00940nas a2200181 4500008004100000245008000041210006900121260000800190300001600198490000700214520030700221100003000528700002400558700002400582700002000606700002500626856010700651 2015 eng d00aWell-defined palladium(II) complexes for ligand enabled C(sp3)-alkynylation0 aWelldefined palladiumII complexes for ligand enabled Csp3alkynyl cJUL a15382-153860 v443 a

The first example of ligand-enabled C(sp3)-alkynylation of 8-methylquinoline is reported. The reaction is catalysed by well-defined Pd(II) complexes. The present C(sp3)-alkynylation has a broad substrate scope as well as functional group tolerance and proceeds efficiently under mild conditions.

1 aLandge, Vinod, Gokulkrish1 aSahoo, Manoj, Kumar1 aMidya, Siba, Prasad1 aJaiswal, Garima1 aBalaraman, Ekambaram uhttps://library.ncl.res.in/content/well-defined-palladiumii-complexes-ligand-enabled-csp3-alkynylation00978nas a2200157 4500008004100000245008100041210007100122260000800193300001400201490000700215520040800222100003000630700002000660700002500680856011500705 2016 eng d00aCobalt-catalyzed bis-alkynylation of amides via double C–H bond activation0 aCobaltcatalyzed bisalkynylation of amides via double C–H bond ac cFEB a812–8150 v183 a

The first example of cobalt-catalyzed selective bis-alkynylation of amides via double C–H bond activation with the directing assistance of a removable bidentate auxiliary is reported. The developed alkynylation strategy is simple, efficient, and tolerant of various functional groups including ether, amine, halides, and heterocyclic motifs. The reaction can be scaled up under mild conditions.

1 aLandge, Vinod, Gokulkrish1 aJaiswal, Garima1 aBalaraman, Ekambaram uhttps://library.ncl.res.in/content/cobalt-catalyzed-bis-alkynylation-amides-double-c%E2%80%93h-bond-activation02039nas a2200265 4500008004100000022001400041245013000055210006900185260007100254300001600325490000600341520103000347653001901377653003001396653001801426653002101444653001901465653003701484100002601521700002301547700002001570700002301590700002901613856013101642 2016 eng d a1944-824400aEarth abundant iron-rich N-doped graphene based spacer and cavity materials for surface plasmon-coupled emission enhancements0 aEarth abundant ironrich Ndoped graphene based spacer and cavity  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAY a12324-123290 v83 a

We demonstrate for the first time the use of Fe based nanoparticles on N-doped graphene as spacer and cavity materials and study their plasmonic effect on the spontaneous emission of a radiating dipole. Fe-C-MF was produced by pyrolizing FeOOH and melamine formaldehyde precursor on graphene, while Fe-C-PH was produced by pyrolizing the Fe-phenanthroline complex on graphene. The use of the Fe-C-MF composite consisting of Fe-rich crystalline phases supported on N-doped graphene presented a spacer material with 116-fold fluorescence enhancements. On the other hand, the Fe-C-PH/Ag based cavity resulted in an 82-fold enhancement in Surface Plasmon-Coupled Emission (SPCE), with high directionality and polarization of Rhodamine 6G (Rh6G) emission owing to Casimir and Purcell effects. The use of a mobile phone as a cost-effective fluorescence detection device in the present work opens up a flexible perspective for the study of different nanomaterials as tunable substrates in cavity mode and spacer applications.

10aCasimir effect10afluorescence enhancements10airon carbides10aN-doped graphene10aPurcell factor10asurface plasmon-coupled emission1 aSrinivasan, Venkatesh1 aVernekar, Dnyanesh1 aJaiswal, Garima1 aJagadeesan, Dinesh1 aRamamurthy, Sai, Sathish uhttps://library.ncl.res.in/content/earth-abundant-iron-rich-n-doped-graphene-based-spacer-and-cavity-materials-surface-plasmon01259nas a2200193 4500008004100000245015300041210006900194260000800263300001400271490000600285520048300291100003000774700002500804700002000829700002400849700002400873700002500897856014300922 2016 eng d00aNickel-catalyzed direct alkynylation of C(sp2)-H bonds of amides: an “inverse sonogashira strategy” to ortho-alkynylbenzoic acids. just accepted0 aNickelcatalyzed direct alkynylation of Csp2H bonds of amides an  cOCT a1946-19510 v63 a

Nickel-catalyzed direct alkynylation of C(sp2)–H bonds of amides using commercially available, inexpensive 8-aminoquinoline as a removable bidentate directing group is described. The present ortho-alkynylation has a broad substrate scope, functional group tolerance and high regiocontrol, and can be scaled up. The efficiency and selectivity of this strategy provide sustainable routes to a diverse array of ortho-alkynylbenzoic acids under Ni(II)-catalyzed conditions.

1 aLandge, Vinod, Gokulkrish1 aShewale, Chinmay, H.1 aJaiswal, Garima1 aSahoo, Manoj, Kumar1 aMidya, Siba, Prasad1 aBalaraman, Ekambaram uhttps://library.ncl.res.in/content/nickel-catalyzed-direct-alkynylation-csp2-h-bonds-amides-%E2%80%9Cinverse-sonogashira-strategy%E2%80%9D01188nas a2200169 4500008004100000245011900041210006900160260000800229300001400237490000700251520053500258100002000793700003000813700002300843700002500866856012700891 2016 eng d00aSustainable Iron-catalyzed direct imine formation by acceptorless dehydrogenative coupling of alcohols with amines0 aSustainable Ironcatalyzed direct imine formation by acceptorless cMAY a3232-32380 v183 a

The Acceptorless Dehydrogenative Coupling (ADC) of alcohols with amines is reported using a heterogeneous Fe-catalyst. The reaction operates under mild conditions with the liberation of dihydrogen and water as the byproducts. The developed ADC strategy is simple, efficient, exhibits wide functional group tolerance and can be scaled up. The present catalytic approach possesses a dual role; acting as a catalyst as well as being magnetically separable. The sustainable reuse of a heterogeneous iron catalyst is also shown.

1 aJaiswal, Garima1 aLandge, Vinod, Gokulkrish1 aJagadeesan, Dinesh1 aBalaraman, Ekambaram uhttps://library.ncl.res.in/content/sustainable-iron-catalyzed-direct-imine-formation-acceptorless-dehydrogenative-coupling01693nas a2200169 4500008004100000245007500041210006900116260000800185300002500193490000600218520110700224100002001331700002201351700002301373700002501396856010201421 2017 eng d00aIron-based nanocatalyst for the acceptorless dehydrogenation reactions0 aIronbased nanocatalyst for the acceptorless dehydrogenation reac cDEC aArticle Number: 21470 v83 aDevelopment of sustainable catalytic systems for fundamentally important synthetic transformations and energy storage applications is an intellectually stimulating challenge. Catalytic dehydrogenation of feedstock chemicals, such as alcohols and amines to value-added products with the concomitant generation of dihydrogen is of much interest in the context of hydrogen economy and is an effective alternative to the classical oxidation reactions. Despite a number of homogeneous catalysts being identified for the acceptorless dehydrogenation, the use of high price and limited availability of precious metals and poor recovery of the catalyst have spurred interest in catalysis with more earth-abundant alternatives, especially iron. However, no report has described a reusable iron-based heterogeneous catalyst for oxidant-free and acceptorless dehydrogenation reactions. Here we replace expensive noble metal catalysts with an inexpensive, benign, and sustainable nanoscale iron catalyst for the efficient acceptorless dehydrogenation of N-heterocycles and alcohols with liberation of hydrogen gas.1 aJaiswal, Garima1 aLandge, Vinod, G.1 aJagadeesan, Dinesh1 aBalaraman, Ekambaram uhttps://library.ncl.res.in/content/iron-based-nanocatalyst-acceptorless-dehydrogenation-reactions02097nas a2200169 4500008004100000245010400041210006900145260000800214300001400222490000600236520146300242100002501705700003001730700002001760700002101780856012601801 2017 eng d00aIron-catalyzed dehydrogenation reactions and their applications in sustainable energy and catalysis0 aIroncatalyzed dehydrogenation reactions and their applications i cAUG a3177-31950 v73 aInspired by nature, chemists have designed new catalysts in the pursuit of selective bond activation and chemical transformations. Emergent biological systems often use earth-abundant first-row transition elements as catalytically active sites to facilitate specific and highly selective chemical processes. The design of a new catalytic system based on abundant and inexpensive catalysts, particularly the iron-based catalysts, for fundamentally significant synthetic transformations under environmentally benign conditions is an important paradigm in chemical synthesis. In recent times, iron-based catalytic systems have shown unprecedented reactivity in the acceptorless dehydrogenation reactions of feedstock chemicals, with the liberation of molecular hydrogen as the by-product, and have enabled greener chemical synthetic methods and alternative energy storage systems. Indeed, it has been demonstrated that the proper design of iron catalysts by judiciously choosing ligands, can aid in the development of new sustainable energy storage systems and catalysis. This tutorial review focuses on the recent development of iron-based dehydrogenation reactions of fundamentally important feedstock, as a route to sustainable chemical synthesis and energy storage applications. The emerging area of the iron-based dehydrogenation strategy provides an opportunity to make industrially applicable, cost-effective and environmentally benign catalytic systems.1 aBalaraman, Ekambaram1 aNandakumar, Avanashiappan1 aJaiswal, Garima1 aSahoo, Manoj, K. uhttps://library.ncl.res.in/content/iron-catalyzed-dehydrogenation-reactions-and-their-applications-sustainable-energy-and01063nas a2200169 4500008004100000245007600041210006900117260000800186300001600194490000700210520048200217100002100699700002000720700002000740700002500760856010800785 2017 eng d00aOrgano-photoredox catalyzed oxidative dehydrogenation of N-heterocycles0 aOrganophotoredox catalyzed oxidative dehydrogenation of Nheteroc cOCT a14167-141720 v233 aWe report here for the first time the catalytic oxidative dehydrogenation of N-heterocycles by a visible-light organo-photoredox catalyst with low catalyst loading (0.1-1mol%). The reaction proceeds efficiently under base- and additive-free conditions with ambient air at room temperature. The utility of this benign approach is demonstrated by the synthesis of various pharmaceutically relevant N-heteroarenes such as quinoline, quinoxaline, quinazoline, acridine, and indole.1 aSahoo, Manoj, K.1 aJaiswal, Garima1 aRana, Jagannath1 aBalaraman, Ekambaram uhttps://library.ncl.res.in/content/organo-photoredox-catalyzed-oxidative-dehydrogenation-n-heterocycles01928nas a2200241 4500008004100000022001400041245009800055210006900153260000800222300001400230490000600244520110600250653003301356653001601389653001901405653001301424653002501437100002101462700003101483700002001514700002501534856012701559 2018 eng d a2155-543500aPhotocatalysis enabling acceptorless dehydrogenation of diaryl hydrazines at room temperature0 aPhotocatalysis enabling acceptorless dehydrogenation of diaryl h cAUG a7727-77330 v83 a

Aromatic azo compounds are privileged structural motifs, and they exhibit a myriad of pharmaceutical as well as industrial applications. Here, we report a catalytic acceptorless dehydrogenation of diarylhydrazine derivatives to access a wide variety of aryl-azo compounds with the removal of molecular hydrogen as the sole byproduct. This distinctive reactivity has been achieved under dual catalytic conditions by merging the visible-light active [Ru(bpy)(3)](2+) as the photoredox catalyst and Co(dmgH)(2)(py)Cl as the proton-reduction catalyst. The reaction proceeds smoothly under very mild and benign conditions and operates at ambient temperature. This dual catalytic approach is highly compatible with many different functional groups and has a broad substrate scope. We have also demonstrated the reversible hydrogen storage and release phenomenon on hydrazobenzene/azobenzene couple to show the utility of these compounds as hydrogen storage materials. Further diversification of azobenzene was shown by a transition metal-catalyzed azo-group-directed ortho-C-H bond functionalization.

10aacceptorless dehydrogenation10aAzo benzene10adual catalysis10aHydrogen10aphotoredox catalysis1 aSahoo, Manoj, K.1 aSaravanakumar, Krishnasamy1 aJaiswal, Garima1 aBalaraman, Ekambaram uhttps://library.ncl.res.in/content/photocatalysis-enabling-acceptorless-dehydrogenation-diaryl-hydrazines-room-temperature01362nas a2200169 4500008004100000245010900041210006900150260000800219300001400227490000700241520072800248100002000976700002600996700002101022700002501043856012401068 2019 eng d00aReusable cobalt catalyst for reversible acceptorless dehydrogenation and hydrogenation of N-Heterocycles0 aReusable cobalt catalyst for reversible acceptorless dehydrogena cMAY a2449-24570 v113 a

The development of robust catalytic systems based on basemetals for reversible acceptorless dehydrogenation (ADH) and hydrogenation of feedstock chemicals is very important in the context of ` hydrogen storage'. Herein, we report a highly efficient reusable cobalt-based heterogeneous catalyst for reversible dehydrogenation and hydrogenation of N-heterocycles. Both the ADH and the hydrogenation processes operate under mild, benign conditions.

1 aJaiswal, Garima1 aSubaramanian, Murugan1 aSahoo, Manoj, K.1 aBalaraman, Ekambaram uhttps://library.ncl.res.in/content/reusable-cobalt-catalyst-reversible-acceptorless-dehydrogenation-and-hydrogenation-n