02118nas a2200229 4500008004100000022001400041245010000055210006900155260010600224300001400330490000700344520125800351653001401609653001401623653001501637653002401652653001301676100002201689700002501711700002201736856013001758 2007 eng d a0014-305700aNitration and amination of polyphenylene oxide: synthesis, gas sorption and permeation analysis0 aNitration and amination of polyphenylene oxide synthesis gas sor aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcAPR a1450-14590 v433 a

A high degree of nitration of polyphenylene oxide (PPO) was successfully achieved by carefully optimizing synthetic protocol. The reduction of nitro group to amino could be done quantitatively. The physical properties of formed polymers were investigated and correlated with gas sorption and permeation properties. The formed polymers were amorphous in nature as revealed by wide angle X-ray diffraction spectra. An increase in the packing density in comparison to unsubstituted PPO as a result of induced polarity was indicated by lowering of fractional free volume and d-spacing. The substitution by either nitro or amino group increased the chain stiffness as revealed by the dynamic mechanical analysis. Though both, nitro and amino group substitution on PPO led to a decrease in pure gas permeability, the selectivity of various gas pairs was increased by these substitutions. The gas sorption analysis revealed that both, solubility selectivity and diffusivity selectivity were increased by these polar group substitutions. The nitro group substitution was more effective in improving solubility selectivity, while amino group substitution was more effective in improving diffusivity selectivity. (C) 2007 Elsevier Ltd. All rights reserved.

10aAmination10anitration10apermeation10apolyphenylene oxide10aSorption1 aBhole, Yogesh, S.1 aKaradkar, Prasad, B.1 aKharul, Ulhas, K. uhttps://library.ncl.res.in/content/nitration-and-amination-polyphenylene-oxide-synthesis-gas-sorption-and-permeation-analysis02272nas a2200229 4500008004100000022001400041245012300055210006900178260007300247300001000320490000800330520141000338653001401748653001701762653001101779653002801790653002501818100002501843700002101868700002901889856012401918 2010 eng d a0926-860X00aHeterogenized copper catalysts for the amination of arylhalide: synthesis, characterization and catalytic applications0 aHeterogenized copper catalysts for the amination of arylhalide s aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJAN a73-810 v3723 a

This research investigated the synthesis, characterization and catalytic activity of heterogenized copper complexes for the selective amination of aryl halides. Amination reactions using homogeneous copper catalyst systems are not generally selective and it is also difficult to recover the catalyst from the homogeneous system for recycling. To overcome these difficulties, our efforts were directed towards the development of cheaper heterogeneous catalyst systems, which can be easily recovered and recycled. Heterogenized analogs of the homogenous Cu complexes were prepared using two methods: (a) encapsulation of copper complexes in zeolite-Y and (b) tethering of copper complexes on various supports like zeolite-Y, silica, charcoal, or clay. The encapsulated and tethered copper catalysts on zeolite-Y were characterized using EPR, Diffused reflectance UV-vis, XRD, IAS, ICPES, SEM, and TEM. The results confirmed that the copper complexes were truly heterogenized in zeolite-Y support. Encapsulated and tethered copper complexes were tested for amination of aryl iodide. The effects of various reaction parameters were examined using tethered Cu(Phen)(PPh(3))Br-PTA-Y catalyst to determine optimum conditions. A recycle study of encapsulated and tethered Cu catalyst was carried out to test their robustness for possible commercial exploitation. (C) 2009 Elsevier B.V. All rights reserved.

10aAmination10aC-N coupling10aCopper10aheterogeneous catalysis10amesoporous materials1 aPatil, Nandkumar, M.1 aGupte, Sunil, P.1 aChaudhari, Raghunath, V. uhttps://library.ncl.res.in/content/heterogenized-copper-catalysts-amination-arylhalide-synthesis-characterization-and-001129nas a2200229 4500008004100000022001400041245009900055210006900154260007500223300001400298490000700312520030800319653001400627653001400641653001900655653001600674653002300690653002000713100002000733700001900753856012700772 2014 eng d a0936-521400aCroncise organocatalytic route to protected (2S, 4R)-4-hydroxyornithine and(+)-pseudohygroline0 aCroncise organocatalytic route to protected 2S 4R4hydroxyornithi aRUDIGERSTR 14, D-70469 STUTTGART, GERMANYbGEORG THIEME VERLAG KGcMAY a1089-10920 v253 a

A practical, efficient, and organocatalytic approach to the synthesis of (2S,4R)-4-hydroxyornithine and (+)-pseudohygroline is reported using proline-catalyzed sequential alpha-aminoxylation/alpha-amination reaction and Horner-Wadsworth-Emmons olefination reaction of an aldehyde as the key step.

10aaldehydes10aAmination10aAmino alcohols10acyclization10aEnantioselectivity10aWittig reaction1 aJha, Vishwajeet1 aKumar, Pradeep uhttps://library.ncl.res.in/content/croncise-organocatalytic-route-protected-2s-4r-4-hydroxyornithine-and-pseudohygroline-001199nas a2200217 4500008004100000022001400041245012700055210006900182260007700251300001400328520034900342653001400691653001400705653001900719653002200738653002100760100002000781700003200801700001900833856012900852 2014 eng d a1434-193X00aStereoselective approach to 2,6-disubstituted piperidin-3-ol: synthesis of (-)-deoxoprosopinine and (+)-deoxoprosophylline0 aStereoselective approach to 26disubstituted piperidin3ol synthes aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcAUG a4897-49023 a

A simple and highly efficient approach to an enantioenriched 2,6-disubstituted piperidin-3-ol skeleton is developed from an aldehyde as a starting material by using organocatalytic and asymmetric dihydroxylation as the key steps. Its application to the total synthesis of (-)-deoxoprosopinine and (+)-deoxoprosophylline is also reported.

10aalkaloids10aAmination10aAmino alcohols10asynthetic methods10aWittig reactions1 aJha, Vishwajeet1 aKauloorkar, Shruti, Vandana1 aKumar, Pradeep uhttps://library.ncl.res.in/content/stereoselective-approach-26-disubstituted-piperidin-3-ol-synthesis-deoxoprosopinine-and-001437nas a2200229 4500008004100000022001400041245017700055210006900232260007500301300001400376490000700390520052700397653001400924653002300938653002000961653001200981653001800993100002501011700002601036700002201062856012301084 2016 eng d a0936-521400aFormal enantioselective synthesis of (-)-epiquinamide by proline-catalyzed one-pot sequential -amination/propargylation of aldehyde and asymmetric dihydroxylation of olefin0 aFormal enantioselective synthesis of epiquinamide by prolinecata aRUDIGERSTR 14, D-70469 STUTTGART, GERMANYbGEORG THIEME VERLAG KGcJUL a1699-17020 v273 a

Two independent routes to the formal synthesis of (-)-epiquinamide, have been described: the first route utilizes an l-proline-catalyzed one-pot sequential -amination/propargylation of aldehyde, while the second one employs asymmetric dihydroxylation as the key reaction to install the stereochemistry. While the first synthesis was accomplished in nine steps with 24.4% overall yield and dr 9:1, the second strategy resulted in the synthesis in eight steps with 36.4% overall yield and with perfect enantiocontrol.

10aAmination10adiastereoselective10aDihydroxylation10aProline10aquinolizidine1 aAhuja, Brij, Bhushan1 aEmmanuvel, Lourdusamy1 aSudalai, Arumugam uhttps://library.ncl.res.in/content/formal-enantioselective-synthesis-epiquinamide-proline-catalyzed-one-pot-sequential01537nas a2200361 4500008004100000022001400041245007800055210006900133260000800202300001400210490000700224520045500231653002800686653001300714653001400727653001100741653001300752653002000765653002100785653003900806653002400845653002600869653001200895653001700907653001900924653002300943653002500966100002000991700001801011700001801029700002501047856010301072 2017 eng d a0039-788100aSimple cobalt(II) chloride catalyzed N-alkylation of amines with alcohols0 aSimple cobaltII chloride catalyzed Nalkylation of amines with al cSEP a3957-39610 v493 a

A facile cobalt-catalyzed N-alkylation of amines with alcohols using inexpensive, commercially available CoCl2 center dot 6H(2)O is reported. Employing this readily available cobalt catalyst, a variety of amines with wide functional group tolerance were selectively alkylated under benign conditions.

10a(Hetero)Aromatic Amines10aAlcohols10aAmination10aamines10aAnilines10aAromatic-amines10aCobalt Catalysis10aDehydrogenation Borrowing Hydrogen10aEfficient Catalysts10aHydrogen Autotransfer10aIridium10aN-alkylation10aPincer-complex10aSecondary Alcohols10aSelective Alkylation1 aMidya, Siba, P.1 aMondal, Akash1 aBegum, Ayesha1 aBalaraman, Ekambaram uhttps://library.ncl.res.in/content/simple-cobaltii-chloride-catalyzed-n-alkylation-amines-alcohols