Synthesis of some new Rhodium complexes containing diaryl chalcogenide ligands and their uses as catalysts in hydrosilylation of alkenes

Diaryl Chalcogenides (i.e. Ar2E where Ar = 4-CH3C6H4, 4-BrC6H4, E= S, Se and Te) were reacted with [RhCl(CO)2]2 and rhodium(III) chloride trihydrate to give compounds of type [RhCl(CO)2(Ar2E)] and [RhCl3(Ar2E)3], respectively. All compounds were characterized by IR, NMR, and mass spectroscopic data. Attempts to prepare hydroxyapatite (HAp) supported rhodium catalyst by using different methods were unsuccessful. Complexes [RhCl(CO)2((4-R-C6H4)2S)], [RhCl(CO)2((4-R-C6H4)2Se)] and [RhCl(CO)2((4-R-C6H4)2Te), where R= CH3 or Br], were evaluated as catalysts for hydrosilylation of allyl phenyl ether and 1-decene. They showed good catalytic activities for hydrosilylation of alkenes with triethoxysilane.

Microwave-Assisted, One-Pot Synthesis of Doxycycline under Heterogeneous Catalysis in Water

The selective synthesis of active pharmaceutical molecules is a challenging issue, particularly when attempting to make the reactions even more sustainable. The present work focuses on the microwave-assisted hydrogenolysis of oxytetracycline to selectively produce α-doxycycline. Although the combination of microwave irradiation and a heterogeneous rhodium catalyst provided good conversions, the selective synthesis of active α-doxycycline was only achieved when an oxytetracycline-cyclodextrin complex was used as the starting material, giving the desired product at 34.0% yield in a one-step reaction under very mild conditions.

Doubleisomerization / cycloisomerization / aromatization of 1-(allyloxy)-2-(cyclopropylmethyl)benzenes to give 2-ethyl-3-isopropylbenzofurans using multitasking single rhodium catalyst

Multitasking single-catalyst systems that allow multiple chemical transformations within a single reaction vessel are important for the development of eco-compatible chemistry. Here, we have developed a rhodium-catalyzed system that transforms...

Electrochemical-Enabled Rhodium-Catalyzed [4+2] Annulations of Arenes with Alkynes

Herein, the electrochemically driven, Rh(III)-catalyzed regioselective annulations of arenes with alkynes have been established. The strategy combined by rhodium catalyst with electricity not only avoids the need for stoichiometric amount...

Rhodium Catalyzed Multicomponent Dehydrogenative Annulation: One-step Construction of Isoindole Derivatives

A strategy for one-pot synthesis of isoindoles is described via a catalytic multicomponent dehydrogenative annulation of diarylimines, vinyl ketones and simple amines. In the presence of a rhodium catalyst and...