Cyclometalation Reactions Involving C−Cl Bond Activation of<i>ortho</i>-Chlorinated Substrates with Imine as Anchoring Groups by Cobalt Complexes
作者:Yue Chen、Hongjian Sun、Ulrich Flörke、Xiaoyan Li
DOI:10.1021/om7008793
日期:2008.1.1
ortho-chelated cobalt(III) complexes [CoClMe(PMe3)2(C6H3Clortho)-CH═N−R}] (2a−2e). The reaction of 1b,1c with [CoCl(PMe3)3] delivered the aryl Co(III) complexes 3b,3c containing a [C−Co−Cl] fragment, while Co(II) complexes [CoCl(PMe3)2((C6H3Cl-ortho)CH═N−R)] (3d,3e) were formed through the reaction of 1d or 1e with [CoCl(PMe3)3]. Under similar conditions, the ortho-chelated cobalt(III) complex [CoBrCl(PMe3)2((C6H3Cl2-2
所述aldazines(C 6 H ^ 3氯2 -2,6)CH = N-NH 2(1A)和(C 6 H ^ 3氯2 -2,6)CH = N-N = CH(C 6 H ^ 3氯2 -2,6)(图1b)或席夫碱(C 6 H ^ 3氯2 -2,6)CH = N-CH 3(1C),(C 6 H ^ 3氯2 -2,6)CH = N( C 6 H 5)(1d)和(C 6 H 3 Cl 2通过将2,6-二氯苯甲醛分别与肼,甲胺,苯胺或α-萘胺缩合,得到-2,6)CH 3 N(C 10 H 7)(1e)。用[CoMe(PMe 3)4 ]处理1a - 1e导致C-Cl键的氧化加成,得到邻位螯合的钴(III)络合物[CoClMe(PMe 3)2 (C 6 H 3 Cl邻位)-CH═N-R}](2a - 2e)。的反应1B,1C与[氯化钴(PME 3)3 ]传递含有[C-Co-Cl]片段的芳基Co(III)配