本文证明,构成自组装单层 (SAM) 的分子的分子构象(除了组成和结构外)影响通过它们的电荷隧穿 (CT) 速率,在形式为 Au TS / S( CH 2 ) 2 CONR 1 R 2 //Ga 2 O 3 /EGaIn,其中R 1和R 2是不同长度的烷基链。链的长度 R 1和 R 2选择影响单层中分子的构象和构象均匀性。分子的构象影响单层的厚度(即隧道势垒宽度)及其在±1.0 V 时的整流比。当R 1 = H 时,分子有序且主要以反式扩展构象存在。然而,当R 1是烷基(例如,R 1 ≠H)时,它们的构象不再是全反式延伸的,并且分子采用更多的斜切二面角。构象类型的这种变化降低了构象顺序并影响隧穿速率。当 R 1 = R 2,当 R 1 = H 时,相对于通过具有相同总链长或厚度的 SAM 观察到的 CT 速率,CT 速率降低(高达 6.3 倍)。当 R 1 ≠ H ≠ R 2 时,存在较弱
DOI:
10.1021/jacs.0c12571
作为产物:
描述:
alkaline earth salt of/the/ methylsulfuric acid 生成 N-十一烷基乙酰胺
参考文献:
名称:
Hunter, Iowa State College Journal of Science, 1941, vol. 15, p. 228 - 230
O(2), catalyzed by N-hydroxyphthalimide (NHPI) and Co(II) salt, leads undermildconditions to carbonyl derivatives (aldehydes, ketones, carboxylic acids, imides) whose distribution depends on the nature of the alkyl group and on the reaction conditions. Primary N-benzylamides lead to imides and aromatic aldehydes at room temperature without any appreciable amount of carboxylic acids, while under the
A simple and efficient Mn-catalyzed acylation of amines is achieved using both acyl and alkoxy functions of unactivated esters with the liberation of molecular hydrogen as a sole byproduct. The present protocol provides an atom-economical and sustainable route for the synthesis of amides from esters by employing an earth-abundant manganese salt and inexpensive phosphine-free tridentate ligand.
Catalyst-Free, Metal-Free, and Chemoselective Transamidation of Activated Secondary Amides
作者:Srinivasan Chandrasekaran、Rajagopal Ramkumar
DOI:10.1055/s-0037-1610664
日期:2019.2
well. The present methodology appears to be better than the other catalyzed transamidations reported recently. A simple protocol, which is catalyst-free, metal-free, and chemoselective, for transamidation of activated secondary amides in ethanol as solvent under mild conditions is reported. A wide range of amines, amino acids, amino alcohols, and the substituents, which are problematic in catalyzed transamidation
lanthanide catalysts showed high catalytic activity and a wide scope of substrates with good to excellent yields under solvent‐freeconditions. Efficient activation of the transamidation can be realized by the above complexes acting as cooperative acid–base bifunctional catalysts, which are proposed to be responsible for the higher reactivity in comparison with simple monometallic catalysts.
Microwave-assisted preparation of amides using a stable and reusable mesoporous carbonaceous solid acid
作者:Rafael Luque、Vitaly Budarin、James H. Clark、Duncan J. Macquarrie
DOI:10.1039/b821392p
日期:——
An efficient and green microwave assisted protocol to prepare amides from amines via N-acylation using acidic polysaccharide derived mesoporous materials provides quantitative yields of amides in short reaction times.