Catalytic Efficiency of a New Tridentate Ferrocenyl Phosphine Auxiliary: Sonogashira Cross-Coupling Reactions of Alkynes with Aryl Bromides and Chlorides at Low Catalyst Loadings of 10<sup>-</sup><sup>1</sup> to 10<sup>-</sup><sup>4</sup> Mol %
作者:Jean-Cyrille Hierso、Aziz Fihri、Régine Amardeil、Philippe Meunier、Henri Doucet、Maurice Santelli、Vladimir V. Ivanov
DOI:10.1021/ol048870z
日期:2004.9.1
see text] The catalytic activity in Sonogashira cross-coupling reactions of alkynes with a variety of aryl halides (including chlorides) using a multidentate ferrocenyl phosphine is presented. The novel mixed ferrocenyl aryl/alkyl triphosphine is thermally stable and insensitive to air or moisture, and its robustness allows arylalkynylation at 10(-1) to 10(-4) mol % catalyst loadings with TONs up to
C(sp2)-C(sp) and C(sp)-C(sp) Coupling Reactions Catalyzed by Oxime-Derived Palladacycles
作者:Diego A. Alonso、Carmen Nájera、Ma Carmen Pacheco
DOI:10.1002/adsc.200303067
日期:2003.9
4′-dichlorobenzophenone, is an efficient pre-catalyst for the copper- and amine-free Sonogashira coupling between terminal acetylenes and aryl iodides and aryl and vinyl bromides achieving turnover numbers (TON) of up to 72000. Catalyst 8a has also been shown as a effective promoter for the sila-Sonogashira coupling between 1-(trimethylsilyl)alkynes and aryl iodides and bromides in the presence of CuI or
This manuscript describes the synthesis and optical properties of a series of anthracenyl-o-carborane dyads exhibiting highly-efficient luminescence with various types of substituent groups at the adjacent carbon atom of o-carborane. The restricted rotational motion of the anthracene moiety and the ideal orientation for intramolecular charge transfer from the anthracene moiety to the carborane cluster
Direct Synthesis of Alkynylstannanes: ZnBr<sub>2</sub>Catalyst for the Reaction of Tributyltin Methoxide and Terminal Alkynes
作者:Kensuke Kiyokawa、Nodoka Tachikake、Makoto Yasuda、Akio Baba
DOI:10.1002/anie.201104208
日期:2011.10.24
Metal hopping: Various alkynylstannanes were synthesized by the directreaction of Bu3SnOMe with terminalalkynes at room temperature in the presence of a ZnBr2 catalyst. Rather than acting as a Lewis acid, ZnBr2 was transmetalated with Bu3SnOMe to give Zn(OMe)2, which is key to the catalytic reaction.