<i>N</i>-arylhexahydropyrimidines. Part 1. Synthesis and<sup>1</sup>H NMR characterization of 1,3-Di and 1,2,3-trisubstituted derivatives
作者:Isabel A. Perillo、María B. García、Juan Á. Bisceglia、Liliana R. Orelli
DOI:10.1002/jhet.5570390409
日期:2002.7
3-propanediamines 2a-h with aldehydes. Reactions with formaldehyde proceeded in hydroalcoholic solution, while condensation with aromatic aldehydes required in general the use of activated molecular sieves. 1H NMRspectra of compounds la-1 were analyzed and the results correlated with their conforma-tional features. Derivatives devoid of a 2-substituent la-g show fast ring reversal and N-inversion. The presence
一系列Ñ -arylhexahydropyrimidines LA-1通过的缩合合成ñ -芳基- ñ “ -烷基(或芳基)-1,3-丙二胺2A-H与醛。与甲醛的反应在水醇溶液中进行,而与芳族醛的缩合通常需要使用活化的分子筛。分析了化合物1a-1的1 H NMR光谱,并将结果与其构型特征相关联。不含2个取代基la-g的衍生物显示快速环逆转和N-反转。2-芳基的存在将环反转平衡移向其中2-芳基取代基是赤道的构象。根据偶联常数和化学位移值对这些化合物中的轴向和赤道氢进行了不同的分配。在化合物1k中,光谱数据表明N-甲基的轴向取向。在相应的NOESY谱图中证实了这些发现。
A Nanocrystal Catalyst Incorporating a Surface Bound Transition Metal to Induce Photocatalytic Sequential Electron Transfer Events
作者:Jovan San Martin、Xianghua Zeng、Xihan Chen、Collin Miller、Chuang Han、Yixiong Lin、Nobuyuki Yamamoto、Xiaoming Wang、Sadegh Yazdi、Yanfa Yan、Matthew C. Beard、Yong Yan
DOI:10.1021/jacs.1c00503
日期:2021.8.4
Veer, Recueil des Travaux Chimiques des Pays-Bas, 1938, vol. 57, p. 989,995