Selective Transfer Hydrogenation of C=O and Conjugated C=C Bonds Using An NHC‐Based Pincer (CNC)Mn^I Complex in Methanol**

ChemSusChem, Год журнала: 2023, Номер 16(18)

Опубликована: Июнь 8, 2023

Base metal catalyzed transfer hydrogenation reactions using methanol is highly challenging. Employing a single N-heterocyclic carbene (NHC)-based pincer (CNC)MnI complex, chemoselective and double of α, β-unsaturated ketones to saturated or alcohols by utilizing as the hydrogen source disclosed. The protocol was tolerant towards selective C=C C=O bonds in presence several other reducible functional groups led synthesis biologically relevant molecules natural products. Notably, this first report Mn-catalyzed carbonyl with methanol. Several control experiments, kinetic studies, Hammett density theory (DFT) calculations were carried out understand mechanistic details catalytic process.

Язык: Английский

---

Hydrogenation of Carboxylic Esters Catalyzed by Phosphine-Free Bis-N-heterocyclic Carbene Manganese Complexes

Organometallics, Год журнала: 2023, Номер 42(14), С. 1832 - 1838

Опубликована: Июнь 5, 2023

As an earth-abundant transition metal, manganese is now recognized as a good candidate for the development of catalysts reduction-type reactions. It often associated with noninnocent tridentate ligand, featuring acidic NH moiety. We report here that simple bidentate and phosphine-free bis-N-heterocyclic ligand in complex [Mn(bis-NHCMes)(CO)3Br] could catalyze hydrogenation carboxylic esters presence KBHEt3 activator at 100–120 °C under 50 bar H2 1 mol % catalyst loading 2-Me-THF.

Язык: Английский

---

Bench‐Stable Manganese NHC Complexes for the Selective Reduction of Esters to Alcohols with Silanes

Advanced Synthesis & Catalysis, Год журнала: 2020, Номер 362(12), С. 2437 - 2443

Опубликована: Апрель 2, 2020

Abstract Selective reduction of esters to alcohols was accomplished through Mn(I)‐mediated hydrosilylation reaction. The manganese tricarbonyl complex [Mn(bis‐NHC)(CO) 3 Br] resulted an active pre‐catalyst for the a variety using phenylsilane and cheap readily available polymethylhydrosiloxane. An in situ examination catalytic reaction 55 Mn NMR spectroscopy allowed us detect formation Mn(I) intermediate species. magnified image

Язык: Английский

---

Ligand-tuned cobalt-containing coordination polymers and applications in water

Green Chemistry, Год журнала: 2020, Номер 22(23), С. 8452 - 8461

Опубликована: Янв. 1, 2020

Co-CIA could realize the alkylation of ketones and alcohols, alcohols without extra bases organic solvents, while Co-NCIA was effective for synthesis 1-benzyl-2-aryl-1H-benzo[d]imidazoles from various phenylenediamine benzyl in water.

Язык: Английский

---

Recent advances on N-heterocyclic carbene transition metal complexes for dehydrogenative catalysis using alcohols

Catalysis Today, Год журнала: 2020, Номер 370, С. 114 - 141

Опубликована: Окт. 20, 2020

Язык: Английский

---