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Communication | Regular issue | Vol 27, No. 4, 1988, pp.877-880
Published online, 1st January, 1970
DOI: 10.3987/COM-87-4450
Alkylation of Isolated Thiamin Ylide

Hirohiko Sugimoto and Kentaro Hirai*

*Shionogi Research Laboratories, Shionogi & Co. Ltd., Fukushima-ku, Osaka 553-0002, Japan

Abstract

Alkylation of isolated thiamin ylide (TY, 3) in EtOH under the neutral conditions afforded thiamin (TH+C1-,1) and the alkylated yellow form 4, which provides direct chemical evidence for the disproportionation of thiamin ylide into the ion pair of the yellow form (TH+YF-,6)in a protic solvent.