A number of polyfunctional molecules have been examined as substrates for the 5-Endo-Trigonal ring-forming reaction, and it has been found that for first-row elements this is a disfavoured process, alternative reactions of type 5-Exo-Trig generally taking precedence; one case of a 5-Endo-Trig closure for a second-row element, sulphur, has been found.
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Journal of the Chemical Society, Chemical Communications
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