作者:Joel M. Smith、Tian Qin、Rohan R. Merchant、Jacob T. Edwards、Lara R. Malins、Zhiqing Liu、Guanda Che、Zichao Shen、Scott A. Shaw、Martin D. Eastgate、Phil S. Baran
DOI:10.1002/anie.201705107
日期:2017.9.18
The development of a new decarboxylative cross‐coupling method that affords terminal and substituted alkynes from various carboxylic acids is described using both nickel‐ and iron‐based catalysts. The use of N‐hydroxytetrachlorophthalimide (TCNHPI) esters is crucial to the success of the transformation, and the reaction is amenable to in situ carboxylic acid activation. Additionally, an inexpensive
The Negishicoupling of aryl bromides or acyl chlorides with organozinc chlorides catalyzed by a palladiumbipyridylcomplex anchored on nanosized mobile crystalline material 41 (MCM‐41) were investigated. The reactions proceeded smoothly with a very low catalyst loading in THF at 70 °C for electron‐deficient aryl bromides, which gave good to high yields of the Negishicoupling products. However, reactions
Allenylpalladium(II) species: possible intermediates in the tetrakis(triphenylphosphine)palladium(0)-catalysed formation of allenes from prop-2-ynylic substrates
作者:Cornelis J. Elsevier、Henk Kleijn、Klaas Ruitenberg、Peter Vermeer
DOI:10.1039/c39830001529
日期:——
The formation of a 3-methylbuta-1,2-diphenylpalladium(II) complex (2) from the prop-2-ynylic chloride (1a) or the prop-2-ynylic acetate (1b) and tetrakis(triphenylphosphine)palladium(0), as well as its conversion into the allenes(4), is described.
Oxovanadium(V)-Induced Cross-Coupling Reaction between Two Ligands of Organozinc Compounds
作者:Toshikazu Hirao、Takashi Takada、Akiya Ogawa
DOI:10.1021/jo9919106
日期:2000.3.1
Oxovanadium(V) compounds such as VO(OEt)Cl(2) serve as useful oxidants for organozinc compounds, providing the corresponding cross-coupling products derived from two ligands of organozinc compounds. In particular, triorganozincates undergo selective cross-coupling smoothly by the action of oxovanadium(V).
Synthesis of polyphenylene derivatives by thermolysis of enediynes and dialkynylaromatic monomers
作者:Jens A John、James M Tour
DOI:10.1016/s0040-4020(97)00977-0
日期:1997.11
Described are the syntheses of substituted enediynes and dialkynylaromatics using Pd- or cross coupling procedures. The products were then thermalized to afford the corresponding poly(p-phenylene)s, poly(1,4-naphthalene)s, poly(benzo[c]thiophene)s, and poly(dibenzothiophene)s. Fifteen examples are provided that show the scope of the polymerization process based upon substituent patterns and cyclization