01966nas a2200193   4500008004100000022001400041245015200055210006900207260009900276300001400375490000700389520115400396653001801550653003301568653001801601100001301619700001401632856012601646       2005                        eng d  a0032-386100aMorphological consequences of interchange reactions during solid state copolymerization in poly(ethylene terephthalate) and polycarbonate oligomers0 aMorphological consequences of interchange reactions during solid  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcAUG  a7443-74490 v463 a<p>Poly(ethylene terephthalate) (PET) (IV:0.15dL/g) oligomer was obtained by depolymerisation of high molecular weight PET. Polycarbonate (PC) oligomer (IV: 0. 15 dL/g) was synthesized by standard melt polymerization procedure using bisphenol A and diphenyl carbonate in the presence of a basic catalyst. Blends of varying compositions were prepared by melt blending the chemically distinct PET and PC oligomers. The copolymer, poly(ethylene terephthalate-co-bisphenol A carbonate) was synthesized by simultaneous solid state polymerization and ester-carbonate interchange reaction between the oligomers of PET and PC. The reaction was carried out under reduced pressure at temperatures below the melting temperature of the blend samples. DSC and WAXS techniques characterized the structure and morphology of the blends, while (NMR)-N-1 spectroscopy was used to monitor the progress of interchange reactions between the oligomers. The studies have indicated the amorphisation of the PET and PC crystalline phases in solid state with the progress of solid-state polymerization and interchange reaction. (c) 2005 Elsevier Ltd. All rights reserved.</p>10aamorphization10apoly(ethylene terephthalate)10aPolycarbonate1 aGowd, EB1 aRamesh, C  uhttps://library.ncl.res.in/content/morphological-consequences-interchange-reactions-during-solid-state-copolymerization-002748nas a2200241   4500008004100000022001400041245025200055210006900307260010300376300001400479490000700493520173800500653000802238653000802246653002702254653002102281653001702302100001202319700001702331700001402348700001502362856012902377       2005                        eng d  a0376-469900aNitrogen ligands: The transition metal catalyzed reaction of aryl halides with olefins (Mizoroki-Heck), phenylboronic acid (Suzuki coupling) and Buchwald-Hartwig amination, new catalysts and effect of co-catalysts - Aryl halide activation - Part I0 aNitrogen ligands The transition metal catalyzed reaction of aryl  aANUSANDHAN BHAWAN, 2 RAFI MARG, NEW DELHI, 110001, INDIAbCOUNCIL SCIENTIFIC & INDUSTRIAL REScSEP  a1894-19080 v443 a<p>Nitrogen ligands are an excellent alternative for the traditional P-ligands in the Pd catalyzed Mizoroki-Fleck reaction, Suzuki coupling and Buchwald-Hartwig aryl amination. Pd complexes of dimethyl glyoxime, 8-hydroxyquinoline, salen, picolinic acid, and DAB ligands gave high yields of the E-cinnamates and E-stilbenes from aryl iodides. Acetophenone oxime N, N-dimethybenzylamine and ferrocenyl oxime palladacycle are better catalysts with comparable yields, high TON (95, 000) and TOF's (2, 500 h(-1)) to P-ligand catalysts. Aryl bromides and in a few cases, aryl chlorides could also be activated by these complexes by the use of Lewis acid and (C(4)H(9))(4)NI as additives. Cy-DAB ligands gave good yields with electron rich aryl bromides and the use of ionic liquid improve the yield. These N-ligand metal complexes can be readily synthesized and the ligands possess the advantage of easy functional group modifications and convenient synthetic methods compared to P-ligands. The degradation reactions associated with P-ligands are not observed in the N-ligands, with comparable, high thermal, moisture and air stability and insensitivity. Activation of aryl bromides (Mizoroki-Fleck reaction, Suzuki reaction) could be achieved in high yields, TON and TOF (86-94% yield, TON: 36, 000-90, 000, TOF:6, 000-11, 500 h-1) catalyzed by monomeric amine and oxime palladacycles (Cat-8, 11, 13 B) with a N-heterocyclic carbene ligand better than a phosphorous ligand. Molten (C(4)H(9))(4)NBr is an efficient ionic liquid medium for the Mizoroki-Fleck reaction of aryl bromides, giving higher yields. Low to moderate yields of aryl amination are obtained with the carbene pallaclacycle and N, N-dibenzyl piperazine Pd complexes.</p>10aDAB10aDMG10aMizoroki-Heck reaction10anitrogen ligands10aPalladacycle1 aIyer, S1 aKulkarni, GM1 aRamesh, C1 aSattar, AK  uhttps://library.ncl.res.in/content/nitrogen-ligands-transition-metal-catalyzed-reaction-aryl-halides-olefins-mizoroki-heck-0