25769-36-2Relevant articles and documents
Pyrolysis of 3-hydroxy-2-arylhydrazonoalkanoic acid derivatives
Al-Awadi, Nouria A.,Ibrahim, Yehia A.,John, Elizabeth,Parveen, Aneesha
experimental part, p. 1298 - 1307 (2011/04/15)
1,2-Diaza-1,3-butadienes have been obtained from readily available 3-hydroxy-2-arylhydrazonopropanoates under various reaction conditions including pyrolysis, dehydration under Mitsunobu conditions or with acetic anhydride or acetic acid. According to their method of synthesis these 1,2-diaza-1,3- butadienes underwent subsequent reactions to give interesting products, and in the presence of proper dienophiles gave the corresponding cycloaddition products. Also, a new approach to pyrazole-3-carboxylic acid derivatives was discovered during an attempt to dehydrate 3-hydroxy-2-arylhydrazonobutanoic esters.
Cycloaddition Reactions of Sulphines and Thiones with Azoalkenes
Bonini, Bianca F.,Maccagnani, Gaetano,Mazzanti, Germana,Rosini, Goffredo,Foresti, Elisabetta
, p. 2322 - 2327 (2007/10/02)
Fluorenethione S-oxide undergoes (2+4) cycloadditions with azoalkenes to yield 2H-1,2,3-thiadiazine 1-oxides together with a small amount of the regioisomeric 6H-1,3,4-thiadiazine 1-oxides.Fluorenethione, with azoalkenes, undergoes (2+4) regiospecific cycloaddition reactions leading to the formation of 6H-1,3,4-thiadiazine derivatives.Diarylsulphines and diarylthiones fail to react with azoalkenes.