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Subhabrata Chaudhury Dennis W. Bennett Tasneem A. Siddiquee 《Journal of organometallic chemistry》2004,689(9):1437-1443
Tricarbonyl(1-methoxycarbonyl-5-phenylpentadienyl)iron(1+) hexafluorophosphate (7) was prepared in two steps from tricarbonyl(methyl 6-oxo-2,4-hexadienoate)iron. While addition of carbon and heteroatom nucleophiles to 7 generally occurs at the phenyl-substituted dienyl carbon to afford (2,4-dienoate)iron products, the addition of phthalimide proceeded at C2 to afford a (pentenediyl)iron product (18). Complex 18 was structurally characterized by X-ray diffraction analysis. 相似文献
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The nickel catalyzed reductive coupling of allylic carbonates with chloro-cyclotryptamine analogs to construct sterically congested all C(sp3) quaternary centers has been achieved with emphasis on the substrate scope. And the using of dienyl methyleneyl carbonates coupling with a variety of tertiary alkyl halides furnished the dienylated products improved the reaction's applicability. 相似文献
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Keith P Carruthers 《Journal of organometallic chemistry》2004,689(4):848-859
Protonation of the cycloheptatriene complex [W(CO)3(η6-C7H8)] with H[BF4] · Et2O in CH2Cl2 affords the cycloheptadienyl system [W(CO)3(η5-C7H9)][BF4] (1). Complex 1 reacts with NaI to yield [WI(CO)3(η5-C7H9)], which is a precursor to [W(CO)2(NCMe)3(η3-C7H9)][BF4], albeit in very low yield. The dicarbonyl derivatives [W(CO)2L2(η5-C7H9)]+ (L2=2PPh3, 4, or dppm, 5) were obtained, respectively, by H[BF4] · Et2O protonation of [W(CO)2(PPh3)(η6-C7H8)] in the presence of PPh3 and reaction of 1 with dppm. The X-ray crystal structure of 4 (as a 1/2 CH2Cl2 solvate) reveals that the two PPh3 ligands are mutually trans and are located beneath the central dienyl carbon and the centre of the edge bridge. The first examples of cyclooctadienyl tungsten complexes [WBr(CO)2(NCMe)2(1-3-η:5,6-C8H11)] (6) and [WBr(CO)2(NCMe)2(1-3-η:4,5-C8H11)] (7) were synthesised by reaction of [W(CO)3(NCR)3] (R=Me or Prn) with 3-Br-1,5-cod/6-Br-1,4-cod or 5-Br-1,3-cod/3-Br-1,4-cod (cod=cyclooctadiene), respectively. Complexes 6 and 7 are precursors to the pentahapto-bonded cyclooctadienyl tungsten species [W(CO)2(dppm)(1-3:5,6-η-C8H11)][BF4] and [W(CO)2(dppe)(1-5-η-C8H11)][BF4] · CH2Cl2. 相似文献
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3‐Phenylthio‐3‐sulfolene ( 1 ) was readily converted to a C‐5 substituted product 2 , which upon thermolysis and complexation with Fe2(CO)9 gave (η4‐diene)iron complexes 3a and 3b . Treatment of 3a and 3b with aq. HPF6 and Ac2O provided the title compound 5 , which reacted regio‐ and stereospecifically with some nucleophiles to give the addition products 3b and 7 . 相似文献
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The title compound 2 was readily prepared by MCPBA oxidation of the sulfide 1. Thermal desulfonylation of 2 gave the sulfoxide‐substituted diene 3. The Diels‐Alder reactions of 3 with various dienophiles gave the cyclized products 4‐9 in good yields. The regiochemistry was found to be dominated by the phenylsulfinyl group, but could be reversed by the presence of a Lewis acid. Deprotonation of 2 by BuLi, followed by the reaction with alkyl halides, gave the substituted 2‐sulfolenes 10. A synthetic application of 10 was demonstrated by converting 10e to the bicyclic product 11. 相似文献
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