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Polystyrene-supported acyclic diaminocarbene palladium complexes in Sonogashira cross-coupling: Stability vs. catalytic activityстатья
- Авторы: Mikhaylov V.N., Sorokoumov V.N., Liakhov D.M., Tskhovrebov A.G., Balova I.A.
- Журнал: Catalysts
- Том: 8
- Номер: 4
- Год издания: 2018
- DOI: 10.3390/catal8040141
- Аннотация: Two types of immobilized on the amino-functionalized polystyrene-supported acyclic diaminocarbene palladium complexes (ADC-PdII) are investigated under Sonogashira cross-coupling conditions. Depending on substituents in the diaminocarbene fragment immobilized ADC-PdII, systems are found to have different catalytic activity and stability regarding Pd-leaching. PdII-diaminocarbenes possessing protons at both nitrogen atoms smoothly decompose into Pd0-containing species providing a catalytic “cocktail system” with high activity and ability to reuse within nine runs. Polymer-supported palladium (II) complex bearing NBn–Ccarbene–NH-moiety exhibits greater stability while noticeably lower activity under Sonogashira cross-coupling. Four molecular ADC-PdII complexes are also synthesized and investigated with the aim of confirming proposed base-promoted pathway of ADC-PdII conversion through carbodiimide into an active Pd0 forms. © 2018 by the authors. Licensee MDPI, Basel, Switzerland.
- Добавил в систему: Цховребов Александр Георгиевич