Carbon-13 NMR spectra of allylic boron "ate" complexes clearly indicate, for the first time, the relative importance of σ-π conjugation between the double bond and the carbon-boron bond.doi:10.1016/0040-4039(80)80246-2Yoshinori Yamamoto...
General procedure for consecutive C-C bond cleavage products To a 50 ml round bottomed flask equipped with a magnetic stirrer bar were added acid (0.5 mmol, 1.0 equiv.), Ir-1 or Ir-2 (0.015 mmol, 0.03 equiv.), Cu(OAc)2 (18.1 mg, 0.1 mmol, 0.2 equiv.), 2,2′...
13C NMR SPECTRA OF ALKENYLBORANES. EVIDENCE FOR THE PRESENCE OF π-CHARACTER IN THE B–C BOND 喜欢 0 阅读量: 13 作者:Y Yamamoto,I Moritani 摘要: The strong deshieldlng of the β-carbon atom in the C NMR spectra of α,β-unsaturated alkenylboranes supports the presence of π-...
The uniquecis-to-transphotoisomerization could be utilized to identify thecis- ortrans-C=C bonds in lipids when combined with LC-MS analysis. The C=C bond in a monounsaturated lipid would be identified ascis-configuration if the second peak corresponds to itstrans-isomer appeared with a longer ...
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Copper(I) catalysts are usually ineffective on the other hand Pd(II) catalysts are quite effective in promoting intramolecular sp2 C–H functionalization (C–S bond formation). Herein, we have developed a ligand assisted Pd(II) catalyzed C–S bond formation via C–H activation from arylthiourea...
Drift X-ray: core electron excitation UV: valance electronic excitation IR: molecular vibrations Radio waves: Nuclear spin states (in a magnetic field) 200~400 nm,常用紫外区 400~700 nm,可见区 200 nm,真空紫外区 900 nm,近红外区 仪器的波长范围: 190 - 900 nm 190 -1100 nm 190 -3300 nm ...
Compared to H2-assisted activation mode, the direct dissociation of CO2 into carbonyl (*CO) with a simplified reaction route is advantageous for CO2-related synthetic processes and catalyst upgrading, while the stable C = O double bond makes it very challenging. Herein, we construct a subna...
. The simulated IR spectra of CO adsorptions on the surfaces of Cu and Cu2O are in good agreement with the experimental SEIRA spectra. Noticeably, the vibrational intensity of adsorbed CO bands on the Cu2O catalysts using GNSs is significantly enhanced compared to that using CDFs as the ...