N-Substituted 2,2,2-trifluoroethanimidic acid 1-methylethylidene hydrazides as synthetic blocks for trifluoromethylated nitrogen heterocycles: syntheses and oxidative cyclizations
摘要:
N-Substituted 2,2,2-trifluoroethanimidic acid 1-methylethylidene hydrazides have been prepared and allowed to react with tert-butyl hypochlorite in CH2Cl2. N-Aryl-, N-alkyl-, and N-(methoxycarbonyl)amidrazones 2-4 undergo three types of cyclizations via the initially formed N-chloro intermediates leading to 3-(trifluoromethyl)-1,2,4-benzotriazines, 5, 3-(trifluoromethyl)-5-alkyltriazoles 8 and 9, and 3-chloro-3-(trifluoromethyl)-4-N-(methoxycarbonyl)-5,5-dimethyltriazoline (11), respectively. Reaction mechanisms for the cyclizations are discussed.
Catalyst compositions useful for the polymerization or oligomerization of olefins are disclosed. Certain of the catalyst compositions comprise N-pyrrolyl substituted nitrogen donors. Also disclosed are processes for the polymerization or oligomerization of olefins using the catalyst compositions.
Trifluoroacetimidoyl chlorides 1 were obtained in 80-90 % yields when a mixture of trifluoroacetic acid and a primary amine was heated in carbon tetrachloride in the presence of triphenylphosphine and triethylamine. The corresponding bromides 2 were obtained when carbon tetrabromide was used instead of carbon tetrachloride. Imidoyl iodides 3 were prepared by substitution of the chloro group of 1 by iodide ion in acetone.
MELLER A.; MARINGGELE W.; OESTERLE R., MONATSH. CHEM., 1980, 111, NO 5, 1087-1096