Direct synthesis of 1,1-diarylalkenes from alkenyl phosphates via nickel(0)-catalysed Suzuki–Miyaura coupling
作者:Anders L. Hansen、Jean-Philippe Ebran、Thomas M. Gøgsig、Troels Skrydstrup
DOI:10.1039/b609064h
日期:——
A combination of Ni(COD)(2) and PCy(3) promotes effectively the Suzuki-Miyaura cross coupling of 1-arylalkenyl phosphates with aryl boronic acids with yields attaining 99%.
Reactions of 1,1-diarylethylenes with selenium compounds
作者:D. Elmaleh、S. Patai、Z. Rappoport
DOI:10.1039/j39710002637
日期:——
The synthesis of substituted benzoselenopheno[2,3-b]benzoselenophensfrom1,1-diarylethylenes was achieved in much higher yields with diselenium dichloride than with seleninyl chloride. 1,1-Bis-(2,4-dimethylphenyl)-ethylene with either selenium tetrachloride or diselenium dichloride yielded the corresponding 2,2-diarylvinyl selenide; reactions of other diarylethylenes with selenium tetrachloride or
用二氯化二硒比用硒基氯以高得多的产率由1,1-二芳基乙烯合成取代的苯并硒吩[2,3- b ]苯并硒酚。1,1-双-(2,4-二甲基苯基)-乙烯与四氯化硒或二氯化二硒产生相应的2,2-二芳基乙烯基硒化物;其他二芳基乙烯与四氯化硒或四溴化硒的反应生成无硒产物。扩大与亚硒酰氯的反应以产生二-1-苯并硒基苯并[2,3- b:2',3'- b ']苯并二硒酚。
One-pot synthesis of oligomeric aryl-substituted PPV analogs with extended π-conjugation
作者:Ben-Ami Feit、Ludmila Buzhansky
DOI:10.1039/a905710b
日期:——
A conceptually novel approach for a stepwise one-pot synthesis of oligomeric poly(phenylvinylene) (PPV, â[C6H4âCHCH]â) analogs with extended Ï-conjugation of the type Hâ[CHC(Ar)âC6H4âC(Ar)CH]nâH (n = 2, 4), from the corresponding dienic monomers (n = 1), has been studied. The oligomerizations were performed in high yields by repeating the sequential preparation of the mercuric trifluoroacetate derivative Hâ[CHC(Ar)âC6H4âC(Ar)CH]nâHgCO2CF3 (n = 1, 2) and its coupling in the presence of PdCl2. The feasibility of this approach was demonstrated by a one-pot preparation of several tetramers, directly from the corresponding monomers.
我们研究了一种概念新颖的方法,即从相应的二元单体(n =  1)一步法合成具有 Hâ[CHC(Ar)âC6H4âC(Ar)CH]nâH (n =  2、4)型扩展Ï-共轭的低聚聚聚苯乙烯(PPV,â[C6H4âCHCH]â)类似物。通过重复三氟乙酸汞衍生物 Hâ[CHC(Ar)âC6H4âC(Ar)CH]nâHgCO2CF3 (n = 1, 2)的连续制备及其在 PdCl2 存在下的偶联,以高产率实现了低聚物化。这种方法的可行性体现在直接从相应的单体一锅制备出了几种四聚体。
Electron Delocalization in Cross-Conjugated p-Phenylenevinylidene Oligomers
作者:Mark Klokkenburg、Martin Lutz、Anthony L. Spek、John H. van der Maas、Cornelis A. van Walree
DOI:10.1002/chem.200204671
日期:2003.8.4
between the repeating units is, however, not very strong, which has the consequence that spatial extension of the molecularorbitals does not lead to a red shift of the highest occupied molecular orbital-lowest unoccupied molecularorbital (HOMO-LUMO) electronic transition. This is related to the feature that the modest narrowing of the HOMO-LUMO gap with the chain length is accompanied by a relatively
Highly desirable multifunctional lithium containing initiators are prepared by reacting a compound such as an organo lithium with an organic compound containing at least two 1,1-diphenylethylene groups. Such initiators can be prepared in the absence of polar solvents and are very desirable for the polymerization of dienes such as butadiene to a desirable 1,4 configuration. Several di-lithium compounds have been employed to initiate polymerization of various unsaturated organic monomers.