N‐Chlorcarbonyl‐isocyanat – Synthese und Reaktionen

An Easy Access to Hydrazinocarbonyl Carbamic Acid Ethyl Esters

“…However, the reaction of 1 with hydrazines has not been investigated until now. Comparable reactions of hydrazine carboxylic acid ethyl ester with 1 [3] and of carboisocyanatidic acid phenyl ester with hydrazine compounds [4] have already been described. In this paper, the preparation of substituted semicarbazides from carboisocyanatidic acid ethyl ester and hydrazine compounds as well as the thermal reactions of these compounds are described.…”

“…In former work we have described the multistage preparation of [1,2,4]triazolo[1,2-a][1,2,4]triazole-1,3,5,7-tetraone 8 [5]. In the reaction of 1,2,4-triazole-3,5-dione (6) with 1, a quantitative yield of (3,5-dioxo [1,2,4]triazolidine-1-carbonyl)-carbamic acid ethyl ester (7) is obtained.…”

“…The thermal cyclization of the products to 1-substituted 3,5-dioxo-1,2,4-triazolidines and to [1,2,4]triazolo[1,2-a][1,2,4]triazole-1,3,5,7-tetraone was investigated. …”

Carbonyl‐isocyanat‐isothiocyanat

“…Carbonyl-isocyanat-isothiocyanat (1) ist ein starkes bifunktionelles Elektrophil und ein schlechtes Nucleophil. Es liegt in seiner Reaktionsfreudigkeit zwischen dem noch reaktiveren Carbonyl-diisocyanat OCN -CO -NCO '-I2) und dem reaktionstrageren Carbonyl-diisothiocyanat SCN -CO -NCSI3).…”

“…B. rnit Diaminen, interessant sein konnten. Carbonyl-isocyanat-isothiocyanat (1) addiert Amine prim& a n die Isocyanatgruppe. Mit einem Mollquivalent Amin erhalt man die isolierbaren Allophanoyl-isothiocyanate 11, die mit einem weiteren Molaquivalent Amin unter Substitution der Isothiocyanatgruppe zu den Biureten 12 reagieren.…”