No abstract

A condensation between mesylamide and glyoxal under highly acidic conditions was studied. A series of new compounds whose structures contain a moiety of oxaazatetracyclo[5.5.0.0 3,11 .0 5,9 ]dodecane were synthesized. The synthesis processes were optimized and main factors affecting the assembling of cage products were revealed. Assumptions are made regarding the formation mechanism of these chemical entities. For the first time, compounds have been obtained that include moieties of 2,6,8-trioxa-4,10,12-triazatetracyclo[5.5.0.0 3,11 .0 5,9 ]dodecane and 2,4,6-trioxa-8,10,12-triazatetracyclo[5.5.0.0 3,11 .0 5,9 ]dodecane. An X-ray diffraction analysis of the new compounds was performed.

No abstract

No abstract

Three new functional 2‐substituted 1,3‐dinitroimidazolidines were synthesized herein. A synthetic strategy is suggested for structurally different α,α‐dinitraminocarboxylic acids via condensation of glyoxylic acid ethyl ester with amine or amide derivatives. Alkali‐ and acid‐catalyzed hydrolyses of ethyl 1,3‐dinitroimidazolidine‐2‐carboxylate were studied. A series of hydrolysis products were isolated. The Curtius rearrangement of 1,3‐dinitroimidazolidine‐2‐carboxylic acid to 2‐isocyanato‐1,3‐dinitroimidazolidine was carried out. Hydrolyses of 1,3‐dinitroimidazolidine‐2‐carbonyl azide and 2‐isocyanato‐1,3‐dinitroimidazolidine were studied. 1,3‐Dinitroimidazolidine‐2‐amine was captured as 1,3‐bis(1,3‐dinitroimidazolidin‐2‐yl)urea.