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
Mixed-Metal Cluster Chemistry. 21. Synthesis and Crystallographic and Electrochemical Studies of Alkyne-Coordinated Group 6−Iridium Clusters Linked by Phenylenevinylene Groups
作者:Nigel T. Lucas、Eleni G. A. Notaras、Marie P. Cifuentes、Mark G. Humphrey
DOI:10.1021/om020203r
日期:2003.1.1
5-C6H3[(E)-CHCHC6H4-4‘-C2(CH2)5Me]3} (25), and W2Ir2(μ4-η2-R1C2R2)(μ-CO)4(CO)4(η5-C5H4Me)2 (R1 = n-hexyl, R2 = 4-C6H4C⋮C(CH2)5Me (21); R1 = H, R2 = (CH2)2C⋮CH (26)). Compounds 18−20 and 22−25 contain two or threecluster units linked by unsaturated bridges, while 27 contains two cluster units linked by a saturated bridge. Compound 22 was prepared in lower yield by coupling 16 and 17 under Emmons−Horner conditions
所述pseudooctahedral monocluster物M 2的Ir 2(μ 4 -η 2 -R 1 c ^ 2 - [R 2)(μ-CO)4(CO)4(η 5 -C 5 H ^ 4 Me)的2(M =钼,R 2 = Ph,R 1 = H(12),Ph(13),Me(14); M = W,R 2 = Ph,R 1 = Me(15); M = Mo,R 1 = n-己基,R 2 =碳6 H由四面体簇化合物M 2 Ir 2(CO)10(η )之间的反应制备了4 -4-CHO(16),C 6 H 4 -4-CH 2 P(O)(OEt)2(17))。5 -C 5 H 4 Me)2和炔烃R 1 C 2 R 2。四面体簇前体和二-或三炔之间的类似反应已经得到相关化合物[M 2的Ir 2(μ-CO)4(CO)4(η 5-C 5 ħ 4 R)2 ] 2(μ 8 -η 4 -R 1 c ^ 2 BC 2
Platinum complex-catalysed polycondensation of tetrakis(dimethylsilyl)benzene with diynes. Synthesis of thermally stable and conducting polymers
Dehydrogenative double silylation polymerisation of diynes with 1,2,4,5- tetrakis(dimethylsilyl) benzene in the presence of a catalytic amount of (ethylene)bis(triphenylphosphine)platinum gives new silicon-based polymers, which show high thermal stability and conductivity upon doping.
photochemical behaviour is studied using UV-visible absorptionspectra, fluorescence emission spectra, and TD-DFT calculations. The cross-trimer prepared from 2,5-dialkynylthiophene with 2 equiv. of 2-butadienylpyridine shows a longer wavelength shift in the absorption maximum than the cross-trimer prepared from dialkynylbenzene with 1-phenylbutadiene. The solvent effect and the TD-DFT calculations suggest that
A Remarkably Efficient Synthesis of Pure <i>cis</i>-Stilbenoid Hydrocarbons Using <i>trans</i>-Dibromoalkenes via Palladium Catalysis
作者:Rajendra Rathore、Mihaela I. Deselnicu、Carrie L. Burns
DOI:10.1021/ja027421w
日期:2002.12.1
A remarkably versatile synthesis of cis-stilbenoid hydrocarbons containing highly functionalized phenyl groups is developed via an efficient palladium-catalyzed coupling of aryl Grignard reagents with trans-1,2-dibromoalkenes (generally obtained via bromination of the corresponding dialkylacetylenes) in tetrahydrofuran.