Pyridine 4-methylbenzene-1-sulfonate → 7-Phenylhept-6-yn-1-ol

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Pyridine toluene-4-sulphonate (0.75 g, 3 mmol) was added to a magnetically stirred solution of 2-(7-phenylhept-6-ynyloxy)-tetrahydro-2H-pyrane (7) (13.62 g, 50 mmol) in dry methanol (300 mL). The reaction mixture was stirred at 55° C. and monitored by TLC. When all the base material had been converted, methanol was distilled out on a rotary evaporator and water (200 mL) was added to the residue. The aqueous phase was extracted with petroleum ether (boiling point 40-60° C.)/Et2O 1:1 (5×50 mL). The combined organic phases were washed with water (2×20 mL) and dried (MgSO4). Distillation on a rotary evaporator yielded 9.1 g (97%) of a yellow viscous oil. TLC and NMR indicated a pure product.

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