6-Trichloromethyl-6-propiolactone

Trichloromethyl-)3-propiolactone reacts by its sp2C electrophilic center, and a mixture of 2-iminothiazoline and 2-aminothiazole derivatives is obtained, which shows that with this particular electrophilic center both nuclear and exocvclic nitrogens are involved (284). 

Treatment of 2-methylthioimidazoline (653) with /3-trichloromethyl-j8-propiolactone (654) produced (655), presumably by initial iV-acylation and then cyclization to form the oxazine ring (69JOU1790). 

In the cationic polymerization of P-trichloromethyl-P-propiolactone retention (lie) dominates 21). 

Figure 4. Melting temperatures (T ) and glass transition temperatures (T ) of poly(3-trichloromethyl 3-propiolactones) (circles) and poly(3 trifluoromethy1-3-methyl 3-propiolactones (triangles).

Trichloromethyl-p-propiolactone (44) similarly acylates 2-amino-thiazole (as well as 2-amino-1,3 4-thiadiazoles) at the nuclear and exocyclic nitrogen, yielding (45) and (46). ... 

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