The reactions of alkynes and a-nitro-olefines with methylazide and phenylazide was studied. In contrast to known reactions with alkynes which are non-regioselective, methylazide and phenylazide react regiospecifically with a-nitro-olefines and give only one type of triazole after elimination of HN02. These reactions are very useful synthetic approaches to 1,2,3 triazoles.Les 1,2,3 triazoles ont fait I'objet de nombreux

Phenylazide and methylazide reacts with title olefines and gives two isomeric triazoles without nitro group, and 4-nitro-l,2,3 triazole. The isomerisation of starting alkenes explains the formation of isomeric triazoles. Oxydation of amino-nitro-diazocompounds in equilibrium with 1,2,3 triazolines leads to 4-nitro-l,2,3 triazoles.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Cycloadditions of diazomethane and diazoethane on methyl a-nitro paranitrocinnamates E and 2 lead to corresponding pyrazol-1 -ines. Relations between stereochemistry (and conformation) of these latter and nature (and stereochemistry) of obtained compounds during their thermolysis are shown. After isomerisation in pyrazol-2-ines and removal of HN02, these pyrazol-1 -ines give pyrazoles, In comparison, reactions of a-nitro paranitrobenzylidene acetone 2 with CH2N2 and CH3CHN2 are also studied.L'addition des dipzles -1,3 aux d6-