Methanol Promoted Palladium‐Catalyzed Amine Formylation with CO
<sub>2</sub>
and H
<sub>2</sub>
by the Formation of HCOOCH
<sub>3</sub>
作者:Yanyan Wang、Bingfeng Chen、Shulin Liu、Xiaojun Shen、Shaopeng Li、Youdi Yang、Huizhen Liu、Buxing Han
DOI:10.1002/cctc.201801404
日期:2018.11.22
The N‐formylation reaction of amines is one of the most effective measures to make the best use of CO2, since the formamides have widespread applications in industry. Herein, we performed the N‐formylation reaction over Mg−Allayereddoublehydroxide (Mg−Al LDH) supported Pd catalyst (Pd/LDH) for the first time and studied the relation between the solvent and the mechanism. In this reaction, the methanol
Gas-Phase <sup>1</sup>H NMR Studies of Internal Rotation Activation Energies and Conformer Stabilities of Asymmetric <i>N,N</i>-Disubstituted Formamides and Trifluoroacetamides
作者:A. N. Taha、S. M. Neugebauer Crawford、N. S. True
DOI:10.1021/jp9734080
日期:1998.2.1
Activation parameters and conformational stabilities characterizing the internal rotation about the peptide bond in a series of N,N-asymmetric dialkylformamides (HCONR1R2: R-1 = CH3, R-2 = propyl, butyl, and isopropyl) and N,N-asymmetric dialkyltrifluoroacetamides (F3CCONR1R2: R-1 = CH3, R-2 = propyl, butyl, and isopropyl) are determined from temperature-dependent gas-phase H-1 NMR spectra. Conformer free energy differences, Delta G(298)(0)(syn-anti), in cal mol(-1), and activation free energies, Delta G(298)(double dagger), in kcal mol(-1), for the formamides are -83(14)/19.4(0.1) for R-2 = Propyl, -80(14)/19.3(0.1) for R-2 = butyl, and -91(13)/19.1(0.1) for R-2 = isopropyl and for the trifluoroacetamides 178(24)/16.8(0.1) for R-2 = propyl, 191(53)/16.6(0.1) for R-2 = butyl, and 218(29)/16.3(0.1) for R-2 = isopropyl. The preferred conformer in both the gas and Liquid phases has the N-methyl group syn to the carbonyl oxygen in the formamide systems and the N-methyl group anti to the carbonyl oxygen in the trifluoroacetamides. The gas-phase results are compared to liquid-phase values.