Woollins' reagent

2,4-diphenyl -1, 3,2,4 - diselenadiphosphetan -2 ,4- diselenide

Red crystals

Fixed

192-204 ° C

Risk

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Woollins ' is a chemical reagent, or more precisely, a phosphorus-and selenium-containing organic compound, and can be used as selenium analog of the Lawesson's reagent can be considered.

Production

Woollins ' reagent is in high purity and yield by the reaction of Dichlordiphenylphosphin with Na2Se (prepared by reaction of elemental selenium with sodium in liquid ammonia ) were synthesized. Alternatively, it can be 5 prepared with elemental selenium by the reaction of the pentamer ( pph).

Use

Woollins ' reagent has proved to be useful for the production of Selenocarbonylverbindungen from carbonyl compounds. Thus, the synthesis of selenoamides ( selenium analogues of carboxylic acid amides and thionamides ) and Selenoaldehyden described ( selenium analogues of aldehydes ). The implementation of Woollins ' reagent with carboxylic acids, alkenes, alkynes and nitriles is also known.