01385nas a2200193 4500008004100000245013100041210006900172260000800241300001400249490000800263520066300271100002500934700002500959700001700984700002501001700001901026700001801045856012801063 2006 eng d00aUnusual products in the reactions of phosphorus(III) compounds with N=N, C equivalent to C or conjugated double-bonded systems0 aUnusual products in the reactions of phosphorusIII compounds wit cNOV a495–5010 v1183 a

The diversity of products in the reaction of diethyl azodicarboxylate (DEAD)/diisopropyl azodicarboxylate (DIAD) and activated acetylenes with PIII compounds bearing oxygen or nitrogen substituents is discussed. New findings that are useful in understanding the nature of intermediates involved in the Mitsunobu reaction are highlighted. X-ray structures of two new compounds (2-t-Bu-4-MeC6H3O)P (μ-N-t-Bu)2P+[(NH-t-Bu)N[(CO2]-i-Pr)(HNCO2-i-Pr)]](Cl-)(2-t-Bu-4-MeC6H3OH)(23)and [CH2(6-t-Bu-4-Me-C6H2O)2P(O)C(CO2Me)C-(CO2Me)CClNC(O)Cl] (33) are also reported. The structure of23 is close to one of the intermediates proposed in the Mitsunobu reaction.

1 aSwamy, K., C. Kumara1 aBalaraman, Ekambaram1 aPavan, Phani1 aKumar, N., N. Bhuvan1 aKumar, Praveen1 aKumar, Satish uhttp://library.ncl.res.in/content/unusual-products-reactions-phosphorusiii-compounds-nn-c-equivalent-c-or-conjugated-double01002nas a2200157 4500008004100000245008500041210006900126260000800195300001800203490000800221520043300229100002500662700002400687700002000711856011300731 2011 eng d00aUnprecedented catalytic hydrogenation of urea derivatives to amines and methanol0 aUnprecedented catalytic hydrogenation of urea derivatives to ami cDEC a11906–119090 v1233 a

Indirekte CO2-Hydrierung: Eine Hydrierung von Harnstoffen zu Aminen und Methanol (siehe Bild) wird durch einen RuII-Pinzettenkomplex mit dreizähnigem bipyridinbasiertem PNN-Liganden katalysiert und verläuft unter milden, neutralen Bedingungen bei einem H2-Druck von 13.6 atm. Da sich Harnstoffderivate ausgehend von CO2 erhalten lassen, ermöglicht dieser Ansatz die indirekte Hydrierung von Kohlendioxid zu Methanol.

1 aBalaraman, Ekambaram1 aBen-David, Yehoshoa1 aMilstein, David uhttp://library.ncl.res.in/content/unprecedented-catalytic-hydrogenation-urea-derivatives-amines-and-methanol01645nas a2200169 4500008004100000245011600041210006900157260000800226520097300234100002001207700002801227700002401255700002501279700002801304700001601332856012701348 2012 eng d00aUse of ruthenium complexes for formation and/or hydrogenation of amides and related carboxylic acid derivatives0 aUse of ruthenium complexes for formation andor hydrogenation of  cMAR3 a

A process for preparing amides by reacting a primary amine and a primary alcohol in the presence of a Ruthenium complex to generate the amide and molecular hydrogen. Primary amines are directly acylated by equimolar amounts of alcohols to produce amides and molecular hydrogen (the only byproduct) in high yields and high turnover numbers. Also disclosed are processes for hydrogenation of amides to alcohols and amines; hydrogenation of organic carbonates to alcohols; hydrogenation of carbamates or urea derivatives to alcohols and amines; amidation of esters; acylation of alcohols using esters; coupling of alcohols with water and a base to form carboxylic acids; dehydrogenation of beta-amino alcohols to form pyrazines and cyclic dipeptides; and dehydrogenation of secondary alcohols to ketones. These reactions are catalyzed by a Ruthenium complex which is based on a dearomatized PNN-type ligand of formula A1 or precursors thereof of formulae A2 or A3.

1 aMilstein, David1 aGunanathan, Chidambaram1 aBen-David, Yehoshoa1 aBalaraman, Ekambaram1 aGnanaprakasam, Boopathy1 aZhang, Jing uhttp://library.ncl.res.in/content/use-ruthenium-complexes-formation-andor-hydrogenation-amides-and-related-carboxylic-acid01320nas a2200181 4500008004100000022001400041245008800055210006900143260000900212300001400221490000700235520069700242100002100939700002000960700002200980700002501002856011101027 2017 eng d a1463-926200aUnified strategy for silver-, base-, and oxidant-free direct arylation of C-H bonds0 aUnified strategy for silver base and oxidantfree direct arylatio cMAY  a2111-21170 v193 a

Here, we report a dual catalytic approach for room temperature direct arylation of C-H bonds with aryldiazonium salts as a simple aryl group donor, also working as an internal oxidant via C-N-2 bond cleavage. This unified strategy has been achieved by the synergistic combination of visible-light metal-free photoredox and palladium catalysis under silver-, base-and/or additive-free conditions. The broad substrate scope, functional group tolerance, excellent regioselectivity and redox-neutral conditions of this process make it attractive for the effective synthesis of a wide range of important N-heterocyclic commodities such as dibenzo [b,d]azepine, carbazole and phenanthridine.

1 aSahoo, Manoj, K.1 aMidya, Siba, P.1 aLandge, Vinod, G.1 aBalaraman, Ekambaram uhttp://library.ncl.res.in/content/unified-strategy-silver-base-and-oxidant-free-direct-arylation-c-h-bonds