Z-Enol esters are obtained via region- and stereo-selective addition of carboxylic acids to terminal alkynes, with formation of a C(1) carbon–oxygen bond, in the presence of a [Ru{Ph2P(CH2)nPPh2}{η3-CH2–C(Me)CH2}2] catalyst precursor.
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Doucet et al. (1993) studied this question.
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