Evidence for Significant Through-Space and Through-Bond Electronic Coupling in the 1,4-Diphenylcyclohexane-1,4-diyl Radical Cation Gained by Absorption Spectroscopy and DFT Calculations
作者:Hiroshi Ikeda、Yosuke Hoshi、Hayato Namai、Futoshi Tanaka、Joshua L. Goodman、Kazuhiko Mizuno
DOI:10.1002/chem.200700820
日期:2007.11.16
formation of an intense electronicabsorptionband at 476 nm, which is attributed to the 1,4-diphenylcyclohexane-1,4-diyl radicalcation. The absorption maximum (lambda(ob)) of this transient occurs at a longer wavelength than is expected for either the cumyl radical or the cumyl cation components. Substitution at the para positions of the phenyl groups in this radicalcation by CH(3)O, CH(3), F, Cl
Catalytic Enantioselective Total Synthesis of (+)–Lycoperdic Acid
作者:Sami Kortet、Aurélie Claraz、Petri M. Pihko
DOI:10.1021/acs.orglett.0c00772
日期:2020.4.17
synthesis of (+)-lycoperdic acid is presented. The stereochemical control is based on iminium-catalyzed Mukaiyama–Michael reaction and enamine-catalyzed organocatalytic α-chlorination steps. The amino group was introduced by azide displacement, affording the final stereochemistry of (+)-lycoperdic acid. Penultimate hydrogenation and hydrolysis afforded pure (+)-lycoperdic acid in seven steps from a known
Luminescent tungsten(<scp>vi</scp>) complexes as photocatalysts for light-driven C–C and C–B bond formation reactions
作者:Daohong Yu、Wai-Pong To、Glenna So Ming Tong、Liang-Liang Wu、Kaai-Tung Chan、Lili Du、David Lee Phillips、Yungen Liu、Chi-Ming Che
DOI:10.1039/d0sc01340d
日期:——
gram-scale is described. This complex could catalyse photochemical organic transformation reactions including borylation of aryl halides, such as aryl chloride, reductive coupling of benzyl bromides for C–C bond formation, reductive coupling of phenacyl bromides, and decarboxylative coupling of redox-active esters of alkyl carboxylic acid with high product yields and broad functional group tolerance.
光催化在实际合成应用中的实现取决于开发可大规模制备的廉价光催化剂。本文描述了一种空气稳定、吸收可见光的光致发光钨 ( VI ) 配合物,可以方便地以克级制备。该配合物可催化光化学有机转化反应,包括芳基卤化物(如芳基氯)的硼化反应、苄基溴还原偶联以形成 C-C 键、苯酰溴的还原偶联以及烷基羧酸的氧化还原活性酯与高产率和广泛的官能团耐受性。
Electrochemical reactivity of S-phenacyl-O-ethyl-xanthates in hydroalcoholic (MeOH/H2O 4:1) and anhydrous acetonitrile media
作者:Ernesto Emmanuel López-López、Sergio J. López-Jiménez、Joaquín Barroso-Flores、Esdrey Rodríguez-Cárdenas、Melina Tapia-Tapia、Gustavo López-Téllez、Luis D. Miranda、Bernardo A. Frontana-Uribe
DOI:10.1016/j.electacta.2021.138239
日期:2021.6
cathodic potentials, let us to explore the synthetic potential of this electrochemical reactions. With some compounds in hydroalcoholic media and using carbon electrodes, polymeric material was deposited on the electrode impeding the reaction; this deposit was characterized by AFM and SEM-EDS. The electroreduction on Ti electrode overcome this problem and gave the corresponding acetophenones (>95%). On
一系列S-苯甲酰基-O-乙基黄原酸酯(O-乙基二硫代碳酸酯苯乙酮衍生物)在水醇(MeOH / H 2 O 4:1)和无水介质(ACN / TBAPF 6)中的电化学行为)使用碳电极进行了研究。循环伏安法显示,在水醇介质中,只有两个阴极波,而在ACN中,存在一个阳极波和两个阴极波。第一个阴极波对应于苯基酮基团的还原,而第一个阳极波则归因于黄原酸酯单元。在阳极和阴极电势下在石墨和玻璃碳上进行宏观电解,让我们探索该电化学反应的合成势。在水醇介质中使用某些化合物并使用碳电极时,聚合物材料沉积在电极上,阻碍了反应;该沉积物通过AFM和SEM-EDS表征。Ti电极上的电还原克服了这个问题,并得到了相应的苯乙酮(> 95%)。另一方面,在ACN中,少量的二聚体1分离出2 CH 2 COPh-X(7-15%)以及相应的苯乙酮(约50%)。氧化大电解显示出非常复杂的转变,没有合成价值。通过DFT计算证实了还原和均解离解成苯甲酰基的反应机理。