NOVEL POLYSTYRENES

Scheme 7.130 Preparation and application of a novel polystyrene-bound anthracene as a dienophile scavenger.

G Brunow, AI Hatakka, I Kilpelainen, TK Lundell. Use of Novel Polystyrene-Bound Lignin Models as Substrates for Lignin Peroxidases from Phlebia Radiata. Proc Int Symp Wood Pulp Chem, Melbourne, Australia, Vol. 1, 165 (1991). 

The preparation of a novel polystyrene-supported dehydrating agent and its application to the synthesis of 1,3,4-oxadiazoles under thermal and microwave conditions has been reported. An alternative procedure using tosyl chloride and P-BEMP has also been presented [33] (Scheme 5.16). 

Aresta M, Dibenedetto A, Nocito F, Angelini A, Gabriele B (2010) Synthesis and characterization of a novel polystyrene-tethered niobium methoxo species. Its application in the CO2-based carboxylation of methanol to afford dimethyl carbonate. AppI Catal A Gen 387 113-118... 

Inoue, K., Tanigaki, T., Yuan, Z., Synthesis of novel polystyrene derivatives with pendant oligo(oxyethylene)cyclo-triphosphazenes and ionic conductivities of their LiC104 complexes. Polymers for Advanced Technologies, 1993, 4, 74—79. 

The insulating value and mechanical properties of rigid plastic foams have led to the development of several novel methods of buUding constmction. Polyurethane foam panels may be used as unit stmctural components (220) and expanded polystyrene is employed as a concrete base in thin-sheU constmction (221). 

A novel cross-linked polystyrene-divinylbenzene copolymer has been produced from suspension polymerization with toluene as a diluent, having an average particle size of 2 to 50 /rm, with an exclusive molecular weight for the polystyrene standard from about 500 to 20,000 in gel-permeation chromatography. A process for preparing the PS-DVB copolymer by suspension polymerization in the presence of at least one free-radical polymerization initiator, such as 2,2 -azo-bis (2,4-dimethylvaleronitrile) with a half-life of about 2 to 60 min at 70°C, has been disclosed (78). 

A novel and versatile method for preparing polymer-supported reactive dienes was recently developed by Smith [26]. PS-DES (polystyrene diethyl-silane) resin 28 treated with trifluoromethanesulfonic acid was converted to a polymer-supported silyl triflate 29 and then functionalized with enolizable a,jS-unsaturated aldehydes and ketones to form silyloxydienes 30 and 31 (Scheme 4.4). These reactive dienes were then trapped with dienophiles and the Diels Alder adducts were electrophilically cleaved with a solution of TFA. 

Asathana S., Majoros I., and Kennedy J.P., TPEs Star-block comprising multiple polystyrene-b-PIB arms radiating from a crossUnked polydivinylbengene core. Rubber Chem. TechnoL, 71, 949, 1998. Shim J.S. and Kennedy J.P., Novel thermoplastic elastomers. II. Properties of star-block copolymers of PST-b-PlB arms emanating from cyclosiloxane cores, J. Polym. Set, Part A, Polym. Chem., 37, 815, 1999. 

Puskas, J.E. et al. Synthesis and characterization of novel dendritic (arborescent) polyisobutylene-polystyrene thermoplastic elastomers, J. Polym. Set A, 43, 1811, 2005. 

Puskas, J.E., Pattern, W.E., Wetmore, P.M., and Krukonis, A. Synthesis and characterization of novel six-arm star polyisobutylene-polystyrene block copolymers. Rubber Chem. TechnoL, 72, 559-568, 1999. Puskas, J.E., Wetmore, P.M., and Krukonis, A. Supercritical fluid fractionation of polyisobutylene-polystyrene block copolymers, Polym. Prepr., 40, 1037-1038, 1999. 

Chattopadhyay, S., Kwon, Y., Naskar, A.K., Bhowmick, A.K., and Puskas, J.E. Novel Dendritic (Arborescent) Pol3dsobutylene-Polystyrene Thermoplastic Elastomers. Paper 27, ACS Rubber Division, 162th Technical Meeting, October 8-11, Pittsburgh, PA, 2002. 

El Fray, M., Puskas, J.E., Tomkins, M., and Altstadt, V. Evaluation of the Eatigue Properties of a Novel Polyisobutylene-Polystyrene Thermoplastic Elastomer in Comparison with other Rubbery Biomaterials. Paper 76, ACS Rubber Division, 166th Technical Meeting, October 5-8, Columbus, OH, 2004. Puskas, J.E. and Chen, Y. Novel Thermoplastic Elastomers for Biomedical Applications. Paper 40, ACS Rubber Division, 163nd Technical Meeting, April 28-30, San Erancisco, CA, 2003. 

Nanometer size Pd colloids in block copolymer micelles of polystyrene polyvinylpyridine as catalysts have been used is a novel way by Klingelhofer for Heck reaction of C-C coupling of aryl halides with olefins. 

Yang, Y.-B., Harrison, K., and Kindsvater, J., Characterization of a novel stationary phase derived from a hydrophilic polystyrene-based resin for protein cation-exchange high-performance liquid chromatography, /. Chromatogr. A, 723, 1, 1996. 

Fig. 9 (a) Molecular structures of novel ESIPT dyes, 2,5,-bis[5-(4-t-butylphenyl)-[l,3,4]oxadia-zol-2-yl]-phenol (SOX), and 2,5-bis[5-(4-t-butylphenyl)-[l,3,4]oxadiazol-2-yl]-benzene-l,4,-diol (DOX). (b) Emission colors in the Commission Internationale de L Eclariage (CEE) chromaticity diagram. The inner oval and the filled circle at coordinate (x,y) of (0.33, 0.33) indicate the white region and the ideal color, respectively. Note that PS and PVK denote polystyrene and poly (N-vinylcarbazole) film (reprint from ref. [91], Copyright 2005 Wiley-VCH)... 

The [RhCl(CO)2]2 dimer immobilized on a cross-linked polystyrene containing pyrrolidine effects the same novel selectivity as the homogeneous analog in hydrogenation of a,/3-unsaturated aldehydes to the unsaturated alcohols, Eq. (30) (162). 

Moreover, during the course of our studies, N- I -(4,4-di-methyl-2,6-dioxocyclohex-1 -ylidene)ethyl]hydroxylamine, Dde-NHOH was also successfully coupled with 2-chlorotrityl chloride polystyrene in excellent efficiency.1 The novel compound Dde-NHOH was prepared, in 51% yield, by reacting 2-acetyldi-medone with hydroxylamine in MeOH THF at 5°C for 3h, followed by recrystallization from ice-cold hexane the major side-product, which increases in quantity over prolonged reaction time, was the predicted cyclized derivative 3,6,6-trimethyl-4-oxo-4,5,6,7-tetrahydro-1,2-benzisoxazole. 

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