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The reaction of m-and p-hydroxyphenylpropyne, 1a and 1b, with Mo(CO)6 (5 mol%) affords metathesis products, 2a and 2b, in 78% and 14% (conversion yield, 78%) yields, respectively. However, o-hydroxyphenylpropyne 1f gave trimerization product 4 in 65% yield.
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Kaneta et al. (1995) studied this question.
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