Effect of Through-Bond Interaction on Conformation and Structure in Rod-Shaped Donor–Acceptor Systems. Part 2.
作者:Dirk J. A. De Ridder、Kees Goubitz、Henk Schenk、Bert Krijnen、Jan W. Verhoeven
DOI:10.1002/hlca.200390082
日期:2003.3
together with the derivatives 1T2 and 4T2 published previously. The piperidine ring adopts a chair conformation. In all structures, the aryl group is in the axial position, with the plane through the aryl C-atoms nearly perpendicular to the mirror plane of the piperidine ring. The through-bond interaction between the piperidine ring N-atom (one-electron donor) and the substituted exocyclic CC bond (acceptor)
给出了七个N-芳基tropan-3-one(= 8-芳基-8-氮杂双环[3.2.1] octan -3-one)衍生物1T1、2T1、2T2、3T2、5T2、2T3和3T3的晶体结构(图2和表1 - 5),并与衍生物一起讨论1T2和4T2先前已发布。哌啶环采用椅子构型。在所有结构中,芳基均处于轴向位置,穿过芳基C原子的平面几乎垂直于哌啶环的镜平面。哌啶环的N原子(单电子供体)与取代的环外CC键(受体)之间的全键相互作用不仅延长了哌啶环的中心CC键,而且还提高了哌啶环的C(4)处的嘧啶化作用。哌啶环。哌啶环的C(2)–C(6)部分变平会降低通过键的相互作用。