01612nas a2200241   4500008004100000022001400041245012100055210006900176260005700245300001200302490000800314520069700322653002501019653003801044653001201082653001601094100002901110700002501139700002401164700002501188700002901213856012801242       2010                        eng d  a1011-372X00aCatalytic asymmetric transfer hydrogenation of ketones using [Ru(p-cymene)Cl-2](2) with chiral amino alcohol ligands0 aCatalytic asymmetric transfer hydrogenation of ketones using Rup  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcSEP  a231-2380 v1383 a<p>Catalytic asymmetric transfer hydrogenation of aromatic alkyl ketones has been investigated using [Ru(p-cymene)Cl-2](2) and new derivatives of beta-amino alcohols synthesized from (S)-(-)-lactic acid and mandelic acid as ligands. Chiral secondary alcohols were obtained with good to excellent conversion (60-90%) and moderate to good enantioselectivities (40-86%). Asymmetric transfer hydrogenation of ketones has been investigated using [Ru(p-cymene)Cl-2](2) and beta-amino alcohols synthesized from (S)-(-)-lactic acid and Mandelic acid as ligands. Chiral secondary alcohols were obtained with good to excellent conversion (60-90%) and moderate to good enantioselectivities (40-86%).</p>10aAmino alcohol ligand10aAsymmetric transfer hydrogenation10aKetones10aRu catalyst1 aDeshpande, Sudhindra, H.1 aKelkar, Ashutosh, A.1 aGonnade, Rajesh, G.1 aShingote, Savita, K.1 aChaudhari, Raghunath, V.  uhttps://library.ncl.res.in/content/catalytic-asymmetric-transfer-hydrogenation-ketones-using-rup-cymenecl-22-chiral-amino-001301nas a2200205   4500008004100000022001400041245012700055210006900182260011000251300001600361490000600377520043700383100002500820700002500845700002900870700002400899700001700923700002500940856013000965       2014                        eng d  a2046-206900aAsymmetric transfer hydrogenation of imines in water/methanol co-solvent system and mechanistic investigation by DFT study0 aAsymmetric transfer hydrogenation of imines in watermethanol cos  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcSEP  a46351-463560 v43 a<p>Asymmetric transfer hydrogenation of various cyclic imines proceeded efficiently with water/methanol co-solvent media in 20 min with excellent yields and enantioselectivities by employing Rh-TsDPEN catalyst and sodium formate as a hydrogen donor. The role of the co-solvent in enhanced productivity of the reaction was investigated by DFT. The mechanism for ATH of the imines has been discussed on the basis of the DFT study.</p>1 aShende, Vaishali, S.1 aShingote, Savita, K.1 aDeshpande, Sudhindra, H.1 aKuriakose, Nishamol1 aVanka, Kumar1 aKelkar, Ashutosh, A.  uhttps://library.ncl.res.in/content/asymmetric-transfer-hydrogenation-imines-watermethanol-co-solvent-system-and-mechanistic-001385nas a2200193   4500008004100000022001400041245011000055210006900165260007100234300001400305490000700319520061700326100002500943700002900968700002500997700001601022700002501038856012801063       2015                        eng d  a1523-706000aAsymmetric transfer hydrogenation of imines in water by varying the ratio of formic acid to triethylamine0 aAsymmetric transfer hydrogenation of imines in water by varying   a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJUN  a2878-28810 v173 a<p>Asymmetric transfer hydrogenation (ATH) of imines has been performed with variation in formic acid (F) and triethylamine (T) molar ratios in water. The F/T ratio is shown to affect both the reduction rate and enantioselectivity, with the optimum ratio being 1.1 in the ATH of imines with the Rh-(1S,2S)-TsDPEN catalyst. Use of methanol as a cosolvent enhanced reduction activity. A variety of imine substrates have been reduced, affording high yields (94-98%) and good to excellent enantioselectivities (89-98%). In comparison with the common azeotropic F-T system, the reduction with 1.1/1 F/T is faster.</p>1 aShende, Vaishali, S.1 aDeshpande, Sudhindra, H.1 aShingote, Savita, K.1 aJoseph, Anu1 aKelkar, Ashutosh, A.  uhttps://library.ncl.res.in/content/asymmetric-transfer-hydrogenation-imines-water-varying-ratio-formic-acid-triethylamine-002588nas a2200217   4500008004100000022001400041245013100055210006900186260011000255300001600365490000600381520166900387100002902056700002502085700002502110700003102135700002602166700002902192700002502221856012402246       2015                        eng d  a2046-206900aRhodium complex with unsymmetrical vicinal diamine ligand: excellent catalyst for asymmetric transfer hydrogenation of ketones0 aRhodium complex with unsymmetrical vicinal diamine ligand excell  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJUN  a51722-517290 v53 a<p>New unsymmetrical vicinal diamine ligands with systematic variation in the regio and stereo positions in the amine and sulphonamide groups were synthesized from cheap starting material such as norephedrine. Catalytic Asymmetric Transfer Hydrogenation (ATH) of aromatic alkyl ketones has been investigated using transition metal complexes and new derivatives of monotosylated unsymmetrical vicinal diamine ligands using sodium formate as the hydrogen source, in water and methanol. Chiral secondary alcohols were obtained with excellent enantioselectivity (&gt;95% ee) and conversion of ketones (&gt;95%) with [Rh(Cp*)Cl-2](2) and ligand 4 as a catalyst. Enantioselectivity was found to be slightly higher with the use of methanol as a solvent for ATH of ketones with sodium formate as the hydrogen source compared to water as a solvent and was found to be consistent with all the ketones investigated. The reaction mixture is homogeneous in methanol unlike in water, where substrate and product are insoluble in water and form separate phase, sodium formate being soluble in water. The activity and enantioselectivity obtained for ATH of ketones using [Rh(Cp*)Cl-2](2) and unsymmetrical vicinal diamine ligand as catalyst was comparable with the C2 symmetric benchmark ligands like TsDPEN ((1R, 2R)-N-(p-tolylsulfonyl)-1,2-diphenylethylene- diamine), and TsCYDN ((1R, 2R)-N-(p-tolylsulfonyl)-1,2-cyclohexyl, diamine) under similar reaction conditions. To the best of our knowledge, this is first example of the ATH of ketones with good activity and high enantioselectivity with [Rh(Cp*)Cl-2](2) and unsymmetrical vicinal diamine ligands as catalyst systems.</p>1 aDeshpande, Sudhindra, H.1 aShende, Vaishali, S.1 aShingote, Savita, K.1 aChakravarty, Debamitra, K.1 aPuranik, Vedavati, G.1 aChaudhari, Raghunath, V.1 aKelkar, Ashutosh, A.  uhttps://library.ncl.res.in/content/rhodium-complex-unsymmetrical-vicinal-diamine-ligand-excellent-catalyst-asymmetric-001668nas a2200169   4500008004100000245017400041210006900215260000800284300001400292490000600306520095100312100002501263700002501288700002901313700002601342856013001368       2016                        eng d00aAsymmetric transfer hydrogenation of cyclic imines in water with a versatile hydrogen donorformic acid/N-methylpiperidine: rapid access to highly enantioselective amines0 aAsymmetric transfer hydrogenation of cyclic imines in water with  cJUL  a2221-22240 v13 aAsymmetric transfer hydrogenation (ATH) of cyclic imines in water has been investigated for the first time by using HCOOH in combination with bases other than triethylamine as H donor. Effect of FA/Base ratio has shown significant impact on activity and enantioselectivity for ATH reaction in water. Use of methanol as a co-solvent improved the reduction performance. FA/N-methylpiperidine was found to be excellent, versatile hydrogen donor for ATH of imine 6,7-dimethoxy-1-methyl-3,4-dihy-droisoquinoline (1a) giving by far the highest noted TOF value of 5940 h(-1). ATH of-different imines derivatives including 3, 4-dihydoisoquinolines, beta-carbolines and cyclic sulfonyl imines have been performed with excellent activity (91-99% yield) and enantioselectivity (88-97%) in very short time (1-2 min). This is very simple protocol for rapid access to enantioselective amines with very new and versatile hydrogen donor 1.1 FA/Nmethylpiperidine.1 aShende, Vaishali, S.1 aShingote, Savita, K.1 aDeshpande, Sudhindra, H.1 aKelkar, Ashutosh., A.  uhttps://library.ncl.res.in/content/asymmetric-transfer-hydrogenation-cyclic-imines-water-versatile-hydrogen-donorformic-acidn02034nas a2200205   4500008004100000245013200041210006900173260000800242300001500250490000600265520125700271100004001528700001401568700002901582700001901611700001801630700002401648700002601672856013001698       2025                        eng d00aGraphene oxide-cyclopentylamine (GO-d-CP) liquid crystals as a novel alignment medium for anisotropic nmr with analyte recovery0 aGraphene oxidecyclopentylamine GOdCP liquid crystals as a novel   cAPR  ae2024000390 v53 a<p>
	<span style="color: rgb(0, 0, 0); font-family: &quot;Open Sans&quot;, icomoon, sans-serif; font-size: 16px;">In this study, we present graphene oxide derivatized with cyclopentylamine (GO-d-CP) as a DMSO-compatible liquid crystal alignment medium that is free from any background NMR signal for application in anisotropic NMR. This novel alignment medium facilitates optimal isotropic and anisotropic conditions within a single sample preparation, controlled by sonication, thereby enabling the measurement of anisotropic NMR parameters- residual dipolar couplings (RDC) and residual chemical shift anisotropy (RCSA). GO-d-CP offers several advantages, including ease of synthesis, isolation of solid GO-d-CP as a stable non-hygroscopic material, and maintenance of the anisotropic state stability &gt;30 days, allowing for prolonged and repetitive experiments. Notably, post the analysis it allows for easy recovery of valuable analytes as well as GO-d-CP for reuse, enabling the routine application of anisotropic NMR in structural analysis of small molecules. We demonstrate its efficacy by analyzing the relative stereochemistry of four compounds - estrone, santonin, griseofulvin, and cinmethylin - using anisotropic NMR data.</span></p>
1 aJatheendranath, Sandesh, Chickmagal1 aDas, Akhi1 aDeshpande, Sudhindra, H.1 aNath, Nilamoni1 aMaier, Walter1 aStreitferdt, Verena1 aMarelli, Udaya, Kiran  uhttps://library.ncl.res.in/content/graphene-oxide-cyclopentylamine-go-d-cp-liquid-crystals-novel-alignment-medium-anisotropic