Properties and applications of newly developed homogeneous Ring-Opening Metathesis Polymerization catalysts as well as Photo-induced Ring-Opening Metathesis Polymerization catalysts are discussed. In contrast to well-defined, one-component metal-carbene catalysts, the aqueous ROMP with simple RuII salts is a chain reaction and not a living polymerization. One-component Photo-ROMP initiators were developed with good thermal latency and are either based on early-transition-metal alkyl complexes or on [Ru(arene)2]2+ complexes. Mechanistic aspects of the photochemically induced solvation of RuII complexes are presented.
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Hafner et al. (1996) studied this question.