Formamides startg

Dry Na-salt of N-(2 -dilorobenzoyl)-2-hydroxyaniline refluxed 72 hrs. in dimethyl-formamide 10,ll-dihydro-ll-oxodibenz[b,f-l,4]oxazepine. Y 90% based on startg. m. consumed. F. e., also analogous thiaza or diaza rings, and by ring expansion through Beckmann rearrangement, s. K. Nagarajan, C. L. Kulkarni, and A. Venkateswarlu, Indian J. Chem. 6, 225 (1968). 

Continuous reactor. A soln. of 1,3,3-triethoxy-l-methoxypropane, formamide, and alcohol passed for 7 hrs. by means of an Ng-stream at 208° over mont-morillonite catalyst KSF between glass ring layers at such a rate that the reaction takes place during 3-6 min. pyrimidine (startg, m. f. 567). Y 72%. F. e. s. H. Bredereck, R. Gompper, and H. Herlinger, B. 91, 2832 (1958). 

---