Natural Kaolinitic Clay: A Mild and Efficient Catalyst for the Tetrahydropyranylation and Trimethylsilylation of Alcohols
T. T. Upadhya et al.
Synthetic Communications, Volume 26, Issue 24 December 1996, pages 4539 - 4544
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http://dx.doi.org/10.1080/00397919608004777