title: Study of the thermal behavior of azidohetarenes with differential scanning calorimetry.
abstract: Thermal properties of azidohetarenes without reactive ortho-substituents, obtained by DSC analysis, were compared with the DSC data of ortho-phenyl and ortho-acyl substituted azidohetarenes, which give ring closure reactions either to indoles or to five-membered heterocycles such as isoxazoles. The reaction temperatures and reaction enthalpies give both information to prepare the reaction conditions and important safety information and were, in addition, used to find out relations between the temperatures or enthalpies with the three different reaction mechanisms.
authors.affiliation: Organic Synthesis Group, Department of Chemistry, Karl-Franzens-University of Graz, Heinrichstrasse 28, A-8010 Graz, Austria. wolfgang.stadlbauer@uni-graz.at
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Stadlbauer
authors.forename: Gerhard
authors.initials: G
authors.lastname: Hojas
mesh_terms: D001386:Azides / Q000737:chemistry* / Q000145:classification / Q000528:radiation effects*; D001393:Azoles / Q000737:chemistry; D002152:Calorimetry, Differential Scanning / Q000379:methods*; D006358:Hot Temperature; D010069:Oxadiazoles / Q000737:chemistry; D011720:Pyrazoles / Q000737:chemistry; D013696:Temperature
chemical_list: D001386:Azides; D001393:Azoles; D010069:Oxadiazoles; D011720:Pyrazoles; C010166:furoxans; C031280:pyrazole