Additional pitfalls of using 1,1-ADEQUATE for structure elucidation.

1,1-ADEQUATE is a powerful and robust NMR experiment to establish carbon-carbon connectivities using modest sample quantities when cryogenic probe technology is available. Yet potential pitfalls of applying this method are not widely appreciated, such as weak or missing 1 JCC correlations in strongly coupled 13 C-13 C AB spin systems and unusually large multi-bond (n JCC ) correlations associated with particular functional groups. These large n JCC correlations observed in 1,1-ADEQUATE spectra could be mistaken for 1 JCC correlations. Copyright © 2016 John Wiley & Sons, Ltd.

Photoredox-Catalyzed Hydroxymethylation of Heteroaromatic Bases.

We report the development of a method for room-temperature C-H hydroxymethylation of heteroarenes. A key enabling advance in this work was achieved by implementing visible light photoredox catalysis that proved to be applicable to many classes of heteroarenes and tolerant of diverse functional groups found in druglike molecules.

Tandem amine and ruthenium-catalyzed hydrogenation of CO2 to methanol.

This Communication describes the hydrogenation of carbon dioxide to methanol via tandem catalysis with dimethylamine and a homogeneous ruthenium complex. Unlike previous examples with homogeneous catalysts, this CO2-to-CH3OH process proceeds under basic reaction conditions. The dimethylamine is proposed to play a dual role in this system. It reacts directly with CO2 to produce dimethylammonium dimethylcarbamate, and it also intercepts the intermediate formic acid to generate dimethylformamide. With the appropriate selection of catalyst and reaction conditions, >95% conversion of CO2 was achieved to form a mixture of CH3OH and dimethylformamide.

Reversible carbon-carbon bond formation between carbonyl compounds and a ruthenium pincer complex.

This communication describes the reversible reaction of a ruthenium pincer complex with a variety of carbonyl compounds. Both NMR spectroscopic and X-ray crystallographic characterization of isomeric carbonyl adducts are reported, and the equilibrium constants for carbonyl binding have been determined.

Cascade catalysis for the homogeneous hydrogenation of CO2 to methanol.

This communication demonstrates the homogeneous hydrogenation of CO(2) to CH(3)OH via cascade catalysis. Three different homogeneous catalysts, (PMe(3))(4)Ru(Cl)(OAc), Sc(OTf)(3), and (PNN)Ru(CO)(H), operate in sequence to promote this transformation.

A highly effective cobalt catalyst for olefin aziridination with azides: hydrogen bonding guided catalyst design.

[Co(P1)], which was designed on the basis of potential hydrogen-bonding interactions in the metal-nitrene intermediate, is a highly active aziridination catalyst with azides. [Co(P1)] can effectively aziridinate various aromatic olefins with arylsulfonyl azides under mild conditions, forming sulfonylated aziridines in excellent yields. The Co-based system enjoys several attributes associated with the relatively low cost of cobalt and the wide accessibility of arylsulfonyl azides. Furthermore, it generates stable dinitrogen as the only byproduct.