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Co-ordinatively unsaturated tungstacarbonyl species, formed either chemically or photochemically, react with alkynes H–CC–R to give, after solvolysis of presumed vinylidene complexes by R'OH, in the presence of SiO2, the fischer-type carbene complexes (CO)5WC(OR′)(CH2R).
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Parlier et al. (1986) studied this question.
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