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85033805285
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note
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Dialkylacetylenes undergo radical addition of benzenethiol leading to (Z) and (E)-adducts in a Z/E ratio increasing with the size of alkyl substituents (refs 6a,e). The predominant formation of transaddition (Z)-products with hex-3-yne and oct-4-yne would result from predominant occurrence of (Z)-radicals in the mixture of equilibrating GZ)- and (E)-radicals, owing to steric hindrance between the alkyl substituents.
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31
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Reversible radical addition of thiols to alkenyl sulfides leading to dithioacetals has been reported (Oswald, A. S.; Griesbaum, K.; Hudson, B. E.; Bregman, J. M. J. Am. Chem. Soc. 1964, 86, 2877).
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Dzhemilev, U. M.; Baibulatova, N. Z.; Tkatchenko, T. K.; Kunakova, R. V.; Khalilov, L. M.; Berg, A. A. Izv. Mad. Nauk. SSSR, Ser. Khim. 1989, 655; Chem. Abstr. 1989, 111, 232699y.
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39
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note
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The source of these products is still unclear. A study of carbon-centered radical addition to the alkyne triple bond is in progress.
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