Formamidines trisubst

Formamidines s. Chloro-formamidine-N-carbonyl chlorides, 3-Isoxazolyl-formamidines, N-Sulfonyl formamidines —, trisubst. 19, 494 Formamidine sulfides... 

Two groups of investigators have found independently that acetals of dimethylformamide are excellent reagents for the preparation of esters and phenolethers under mild conditions 2,4-Disubst. s-triazines and trisubst. formamidines have been prepared with dimethylformamide diethyl acetal in particular There are other synthetically interesting derivatives of N,N-disubst. amides, e.g. their chlorides. They give a variety of valuable products, including heterocyclics, in a simple manner The most frequently used of these amide chlorides is dimethylchloroformiminium chloride, which has already been mentioned in last year s Trends... 

Disubst. 1,3,5-triazines. Guanidine in abs. ethanol added dropwise at room temp, during 15 min. to dimethylformamide diethyl acetal, then heated to reflux at a bath temp, of 85° 2,4-diamino-s-triazine. Y 86%. F. e., also trisubst. formamidines, s. H. Bredereck, F. Effenberger, and A. Hofmann, B. 97, 61 (1964). 

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