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Efficient syntheses and characterization of a platinum metallacyclyne containing one cyclic enyne pocket ( 3 ), the first dinuclear platinum metallacyclyne containing two cyclic enyne pockets ( 4 ), and 2,2‘,6,6‘-tetraethynyltolan ( 2 ) are reported. Syntheses of 3 and 4 employ bidentate phosphines or cis -platinum starting materials and high dilution techniques to effect high yields.
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Bradshaw et al. (1996) studied this question.
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