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)![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
CH2}2] catalyst precursor.
H. Doucet, J. Höfer, C. Bruneau and P. H. Dixneuf, J. Chem. Soc., Chem. Commun., 1993, 850 DOI: 10.1039/C39930000850
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