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The by-products of the thermal ring-opening polymerization of a six-membered N3P2S ring were identified as 12-, 18-, 24-, 30-, and 36-membered sulfur(VI)/nitrogen/phosphorus macrocycles. The 24-membered macrocycle 1 is the largest inorganic ring system that has yet been characterized by X-ray crystallography.
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Ni et al. (1995) studied this question.
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