Acid-catalyzed transformation of rubrene to indenonaphthacene and its paired interacting orbital (PIO) analysis
摘要:
Treatment of rubrene (5,6,11,12-tetraphenylnaphthacene) with trifluoroacetic acid in dichloromethane gives 4b,9,10-triphenyl-4b,9-dihydroindeno[1,2,3-fg]naphthacene (1) as the sole isolable product. Paired interacting orbital (PIO) analysis indicates that the reaction is initiated by preferential attack of H+ at C(11) position of rubrene. (C) 2003 Elsevier Science Ltd. All rights reserved.
we describe the synthesis of new substituted tetraaryltetracenes, obtained by the dimerization of triarylchloroallenes, prepared from propargyl alcohols. The propargyl alcohols were prepared by two different synthetic strategies and then the alcohols were treated to obtain the corresponding acenes. In addition to the expected tetracene derivatives, we observed the formation of bis(alkylidene)cyclobutenes
Preparative Oxidation of Organic Compounds in Microemulsions with Singlet Oxygen Generated Chemically by the Sodium Molybdate/Hydrogen Peroxide System<sup>1</sup>
作者:Jean-Marie Aubry、Sabine Bouttemy
DOI:10.1021/ja9644079
日期:1997.6.1
designed to oxidize hydrophobic organic substrates with singletoxygen (1O2, 1Δg) generated from the disproportionation of hydrogenperoxidecatalyzed by molybdateions. The microemulsion was prepared by mixing methylene chloride, sodium dodecylsulfate, n-butanol, and aqueous molybdate. Flash photolysis studies have shown that in such media singletoxygen exhibits a similar kinetic behavior that under homogeneous
specific trapping have shown that CaO(2).2H(2)O(2) can be stored for several days at -80 degrees C and that the yield of (1)O(2) is equal to 25%. Oxidation of typical organic substrates in methanol or THF through [4 + 2] or [2 + 2] cycloaddition and ene reaction have been carried out on a preparative scale with total conversion and selectivity.
作者:Abhimanyu S. Paraskar、A. Ravikumar Reddy、Asit Patra、Yair H. Wijsboom、Ori Gidron、Linda J. W. Shimon、Gregory Leitus、Michael Bendikov
DOI:10.1002/chem.200800802
日期:——
crystal, rubrene shows very low mobility in vacuum-sublimed or solution-processed organic thin-film transistors. We synthesized several rubrene analogues with electron-withdrawing and electron-donating substituents and found that most of the substituted rubrenes are not planar in the solid state. Moreover, we conclude (based on experimental and calculated data) that even parent rubrene is not planar in solution
Going in for infra red: The development of phthalocyanine catalysts directly activated by NIR light to transform small organic molecules is described. The choice of solvent is important to promote cross-dehydrogenative coupling under irradiation with 810 nm NIR light. A combined experimental and computational mechanistic analysis revealed that this NIR reaction involves a singlet-oxygen-mediated mechanism