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Synthesis 1991; 1991(5): 368-370
DOI: 10.1055/s-1991-26467
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N-(Arylmethyl)-2-(or -4)-cyanopyridinium Hexafluoroantimonates as New Useful Catalysts for Acetalization of Carbonyl Compounds

Sang-Bong Lee* , Sang-Do Lee, Toshikazu Takata, Takeshi Endo
  • *Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 227, Japan
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Publication Date:
29 April 2002 (online)

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Carbonyl compounds 1 were converted to the corresponding 1,3-dioxolanes 2 and 1,3-dioxanes 4 with ethylene glycol and 2,2-dimethyl-1,3-propandiol, respectively, in the presence of 1-3 mol% of N-(benzyl, 4-methylbenzyl or 4-methoxybenzyl)-2(or -4)-cyanopyridinium hexafluoroantimonates 3. The catalyst 3d was also effective for the tetrahydropyranylation.