The evaluation of the role of C–H⋯F hydrogen bonds in crystal altering the packing modes in the presence of strong hydrogen bond
作者:Gurpreet Kaur、Sandhya Singh、Amritha Sreekumar、Angshuman Roy Choudhury
DOI:10.1016/j.molstruc.2015.10.105
日期:2016.2
found to form strong O–H⋯N hydrogen bond, but the spatial arrangement of the molecules connected by this hydrogen bond have been found to be controlled by the weak C–H⋯F and C–H⋯O hydrogenbonds, weak C–H⋯π and π⋯π interactions. This manuscript illustrates the importance of several weaker interactions in altering the packing modes in the presence of strong hydrogenbonds.
[EN] NOVEL (1,3-BUTADIEN-2-YL)METHYLAMINE DERIVATIVES AND PREPARATION METHOD THEREOF<br/>[FR] NOUVEAUX DÉRIVÉS DE (1,3-BUTADIÈNE-2-YL)MÉTHYLAMINE ET PROCÉDÉ DE PRÉPARATION DE CEUX-CI
申请人:KNU INDUSTRY COOPERATION FOUND
公开号:WO2010035948A1
公开(公告)日:2010-04-01
The present invention provides a novel (1,3-butadien-2-yl)methylamine derivative and a preparation method thereof. The (1,3-butadien-2-yl)methylamine derivative having the 1,3-diene substituent at the alpha-position is an useful precursor in preparing various amine compounds having biochemical activities.
Schiff bases Ar1CH=NAr2 that are refractory towards Et3Al are activated at room temperature by cerium(IV) compounds. The ethylation takes place selectively at the methine moiety of the imine. The process is strongly influenced by steric hindrance and depends on the electronic nature of the substrate: electron-donating substituents promote the reaction while electron-withdrawing groups cause it to slow down. Application of cerium(IV) ammonium nitrate as promoter gives the best results. In the absence of excess Et3Al it causes, however, transformation of the Schiff base to the corresponding aldehydes and amines.
The antioxidant effect of imine resveratrol analogues
作者:Jing Lu、Chang Li、Yun-Feng Chai、De-Yu Yang、Cui-Rong Sun
DOI:10.1016/j.bmcl.2012.06.026
日期:2012.9
Twenty five Imine resveratrol analogues (IRAs) were synthesized, replacing the C=C bond in resveratrol with C=N bond, as well as substitution modifications on aromatic rings. Radical scavenging activities against DPPH, along with singlet oxygen quenching capacities were evaluated, and further confirmed using density functional theory calculations (DFT). It was found that IRAs bearing ortho-OH on B ring have better radical scavenging activities against DPPH than resveratrol, these compounds were also found to be effective O-1(2) quenchers. Theoretical studies on the reaction mechanism of these compounds with O-1(2) suggest that the 1,3-addition to a double bond with a -OH group with the formation of allylic hydroperoxide is the most probable reaction route. (C) 2012 Elsevier Ltd. All rights reserved.