Acylselenoureas

Abstract

small sorptions to which data at these temperatures are limited.8 It does not appear possible to decide definitely whether this type of analysis is applicable to the lower temperatures without extensions of the data to larger sorptions. For the higher-temperature region, however, there seems little doubt that the model yields a satisfactory interpretation of the experimental data. It does not follow that the underlying assumptions are entirely correct. As has already been suggested, the correction factor (1 + S?a)~1 is introduced in an arbitrary way.

Photoisomerization of Ethyl 2–(3–Acylselenoureido)thiophene– 3–carboxylates and Their Benzoanalogues

“…1-Acyl-3-substituted selenoureas were prepared for the first time by Douglas via addition of amines to acylisoselenocyanates in anhydrous aprotic solvents [2]. Acylisoselenocyanates can be synthesized in situ by the reaction of acylchlorides with potassium selenocyanate in acetone solution.…”

Isoselenocyanates: A Powerful Tool for the Synthesis of Selenium-Containing Heterocycles

“…The generation of the acylisoselenocyanates was confirmed by a subsequent reaction with nucleophiles (Scheme 3) [21]. Douglas reported a reaction of the acylisoselenocyanates with amine in 1937 [20]. …”

“…Other methods of only limited applicability include, the alkylation of selenocyanate ion [16], the reaction of N-aryl-carbimidic dichlorides with sodium selenide [17], the treatment of isocyanates with phosphorous(V) selenide [17b], photochemical rearrangement of selenocyanates 6 [18] and via cycloaddition by the reaction of nitrile oxides 7 with primary selenoamides [19]. Acylisoselenocyanates 2 were prepared by a reaction of acyl chloride with potassium selenocyanate (Scheme 2), a method first investigated by Douglas [20]. The acylisoselenocyanates were never isolated.…”

Synthesis and Structural Characterization of a Gallium(III) Bis(selenoureato) Complex

“…B. Douglass [1]. More than 30 years later, the group of L. Beyer showed that such selenoureas readily react with metal salts to form chelate complexes.…”