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Hexamethylene tetramine hydrotribromide is found to be superior to pyridine hydrotribromide when compared with the rate of reaction and chemoselectivity for the regioselective cyclisation of a number of ortho-cyclohexenyl phenols 1 (a-j) to 3-bromo-2, 4-propano-chromans 2 (a-j).
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Majumdar et al. (1996) studied this question.
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