Chloro- and dichloro-3-alkyl-1,2,3-benzotriazin-4(3H)ones

Several chloro- and dichloro-3-alkyl-1,2,3-benzotriazin-4(3H)ones have been prepared by diazotization of methyl anthranilates. A brief study was made of factors affecting the formation of 3-allyl-1,2,3-benzotriazin-4(3H)one from methyl anthranilate. Good nmr evidence was obtained to substantiate the previously proposed methyl 2-(3-allyltriazeno)benzoate (VIc) intermediate.