethane], triethylphosphine) with carbon monoxide give ketones, diketones and aldehydes depending on the reactivity of the dialkylnickel complexes and the reaction temperature. Nickel complexes NiY2L2 (Y = halogen or alkyl; L = ligand) catalyze formation of ketones and tertiary alcohols from Grignard reagents, aryl halides, and carbon monoxide.

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