Photoinduced oxidative activation of electron-rich arenes: alkenylation with H<sub>2</sub> evolution under external oxidant-free conditions
作者:Xia Hu、Guoting Zhang、Faxiang Bu、Xu Luo、Kebing Yi、Heng Zhang、Aiwen Lei
DOI:10.1039/c7sc04634k
日期:——
An external oxidant-free cross-coupling of electron-rich arenes and styrenes was enabled by a dual photoredox-cobaloxime catalytic system.
一个双光氧化还原-钴络合物催化系统实现了对富电子芳烃和苯乙烯的外部氧化剂自由交叉偶联。
Rate and equilibrium effects of tert-alkyl groups on rotamerization in 3,4-alkylenedioxy-, 3-alkoxy- and 3,4-dialkoxy-2-thienyl(di-tert-alkyl)methanols: an IR, NMR, kinetics and MM studyElectronic supplementary information (ESI) available: additional experimental data. See http://www.rsc.org/suppdata/p2/b2/b203714a/
作者:John S. Lomas、Alain Adenier
DOI:10.1039/b203714a
日期:2002.6.27
rate-equilibrium relationship. Molecularmechanics calculations (MMFF94 force field) account fairly well for the variation in the free energy difference for rotamer pairs of the di-1-adamantyl, (1-adamantyl)(tert-butyl) and di-tert-butyl derivatives, but slightly overestimate the small differences in the equilibrium constants for the three series. The calculatedrotationbarriers for the di-tert-butyl compounds
Hydrogen bonding and steric effects on rotamerization in 3,4-alkylenedioxy-, 3-alkoxy- and 3,4-dialkoxy-2-thienyldi(tert-butyl)methanols: an NMR, IR and X-ray crystallographic studyElectronic supplementary information (ESI) available: NMR data; activation parameters for rotation; MMFF94 steric energies and alkoxy group geometries; thermodynamic data; quantum mechanical calculations of geometries; bond lengths, bond angles and torsion angles of 8A-Et; NMR and IR data on new compounds. See http://www.rsc.org/suppdata/p2/b1/b109612p/
作者:John S. Lomas、Alain Adenier、Kun Gao、François Maurel、Jacqueline Vaissermann
DOI:10.1039/b109612p
日期:2002.1.23
largely determined by steric effects but intramolecular hydrogen bonding in the anti isomer contributes to the variation of the anti → syn rotation barrier. A single crystal X-ray diffraction study of the anti-3,4-diethoxy derivative shows that the orientation of the 3-alkoxy group is very different from that in anti-3-methoxy-2-thienyldi(1-adamantyl)methanol. Molecularmechanics and quantum mechanical calculations