ISSN:
1434-4475
Keywords:
S-Betaines
;
Bis-trihaloacetyl-S-methylides
;
Trifluoroacetyl-S-methylides
;
3-Chloro-1-chloroacetoxycarbonyl-2-oxo-1-tetrahydrothiophenium-1-yl-propanide
;
X-ray structure
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Thetin (1) and the betain of-Thiolanyl-acetic acid,5 react with the anhydrides of trifluoroacetic acid (TFA) and trichloroacetic acid (TClA), respectively, to give stable diacyl-S-ylides2a,b and6a,b, respectively. In contrast to the corresponding N-betaines,1 and5 react with monochloroacetic anhydride (MClA) under formation of the diacyl-ylid2c from1, and the mixed anhydride of chloroacetic acid and chloroacetylthiolaniummethylid carboxylic acid9 from5. The formation of9 requires the establishment of an equilibrium between S-betain and S-ylid forms. An X-ray analysis has been performed on2a.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00811252
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