01032nas a2200193 4500008004100000022001400041245009800055210006900153260011000222300001400332490000700346520024600353100002100599700002100620700002000641700002000661700003100681856012600712 2013 eng d a1359-734500aElectron rich porous extended framework as a heterogeneous catalyst for Diels-Alder reactions0 aElectron rich porous extended framework as a heterogeneous catal aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJUN a7439-74410 v493 a

An electron rich porous metal-organic framework (MOF) has been synthesized, which acts as an effective heterogeneous catalyst for Diels-Alder reactions through encapsulation of the reactants in confined nano-channels of the framework.

1 aGole, Bappaditya1 aBar, Arun, Kumar1 aMallick, Arijit1 aBanerjee, Rahul1 aMukherjee, Partha, Sarathi uhttps://library.ncl.res.in/content/electron-rich-porous-extended-framework-heterogeneous-catalyst-diels-alder-reactions-003975nas a2200205 4500008004100000022001400041245008600055210007400141260000800215300001400223490000700237520326500244100002803509700002303537700002303560700002103583700001803604700002303622856012403645 2021 eng d a1523-706000aEvidence of an nN(amide) → π*Ar interaction in N-Alkyl-N,N′-diacylhydrazines0 aEvidence of an nNamide → πAr interaction in NAlkylNN′diacylhydra cMAY a7003-70070 v233 a

1,2-Dibenzoyl-1-tert-butylhydrazine (RH-5849) and related N-alkyl-N,N′-diacylhydrazines are environmentally benign insect growth regulators. Herein, we show that an unusual nN(amide) → π*Ar interaction mediated by a hydrazide amide nitrogen atom plays a crucial role in stabilizing their biologically active trans–cis (t–c) rotameric conformations. We provide NMR and IR spectroscopic evidence for the presence of these interactions, which is also supported by X-ray crystallographic and computational studies.

1 aDeka, Jugal, Kishore Ra1 aSahariah, Biswajit1 aSakpal, Sushil, S.1 aBar, Arun, Kumar1 aBagchi, Sayan1 aSarma, Bani, Kanta uhttps://library.ncl.res.in/content/evidence-nnamide-%E2%86%92-%CF%80ar-interaction-n-alkyl-nn%E2%80%B2-diacylhydrazines01406nas a2200217 4500008004100000022001400041245010200055210006900157260000900226300001400235490000700249520064500256100002000901700002300921700002300944700002800967700002100995700001801016700002301034856013101057 2021 eng d a1523-706000aStabilization of Azapeptides by N-amide center dot center dot center dot H-N-amide Hydrogen Bonds0 aStabilization of Azapeptides by Namide center dot center dot cen cJUL  a4949-49540 v233 aAn unusual N-amide center dot center dot center dot H-Namide hydrogen bond (HB) was previously proposed to stabilize the azapeptide beta-turns. Herein we provide experimental evidence for the N-amide center dot center dot center dot H-Namide HB and show that this HB endows a stabilization of 1-3 kcal.mol(-1) and enforces the trans-cis-trans (t-c-t) and cis-cis-trans (c-c-t) amide bond conformations in azapeptides and N-methyl-azapeptides, respectively. Our results indicate that these N-amide center dot center dot center dot H-Namide HBs can have stabilizing contributions even in short azapeptides that cannot fold to form beta-turns.1 aBaruah, Kalpita1 aSahariah, Biswajit1 aSakpal, Sushil, S.1 aDeka, Jugal, Kishore Ra1 aBar, Arun, Kumar1 aBagchi, Sayan1 aSarma, Bani, Kanta uhttps://library.ncl.res.in/content/stabilization-azapeptides-n-amide-center-dot-center-dot-center-dot-h-n-amide-hydrogen-bonds