Several 1,n-diols were monoprotected with high selectivity by tetrahydropyranyl ether formation in dihydropyran–hexane in the presence of a catalytic amount of Al2(SO4)3 supported on silica gel.
T. Nishiguchi and K. Kawamine, J. Chem. Soc., Chem. Commun., 1990, 1766 DOI: 10.1039/C39900001766
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