Palladium- and platinum-catalyzed coupling reactions of allyloxy aromatics with hydridosilanes and hydridosiloxanes: Novel liquid crystalline/organosilane materials
dc.contributor.author | Sellinger, Alan | en_US |
dc.contributor.author | Laine, Richard M. | en_US |
dc.contributor.author | Chu, Vano P. | en_US |
dc.contributor.author | Viney, Christopher | en_US |
dc.date.accessioned | 2006-04-28T18:19:25Z | |
dc.date.available | 2006-04-28T18:19:25Z | |
dc.date.issued | 1994-12 | en_US |
dc.identifier.citation | Sellinger, Alan; Laine, Richard M.; Chu, Vano; Viney, Christopher (1994)."Palladium- and platinum-catalyzed coupling reactions of allyloxy aromatics with hydridosilanes and hydridosiloxanes: Novel liquid crystalline/organosilane materials." Journal of Polymer Science Part A: Polymer Chemistry 32(16): 3069-3089. <http://hdl.handle.net/2027.42/38845> | en_US |
dc.identifier.issn | 0887-624X | en_US |
dc.identifier.issn | 1099-0518 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/38845 | |
dc.description.abstract | Pt-and Pd-catalyzed reactions of a set of allyloxyaromatic mono-and diesters with selected silanes were examined to develop simple, mild methods of forming liquid crystal (LC)/ siloxane and LC/silsesquioxane polymers. Pt complexes catalyze hydrosilylation to give primarily (≤ 80% selectivity at 100% conversion) terminal silylation of the allyloxys. The catalyst, platinum-1,3-divinyltetramethyldisiloxane [Pt (dvs), gives the cleanest reactions, fewest side products, under the mildest conditions. Model studies of Pt(dvs) catalyzed hydrosilylation of 4-allyloxy methylbenzoate gave relative reactivities (HSiO 1.5 ) 8 > Et 3 SiH > HMe 2 Si[bond]O[bond]SiMe 2 H > Ph 2 SiH2. The cubic silsesquioxane, (HSiO 1.5 ) 8 , is so reactive hydrosilylation is over in 1–3 h at 0°C. All other reactions required > 40°C and longer reaction times. Initial efforts to form high polymers by Pt-catalyzed reactions of bis-allyloxy aromatics with Ph 2 SiH 2 provide polymers with bimodal MW distributions (polystyrene), M w s ≈ 30 kDa, and PDIs ≈ 5. Pd catalysis gives quite different products resulting from loss of propene with coincident formation of Si[bond]O bonds, “oxysilylation.” The same products appear (10–15%) in some Pt catalyzed reactions. Palladium dibenzylideneacetone/ Ph 3 P[Pd(dba) 2 /Ph 3 P], gives the cleanest oxysilylation reactions. Relative oxysilylation activities are: Ph 2 SiH 2 > HMe 2 SiOSiMe 2 H > Et 3 SiH. Polymerization with Pd catalysts provides polymers with M w s ≈ 11 kDa, and PDIs ≈ 2. Reaction of 1 equiv. of (HSiO 1.5 ) 8 with 4 equiv. of 4-(4-allyloxy-benzoyloxy) biphenyl gives relatively pure tetrasubstituted LC/silsesquioxane [ M n ≈ 1860 Da, PDI ≈ 1.09 (styrene equiv.) vs. 1746 Da caled.] A detailed analysis of the products formed, the catalytic reactivity patterns of the his (allyloxy) aromatic diesters and their LC transitions is presented. © 1994 John Wiley & Sons, Inc. | en_US |
dc.format.extent | 2648570 bytes | |
dc.format.extent | 3118 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | John Wiley & Sons, Inc. | en_US |
dc.subject.other | Chemistry | en_US |
dc.subject.other | Polymer and Materials Science | en_US |
dc.title | Palladium- and platinum-catalyzed coupling reactions of allyloxy aromatics with hydridosilanes and hydridosiloxanes: Novel liquid crystalline/organosilane materials | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Chemical Engineering | en_US |
dc.subject.hlbtoplevel | Engineering | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Departments of Materials Science and Engineering, Chemistry, and the Macromolecular Science and Engineering Center, University of Michigan, Ann Arbor, Michigan 48109-2136 | en_US |
dc.contributor.affiliationum | Departments of Materials Science and Engineering, Chemistry, and the Macromolecular Science and Engineering Center, University of Michigan, Ann Arbor, Michigan 48109-2136 ; Departments of Materials Science and Engineering, Chemistry, and the Macromolecular Science and Engineering Center, University of Michigan, Ann Arbor, Michigan 48109-2136 | en_US |
dc.contributor.affiliationother | Molecular Bioengineering Program, Center for Bioengineering, WD-12, University of Washington, Seattle, Washington 98195 | en_US |
dc.contributor.affiliationother | Molecular Bioengineering Program, Center for Bioengineering, WD-12, University of Washington, Seattle, Washington 98195 | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/38845/1/080321608_ftp.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1002/pola.1994.080321608 | en_US |
dc.identifier.source | Journal of Polymer Science Part A: Polymer Chemistry | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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