DBU and DBN are Strong Nucleophiles: X‐Ray Crystal Structures of Onio‐ and Dionio‐Substituted Phosphanes
1993; Wiley; Volume: 32; Issue: 3 Linguagem: Inglês
10.1002/anie.199303991
ISSN1521-3773
AutoresRobert W. Reed, Régis Réau, Françoise Dahan, Guy Bertrand,
Tópico(s)Asymmetric Synthesis and Catalysis
ResumoNew light is thrown on the reactivity of the reagents DBU and DBN, which are often used in base-induced dehydrohalogenations, by their reaction with chloro- and dichlorophosphanes. They form chloride salts with onio- and dionio-substituted phosphanes as cations; that is, DBN and DBU behave as nucleophiles! After anion exchange with KPF6 these salts can be obtained in crystalline form. The dication 1, for example, was characterized by X-ray diffraction. R = (cyclo-C6H11)2N.
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