Propylene Carbonate as a Solvent for Asymmetric Hydrogenations

Abstract

A penny saved is a penny earned: The use of propylene carbonate as the solvent in iridium‐catalyzed hydrogenations of nonfunctionalized olefins allows efficient catalyst recycling through the formation of two‐phase mixtures with nonpolar solvents such as n‐hexane. In the picture, the hydrogenated tetrahydronaphthalene derivative is extracted into the hydrocarbon phase.

Comparative Synthesis of Cu and Cu2O Nanoparticles from Different Copper Precursors in an Ionic Liquid or Propylene Carbonate

“…243°C), and low price should make them interesting, inter alia, for the synthesis of MNPs. [44,[57][58][59][60][61] The synthesis of Cu-and Cu 2 O-NPs by methods such as metal vapor chemistry, [62] plasma electrochemistry, [63,64] photolysis, [65] microemulsion techniques, [66,67] and thermal reduction, [68][69][70][71] has already been described. MW irradiation was used to synthesize flowerlike cuprite (Cu 2 O) architectures.…”

Dimethyl Carbonate: An Eco‐Friendly Solvent in Ruthenium‐Catalyzed Olefin Metathesis Transformations

“…[10] In the field of organometallic catalysis, only a few examples using DMC as a solvent have been reported. [11] Herein, we report that dimethyl carbonate is compatible with ruthenium-catalyzed olefin metathesis reactions. We show that a series of olefin metathesis transformations, including the ethenolysis of methyl oleate, perform equally well in DMC as in dichloromethane or aromatic solvents with various ruthenium catalysts.…”

Improved Palladium‐Catalyzed Sonogashira Coupling Reactions of Aryl Chlorides

“…Propylene carbonate (PC) was first chosen as solvent for the reaction. Its usage in coupling reactions offers several advantages including the possibility of catalyst recycling a) via extraction of the nonpolar product with nonpolar solvents from the reaction mixture [35] or b) as PC can form part of temperature-dependent multicomponent solvent systems (TMS systems). [36] To our delight the reaction proceeded with 1 mol % [PdCl 2 A C H T U N G T R E N N U N G (CH 3 CN) 2 ] and 8 mol % of phosphine ligand L1 in 76 % yield at 90 8C (Table 1, entry 1).…”