Selective reactivity of electron-rich aryl iodides in the Heck arylation of disubstituted alkenes catalyzed by palladium–arylurea complexes
摘要:
A catalyst consisting of 1 mol % of the 1:2 complex of Pd(OAc)(2) with N-(4-carbethoxyphenyl)urea promotes the Heck arylation of 2- or 3-substituted, conjugated esters, nitriles, aldehydes, and ketones (an uncharacteristically broad range of substrates), but only with electron-rich aryl iodides (an uncharacteristically narrow range of halides). (C) 2013 Elsevier Ltd. All rights reserved.
This study describes the first para-selective palladium-catalyzed alkenylation of tertiary amines. This regioselective C–H activation was conducted without any chelation moieties. A series of olefins were reacted under mild reaction conditions at 60 °C, and the corresponding products were obtained in good yields with high selectivity.
Structurally Simple Dipolar Organic Dyes Featuring 1,3-Cyclohexadiene Conjugated Unit for Dye-Sensitized Solar Cells
作者:Kuan-Fu Chen、Ying-Chan Hsu、Qiongyou Wu、Ming-Chang P. Yeh、Shih-Sheng Sun
DOI:10.1021/ol802630x
日期:2009.1.15
A series of structurally simple dipolar light-harvesting organic dyes featuring 1,3-cyclohexadiene in the aromatic pi framework for dye-sensitized solar cells has been synthesized and characterized. The highest conversion efficiency of the DSSCs based on these dyes can reach up to 4.4%.