The conjugated (Z)-enynes 2a, 2d–g and (Z)-enediynes 2h–j were synthesized by dehydration of prop-2-ynyl alcohols 1a, 1d–j with polyphosphoric acid trimethysilyl ester.
M. Yoshimatsu, H. Yamada, H. Shimizu and T. Kataoka, J. Chem. Soc., Chem. Commun., 1994, 2107 DOI: 10.1039/C39940002107
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