...
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >C-F or C-H bond activation and C-C coupling reactions of fluorinated pyridines at rhodium:synthesis,structure and reactivity of a variety of tetrafluoropyridyl complexes
【24h】

C-F or C-H bond activation and C-C coupling reactions of fluorinated pyridines at rhodium:synthesis,structure and reactivity of a variety of tetrafluoropyridyl complexes

机译:氟化吡啶在吡啶鎓上的C-F或C-H键活化和C-C偶联反应:各种四氟吡啶基配合物的合成,结构和反应性

获取原文
获取原文并翻译 | 示例
           

摘要

Reactions of [RhH(PEt_3)_3] (1) or [RhH(PEt_3)_4] (2) with pentafluoropyridine or 2,3,5,6-tetrafluoropyridine afford the activation product [Rh(4-C5NF_4)(PEt_3)_3] (3).Treatment of 3 with CO,~(13)CO or CN?Bu effects the formation of trans-[Rh(4-C_5NF_4)(CO)(PEt_3)_2] (4a),trans-[Rh(4-C_5NF_4)(~(13)CO)(PEt_3)_2] (4b) and trans-[Rh(4-C_5NF_4)(CNtBu)-(PEt_3)_2] (5).The rhodium(III) compounds trans-[RhI(CH_3)(4-C_5NF_4)(PEt_3)_2] (6a) and trans-[RhI(~(13)CH_3)(4-C_5NF_4)-(PEt_3)_2] (6b) are accessible on reaction of 3 with CH_3I or ~(13)CH_3I.In the presence of CO or ~(13)CO these complexes convert into trans-[RhI(CH_3)(4-C_5NF_4)(CO)(PEt_3)_2] (7a),trans-[RhI(~(1)3CH_3)(4-C_5NF_4)(CO)(PEt_3)_2] (7b) and trans-[RhI(~(13)CH_3)(4-C_5NF_4)(~(13)CO)(PEt_3)_2] (7c).The trans arrangement of the carbonyl and methyl ligand in 7a-7c has been confirmed by the ~(13)C-~(13)C coupling constant in the ~(13)C NMR spectrum of 7c.A reaction of 4a or 4b with CH_3I or ~(13)CH,I yields the acyl compounds trans-[RhI(COCH_3)(4-C_5NF_4)(PEt_3)_2] (8a) and trans-[RhI(~(13)CO~(13)CH_3)-(4-C_5NF_4)(PEt_3)_2] (8b),respectively.Complex 8a slowly reacts with more CH_3I to give [PEt,Me][Rh(I)_2(COCH_3)-(4-C_5NF_4)(PEt_3)] (9).On heating a solution of 7a,the complex trans-[RhI(CO)(PEt_3)_2] (10) and the C-C coupled product 4-methyltetrafluoropyridine (11) have been obtained.Complex 8a also forms 10 at elevated temperatures in the presence of CO together with the new ketone 4-acetyltetrafluoropyridine (12).The structures of the complexes 3,4a,5,6a,8a and 9 have been determined by X-ray crystallography.~(19)F-~1H HMQC NMR solution spectra of 6a and 8a reveal a close contact of the methyl groups in the phosphine to the methyl or acyl ligand bound at rhodium.
机译:[RhH(PEt_3)_3](1)或[RhH(PEt_3)_4](2)与五氟吡啶或2,3,5,6-四氟吡啶的反应得到活化产物[Rh(4-C5NF_4)(PEt_3)_3 ](3)。用CO,〜(13)CO或CN?Bu处理3影响反式-[Rh(4-C_5NF_4)(CO)(PEt_3)_2](4a),反式-[Rh( 4-C_5NF_4)(〜(13)CO)(PEt_3)_2](4b)和反式-[Rh(4-C_5NF_4)(CNtBu)-(PEt_3)_2](5)。铑(III)化合物反- [RhI(CH_3)(4-C_5NF_4)(PEt_3)_2](6a)和反式[RhI(〜(13)CH_3)(4-C_5NF_4)-(PEt_3)_2](6b)在反应3时可访问在存在CO或〜(13)CO的情况下,这些络合物转化为反式[RhI(CH_3)(4-C_5NF_4)(CO)(PEt_3)_2](7a),反式[RhI(〜(1)3CH_3)(4-C_5NF_4)(CO)(PEt_3)_2](7b)和反式[RhI(〜(13)CH_3)(4-C_5NF_4)(〜(13)CO)( PEt_3)_2](7c)。已通过7c的〜(13)C NMR谱中的〜(13)C-〜(13)C偶联常数证实了7a-7c中羰基和甲基配体的反式排列4a或4b与CH_3I或〜(13)CH,I的反应产生酰基化合物s- [RhI(COCH_3)(4-C_5NF_4)(PEt_3)_2](8a)和反式-[RhI(〜(13)CO〜(13)CH_3)-(4-C_5NF_4)(PEt_3)_2](8b络合物8a与更多的CH_3I缓慢反应生成[PEt,Me] [Rh(I)_2(COCH_3)-(4-C_5NF_4)(PEt_3)](9)。在加热7a溶液时,络合物已获得反式[RhI(CO)(PEt_3)_2](10)和CC偶联产物4-甲基四氟吡啶(11)。络合物8a在高温和CO存在下与新酮4-一起形成10。乙酰四氟吡啶(12)。配合物3,4a,5,6a,8a和9的结构已通过X射线晶体学测定。〜(19)F ~~ 1H HMQC NMR溶液图谱6a和8a显示紧密接触膦中的甲基与在铑上结合的甲基或酰基配体的键合。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号