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The ene-triyne 1 has previously been synthesized by Bohlmann et al. using a Wittig reaction, ref 8a.
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1-Phenylhepta-1,3,5-triyne (2) has previously been synthesized by Cadiot-Chodkiewicz coupling and elimination protocols: (a) Meier, J.; Chodkiewicz, W.; Cadiot, P.; Willemart, A. C. R. Hebd. Séances Acad. Sci. 1957, 245, 1634-1636. (b) Mavrov, M. V.; Kucherov, V. F. Bull. Acad. Sci. USSR Div. Chem. Sci. (Engl. Transl.) 1966, 833-836. (c) Shim, S. C.; Lee, T. S. Bull. Korean Chem. Soc. 1986, 7, 357-362.
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0041965470
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Empirical evidence suggests that lithium-halogen exchange is more rapid than quenching of the n-BuLi by adventitious water. Any water present in the reaction medium therefore results in in situ protonation of the carbenoid intermediate. This extensively complicates purification because of similar retention times on common chromatographic supports, thus reiterating the need for strictly anhydrous reagents and reaction conditions.
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