(Geminal, geminal) dienol diesters are obtained in one step by direct addition of carboxylic acids to terminal diynes in the presence of ruthenium catalysts such as RuCI2(PR3)(arene) or [Ru(μ-O2CH)(CO)2(PR3)]2 while the catalyst [PPh2(CH2)4PPh2]Ru[η3-CH2=C(Me)CH2]2 favours the formation of regioselective (Z,Z) dienol diesters.
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