01315nas a2200253 4500008004100000022001400041245009800055210006900153260006500222300001200287490000600299520042100305653000600726653000600732653002400738653002700762653002900789100002600818700002600844700002400870700002500894700002600919856011600945 2009 eng d a1895-106600aScolecite as an efficient heterogeneous catalyst for the synthesis of 2,4,5-triarylimidazoles0 aScolecite as an efficient heterogeneous catalyst for the synthes a9 DRUGA POPRZECNA ST, 04-604 WARSAW 41, POLANDbVERSITAcSEP a550-5540 v73 a

Natural scolecite has been found as an effective catalyst for the one-pot synthesis of 2,4,5-triarylimidazole derivatives via a three component reaction using benzil or benzoin, aldehydes and ammonium acetate. This method provides several advantages such as being environmentally benign, reusable, possessing high yields with increased variations of the substituents in the product and preparative simplicity.

10a210a410a5-Triarylimidazoles10aheterogeneous catalyst10aThree-component reaction1 aGadekar, Lakshman, S.1 aMane, Shivshankar, R.1 aKatkar, Santosh, S.1 aArbad, Balasaheb, R.1 aLande, Machhindra, K. uhttps://library.ncl.res.in/content/scolecite-efficient-heterogeneous-catalyst-synthesis-245-triarylimidazoles-001459nas a2200241 4500008004100000022001400041245013500055210006900190260008900259300001400348490000700362520049000369653002700859653002800886653002300914653002200937100002600959700002400985700002601009700002501035700002601060856013101086 2009 eng d a0253-296400aScolecite catalyzed facile and efficient synthesis of polyhydroquinoline derivatives through hantzsch multi-component condensation0 aScolecite catalyzed facile and efficient synthesis of polyhydroq a635-4 YEOGSAM-DONG, KANGNAM-GU, SEOUL 135-703, SOUTH KOREAbKOREAN CHEMICAL SOCcNOV a2532-25340 v303 a

A facile and efficient synthetic route has been developed for the polyhydroquinoline via four component reactions of aldehydes, dimedone, ethyl acetoacetate and ammonium acetate in the presence of catalytic amount of scolecite in ethanol at 70 degrees C through Hantzsch reaction. This method gives remarkable advantages such as simple work-up procedure. environmentally friendly, inexpensive, non-toxic and recyclable catalyst, shorter reaction time along with excellent yields

10aheterogeneous catalyst10aMulticomponent reaction10aPolyhydroquinoline10aReusable catalyst1 aGadekar, Lakshman, S.1 aKatkar, Santosh, S.1 aMane, Shivshankar, R.1 aArbad, Balasaheb, R.1 aLande, Machhindra, K. uhttps://library.ncl.res.in/content/scolecite-catalyzed-facile-and-efficient-synthesis-polyhydroquinoline-derivatives-through-002595nas a2200241 4500008004100000022001400041245016600055210006900221260000900290300001200299490000700311520166800318653004801986653002702034653003802061653002102099653001602120100001902136700002802155700002102183700002602204856012302230 2019 eng d a0887-624X00aNew approach for the synthesis of miktoarm star polymers through a combination of thiol-epoxy ``click'' chemistry and ATRP/Ring-opening polymerization techniques0 aNew approach for the synthesis of miktoarm star polymers through cJAN  a146-1560 v573 a

A new approach was developed for synthesis of certain A(3)B(3)-type of double hydrophilic or amphiphilic miktoarm star polymers using a combination of ``grafting onto'' and ``grafting from'' methods. To achieve the synthesis of desired miktoarm star polymers, acetyl protected poly(ethylene glycol) (PEG) thiols (M-n = 550 and 2000 g mol(-1)) were utilized to generate A(3)-type of homoarm star polymers through an in situ protective group removal and a subsequent thiol-epoxy ``click'' reaction with a tris-epoxide core viz. 1,1,1-tris(4-hydroxyphenyl)ethane triglycidyl ether. The secondary hydroxyl groups generated adjacent to the core upon the thiol-epoxy reaction were esterified with alpha-bromoisobutyryl bromide to install atom transfer radical polymerization (ATRP) initiating sites. ATRP of N-isopropylacrylamide (NIPAM) using the three-arm star PEG polymer fitted with ATRP initiating sites adjacent to the core afforded A(3)B(3)-type of double hydrophilic (PEG)(3)[poly(N-isopropylacrylamide)] (PNIPAM)(3) miktoarm star polymers. Furthermore, the generated hydroxyl groups were directly used as initiator for ring-opening polymerization of epsilon-caprolactone to prepare A(3)B(3)-type of amphiphilic (PEG)(3)[poly(epsilon-caprolactone)](3) miktoarm star polymers. The double hydrophilic (PEG)(3)(PNIPAM)(3) miktoarm star polymers showed lower critical solution temperature around 34 degrees C. The preliminary transmission electron microscopy analysis indicated formation of self-assembly of (PEG)(3)(PNIPAM)(3) miktoarm star polymer in aqueous solution. (c) 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 146-156

10aAtom transfer radical polymerization (ATRP)10amiktoarm star polymers10aring-opening polymerization (ROP)10athermoresponsive10athiol-epoxy1 aGadwal, Ikhlas1 aWadgaonkar, Prakash, P.1 aIchake, Amol, B.1 aMane, Shivshankar, R. uhttps://library.ncl.res.in/content/new-approach-synthesis-miktoarm-star-polymers-through-combination-thiol-epoxy-click01816nas a2200205 4500008004100000245015100041210006900192260000800261300001600269490000700285520101900292100002501311700002201336700002501358700002801383700002101411700002601432700002201458856013001480 2019 eng d00aNovel synthetic approach for designing metal-free, redox-active quinoxaline-benzimidazole-based organic polymers with high energy storage capacity0 aNovel synthetic approach for designing metalfree redoxactive qui cOCT a14806-148170 v443 a

New organic framework materials, namely, polyphenylquinoxaline (QOP) and polyphenylquinoxaline-benzimidazole (QOP-BOP) were designed using a high-temperature (>100 degrees C) polymerization reaction with different monomers, i.e., 2,5-bis-[(4-benzoylcarbonyl)phenyl]-3-4 diphenyl thiophene (BbcPDT), aromatic tetraamines and biphenyl dicarboxylic acid. The QOP-BOP copolymer exhibited specific capacitance (SC) of 305 F g(-1) at the current density of 2 A g(-1) and 88% retention of its initial specific capacitance after 1000 cycles, which resulted in good cyclic stability. This work establishes the first use of thiophene integrated with quinoxaline-benzimidazole units for energy storage applications and provides strategies for further developments in the performance of such conjugated materials. Cyclic voltammetry, charge-discharge and electrochemical impedance techniques were used to evaluate the electrochemical parameters, which demonstrated their potential in future energy storage devices.

1 aSalunkhe, Pravin, S.1 aPatil, Yuvraj, S.1 aDhole, Indrajeet, A.1 aKalshetti, Basavraj, S.1 aPatil, Vikas, B.1 aMane, Shivshankar, R.1 aGhanwat, Anil, A. uhttps://library.ncl.res.in/content/novel-synthetic-approach-designing-metal-free-redox-active-quinoxaline-benzimidazole-based02667nas a2200181 4500008004100000022001400041245016800055210006900223260000900292300001400301490000700315520193500322100002502257700002302282700002602305700002802331856012602359 2019 eng d a1759-995400aPartially bio-based aromatic poly(ether sulfone)s bearing pendant furyl groups: synthesis, characterization and thermo-reversible cross-linking with a bismaleimide0 aPartially biobased aromatic polyether sulfones bearing pendant f cMAR  a1089-10980 v103 a

A fully bio-based bisphenol bearing pendant furyl group, viz., 4,4'-(furan-2-ylmethylene) bis(2-methoxyphenol) (BPF) was synthesized by base-catalyzed condensation of furfural with guaiacol. New partially bio-based (co) poly(ether sulfone) s bearing pendant furyl groups were synthesized via aromatic nucleophilic substitution polycondensation of BPF and various mixtures of BPF and bisphenol-A with bis(4-fluorophenyl) sulfone in N, N-dimethylacetamide as a solvent. (Co) poly(ether sulfone) s showed inherent viscosities in the range 0.92-1.47 dL g(-1) and number average molecular weights ((M-n) over bar), obtained from GPC, were in the range 91 300-131 000 g mol(-1). (Co) poly(ether sulfone) s could be cast into tough, transparent and flexible films from chloroform solutions. (Co)poly(ether sulfone)s showed 10% weight loss in the temperature range 431-481 degrees C and DSC showed T-g in the range 179-190 degrees C. Tensile strength, Young's modulus and elongation at break, obtained from tensile testing of (co) poly(ether sulfone) s containing pendant furyl groups, were in the range 76.7-83.8 MPa, 1.02-1.18 GPa and 21.4-89.7%, respectively. Most interestingly, pendant furyl groups in (co) poly(ether sulfone) s provide reactive sites for click modification and cross-linking via Diels-Alder reaction with maleimides and bismaleimides, respectively. Crosslinked (co) poly(ether sulfone) was prepared via Diels-Alder reaction of a representative (co) poly(ether sulfone) containing pendant furyl groups with 1,1'-(methylenedi-1,4-phenylene) bismaleimide (BMI) at 60 degrees C. The formation of cross-linked poly(ether sulfone) was demonstrated by gelation tests, solubility tests and DSC. The cross-linked copoly(ether sulfone) prepared using BMI showed enhanced tensile strength and Young's modulus compared to parent copoly(ether sulfone) and was recycled two times with retention of mechanical properties.

1 aNagane, Samadhan, S.1 aKuhire, Sachin, S.1 aMane, Shivshankar, R.1 aWadgaonkar, Prakash, P. uhttps://library.ncl.res.in/content/partially-bio-based-aromatic-polyether-sulfones-bearing-pendant-furyl-groups-synthesis01482nas a2200145 4500008004100000022001400041245007100055210006900126260000900195300001400204490000700218520098300225100002601208856010201234 2020 eng d a1144-054600aTrending methods employed for polymerization induced self-assembly0 aTrending methods employed for polymerization induced selfassembl cMAY  a6690-66980 v443 a

Mother Nature produces a perfectly defined architecture that inspires researchers to make polymeric macromolecules for an array of functions. Preparation of a pre-defined polymer architecture is a key challenge to a researcher. The present article describes the recent development in Polymerization Induced Self-Assembly (PISA) to synthesize polymeric nanoparticles with pre-defined morphology and precise control over size and shape. This methodology has become a potential strategy for the synthesis of various block copolymer nano-objects. The PISA strategy produces core-shell polymeric nanoparticles with a wide scope of morphologies including spheres, worms, rods, and vesicles. A few parameters including the degree of polymerization, core-forming monomers, macro-CTA and solid content of the final product are precisely employed for the PISA procedure to accomplish the ideal size and shape. PISA opens a new avenue for the production of polymeric nano-objects.

1 aMane, Shivshankar, R. uhttps://library.ncl.res.in/content/trending-methods-employed-polymerization-induced-self-assembly02116nas a2200193 4500008004100000022001400041245010800055210006900163260000900232300001400241490000700255520143100262100002301693700001901716700002001735700002601755700002101781856012001802 2021 eng d a1759-995400aFacile access to functional polyacrylates with dual stimuli response and tunable surface hydrophobicity0 aFacile access to functional polyacrylates with dual stimuli resp cMAY  a3042-30510 v123 a

Magnetically separable and reusable Ni-Co alloy nanoparticles were employed to achieve ambient temperature reversible deactivation radical polymerization (RDRP) of methyl acrylate (MA), for the first time, yielding well-defined PMA (at least up to 124 500 g mol(-1)) with a low dispersity (D <= 1.20). The controlled polymerization character of RDRP of MA was confirmed from the linear semilogarithmic plot exhibiting pseudo first order kinetics, a linear increase of the molecular weight of the polymer with monomer conversion maintaining low D and the synthesis of PMAs of varying molecular weights from 2200 to 124 500 g mol(-1) with low D. In addition, linear PMA-Br was used as a macroinitiator for the synthesis of several well-defined PMA-b-poly(M) block copolymers (where ``M'' stands for (2-dimethylamino)ethyl methacrylate (DMAEMA), tert-butyl methylacrylate (TBMA) and 2,2,3,3,4,4,5,5-octafluoropentyl acrylate (OFPA)), with acceptable Ds (<= 1.24), demonstrating the high chain-end fidelity of the macroinitiator. The synthesized PMA-b-PDMAEMA demonstrated dual pH- and thermo-responsive properties. Upon hydrolysis, the synthesized PMA-b-PTBMA leads to the formation of unprecedented carboxylic acid-functionalized PMA derivatives. PMA-b-POFPA copolymers with varying OFPA mol% in the copolymer led to polymers with tunable surface hydrophobicity, as revealed by the water contact angle measurements.

1 aMohammad, Sk, Arif1 aDolui, Subrata1 aKumar, Devendra1 aMane, Shivshankar, R.1 aBanerjee, Sanjib uhttps://library.ncl.res.in/content/facile-access-functional-polyacrylates-dual-stimuli-response-and-tunable-surface01896nas a2200193 4500008004100000022001400041245008300055210006900138260000800207300001400215490000700229520124400236100002301480700001901503700002001522700002601542700002101568856011301589 2021 eng d a1525-779700aL-Histidine-derived smart antifouling biohybrid with multistimuli responsivity0 aLHistidinederived smart antifouling biohybrid with multistimuli  cSEP a3941-39490 v223 aA novel dual pH/thermoresponsive amphiphilic poly(histidine methacrylamide)-block-hydroxyl-terminated polybutadiene-block-poly(histidine methacrylamide) (PHisMAM-b-PB-b-PHisMAM) triblock copolymer biohybrid, composed of hydrophobic PB and ampholytic PHisMAM segments, is developed via direct switching from living anionic polymerization to recyclable nanoparticle catalyst-mediated reversible-deactivation radical polymerization (RDRP). The transformation involved in situ postpolymerization modification of living polybutadiene-based carbanionic species, end-capped with ethylene oxide, into dihydroxyl-terminated polybutadiene and a subsequent reaction with 2-bromo-2-methylpropionyl bromide resulting in a telechelic ATRP macroinitiator (Br-PB-Br). Br-PB-Br was used to mediate RDRP of an L-histidine-derived monomer, HisMAM, yielding a series of PHisMAM-b-PB-b-PHisMAM triblock copolymers. The copolymer's stimuli response was assessed against pH and temperature changes. The copolymer is capable of switching among its zwitterionic, anionic, and cationic forms and exhibited unique antifouling properties in its zwitterionic form. These novel triblock copolymers are expected to be show promising potential in biomedical applications.1 aMohammad, Sk, Arif1 aDolui, Subrata1 aKumar, Devendra1 aMane, Shivshankar, R.1 aBanerjee, Sanjib uhttps://library.ncl.res.in/content/l-histidine-derived-smart-antifouling-biohybrid-multistimuli-responsivity02264nas a2200193 4500008004100000022001400041245012300055210006900178260000800247300001400255490000700269520156500276100002001841700002301861700001701884700002601901700002101927856012201948 2022 eng d a1759-995400aAmino acid-derived ABCBA-type antifouling biohybrid with multi-stimuli responsivity and contaminant removal capability0 aAmino acidderived ABCBAtype antifouling biohybrid with multistim cAPR a1960-19690 v133 a

Multi-stimuli (pH/thermo/redox)-responsive amphiphilic poly(cysteine methacrylamide)-block-poly(2-(dimethylamino)ethyl methacrylate)-block-polybutadiene-block-poly(2-(dimethylamino)ethyl methacrylate)-block-poly(cysteine methacrylamide) (PCysMAM-b-PDMAEMA-b-PB-b-PDMAEMA-b-PCysMAM) pentablock copolymer biohybrids, based on hydrophobic PB, ampholytic redox responsive PCysMAM and dual (pH and temperature) stimuli responsive PDMAEMA segments, are synthesized via a four-step synthesis protocol. The synthesis protocol involves: (1) in situ post polymerization modification of living polybutadiene-based carbanionic species to prepare hydroxyl terminated polybutadiene (HTPB); (2) introduction of an initiating functionality (capable of acting as an ATRP initiator) to HTPB, yielding a telechelic ATRP macroinitiator (Br-PB-Br); (3) recyclable alloy-mediated successive RDRP of DMAEMA and CysMAM, yielding a series of PCysMAM-b-PDMAEMA-b-PB-b-PDMAEMA-b-PCysMAM (A-B-C-B-A) pentablock copolymers with various chain lengths; and (4) conversion of the PDMAEMA block to poly(quaternary ammonium) (PQA) via quaternization. The stimuli responsiveness of the copolymer is investigated against changes in pH, temperature and redox. The pentablock copolymer self-assembles into spherical nanospheres, can switch between its monocationic, zwitterionic and monoanionic charged states, exhibits antifouling behaviour and is capable of removing ionic contaminants from water. These pentablock copolymers may emerge as a promising material for emerging applications.

1 aKumar, Devendra1 aMohammad, Sk, Arif1 aKumar, Anand1 aMane, Shivshankar, R.1 aBanerjee, Sanjib uhttps://library.ncl.res.in/content/amino-acid-derived-abcba-type-antifouling-biohybrid-multi-stimuli-responsivity-and