Synthesis and spectral characterization of azidoketenimines

Cycloaddition−Elimination Reactions of 5-Imino-1,2,4-thiadiazolidin-3-ones and 5-Imino-1,2,4-dithiazolidin-3-ones with Electron-Rich Double Bonds

“…The reactivity of 1 and 2 towards electrophilic dipolarophiles decreases with decreasing electrophilic power Primary adducts 4, containing a cyclohexane ring, are less stable. For example, 4a is only isolable as a crystalline of the dipolarophiles [1] [2] [3] [4] [5] . Only 1a reacts slowly with CS 2 [5] , non-polar olefins and the less nucleophilic enol compound when traces of acids are strictly excluded.…”

“…Obviously, the reactivity of the heterocycles reactions with unsaturated systems of the type ElϭNu, 1 or 2 is determined by the electrophilic properties of the S yielding heterocycles A according to Scheme 1. [1] [2] [3] [4] atom. Thiadiazolidines 1 are more reactive than dithiazolid-Scheme 1.…”

“…Isocyanway depends on the size of the carbocycle. The cyclopenates [1] [3] [4] , isothiocyanates [1] [2] [4] , activated nitriles [2] [4] , ketane derivatives 3 can be isolated by column chromatogratenes [1] [2] as well as CS 2 [4] have been used. In a single phy.…”