CMA 1 |
| Over the past several decades there have been profound advances in the field of lighting technologies. Leading this revolution is the production of electroluminescent devices such as Light Emitting Diodes (LED). Poly(phenylene vinylene)s (PPVs) are currently popular as substrates for these devices due to their extended π-conjugation and the unique methods of polymerization available for their preparation. One method, the Gilch polymerization, provides for high molecular weight polymers with low polydispersities. Poly(phenylene vinylene) light emission can be tuned by the introduction of phenyl and alkoxy substituents. Phenyls enhance solubility and alkoxy groups can influence the emission wavelength. The inverse electron demand Diels-Alder reaction of 2,5-bis-(methoxycarbonyl)-3,4-diphenylcyclopentadienone with the vinyl ethers vinyl acetate, vinyloxy trimethylsilane and ethyl vinyl ether yields a series of carbonyl bridged adducts. These adducts can undergo thermal extrusion of carbon monoxide followed by aromatization with bromine to the corresponding alkoxy substituted aromatic diesters. These diesters provide the basis for the construction of versatile phenolic PPV monomers. |
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Many Faces of Chemistry: ACS Scholars’ Contributions to the Chemical Sciences
8:30 AM-11:30 AM, Monday, August 20, 2007 Sheraton Boston -- Liberty A/B, Oral
Committee on Minority Affairs |