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Synthesis 2006(22): 3801-3804
DOI: 10.1055/s-2006-950298
DOI: 10.1055/s-2006-950298
PAPER
© Georg Thieme Verlag Stuttgart · New York
Chemoselective Thioacetalization Using 3-(1,3-Dithian-2-ylidene)pentane-2,4-dione as an Odorless and Efficient Propane-1,3-dithiol Equivalent under Solvent-Free Conditions
Further Information
Received
10 May 2006
Publication Date:
09 October 2006 (online)
Publication History
Publication Date:
09 October 2006 (online)
Abstract
As a non-thiolic, odorless propane-1,3-dithiol equivalent, 3-(1,3-dithian-2-ylidene)pentane-2,4-dione has been investigated in acid-promoted thioacetalization under solvent-free conditions. A range of selected aldehydes and aliphatic ketones have been converted into the corresponding dithioacetals in high yields. The relatively slow reaction rate of aromatic ketones allowed chemoselective protection of aromatic aldehydes or aliphatic ketones, in contrast to aromatic ketones.
Key words
chemoselectivity - concentrated hydrochloric acid - solvent-free reaction - thioacetalization - α-oxo ketene S,S-acetals
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