283593-05-5Relevant articles and documents
Mesoionic Carbene Cobalt Complexes as Multipurpose Catalyst Precursors for Hydrosilylation and Dihydropyrimidinone Synthesis
Albrecht, Martin,Bertini, Simone
, (2021/11/09)
Metalation of CH2OH-substituted triazolium salts with CoCl2 under basic conditions affords C,O-bidentate chelating carbene Co(III) complexes (3a, 3b), while analogous phenyl-substituted triazolium salts produce monodentate carbene Co(II) complexes (3c, 3d). The distinct substituent-induced properties of the metal centers were demonstrated by electrochemical measurements and catalytic activities in two specific processes. The complexes showed appreciable activity in the reduction of C=O bonds through hydrosilylation, with methoxybenzene-functionalized triazolylidene Co(III) complex 3a achieving a high selectivity towards aldehydes vs. ketones with turnover frequencies (TOFs) up to 200 h?1. The C,O-chelate systems were also active catalysts in the Biginelli process, a one-step three-component reaction for efficient dihydropyrimidinone synthesis. Optimization of reaction conditions provides high activity with complex 3a, reaching TOFs of 800 h?1, the highest activity known for cobalt NHC complexes to date.
Preparation method and application of novel ionic salicylaldehyde Schiff base zirconium complex (by machine translation)
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Paragraph 0066-0067, (2019/11/20)
The invention belongs to the technical field of catalytic organic synthesis, and particularly relates to a preparation method and application of a novel ionic salicylaldehyde Schiff base zirconium complex. The cationic part is formed by coordination of zi
One-pot synthesis of 3,4-dihydropyrimidin-2(1H)-ones catalyzed by SO3H@imineZCMNPs as a novel, efficient and reusable acidic nanocatalyst under solvent-free conditions
Abbaspour-Gilandeh, Esmayeel,Yahyazadeh, Asieh,Aghaei-Hashjin, Mehraneh
, p. 40243 - 40251 (2019/01/03)
The synthesis of 3,4-dihydropyrimidin-2(1H)-one derivatives was accomplished efficiently via a three-component reaction between ethyl acetoacetate, various types of aldehydes, and urea in the presence of 10 mg SO3H@imineZCMNPs as a novel, envir