当前位置:
X-MOL 学术
›
Inorg. Chem.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Reactions of Low-Coordinate Cobalt(0)–N-Heterocyclic Carbene Complexes with Primary Aryl Phosphines
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2018-12-03 00:00:00 , DOI: 10.1021/acs.inorgchem.8b02937 Dongyang Wang 1 , Qi Chen 1 , Xuebing Leng 1 , Liang Deng 1
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2018-12-03 00:00:00 , DOI: 10.1021/acs.inorgchem.8b02937 Dongyang Wang 1 , Qi Chen 1 , Xuebing Leng 1 , Liang Deng 1
Affiliation
Aiming to get knowledge on the reactivity of low-coordinate cobalt(0) species toward primary phosphines, the reactions of [(IPr)Co(vtms)2] and [(ICy)2Co(vtms)] (IPr = 1,3-bis(2′,6′-diisopropylphenyl)imidazol-2-ylidene, ICy = 1,3-dicyclohexylimidazol-2-ylidene, and vtms = vinyltrimethylsilane) with several primary aryl phosphines have been examined. The reactions of [(IPr)Co(vtms)2] and [(ICy)2Co(vtms)] with H2PDmp (Dmp = 2,6-dimesitylphenyl) at 80 °C furnish the diamagnetic cobalt(I) phosphido complexes [(NHC)Co(PHDmp)] (NHC = IPr, 1; ICy, 2) that feature the Co–(η6-mesityl) interaction. Complex 1 can coordinate CO to generate the terminal phosphido complex [(IPr)Co(CO)3(PHDmp)] (3) and can be oxidized by [Cp2Fe][BArF4] to yield the cobalt(II) phosphido complex [(IPr)Co(PHDmp)][BArF4] (4, BArF4 = tetrakis(3,5-di(trifluoromethyl)phenyl)borate). For the reactions with sterically less-hindered primary phosphines, [(IPr)Co(vtms)2] is inert toward H2PC6H2-2,4,6-Me3 (H2PMes) at room temperature, whereas [(ICy)2Co(vtms)] can react with H2PMes at room temperature to produce the cobalt(II) phosphido alkyl complex trans-[(ICy)2Co(CH2CH2SiMe3)(PHMes)] (5). At 80 °C, the cobalt(0) alkene complexes [(IPr)Co(vtms)2] and [(ICy)2Co(vtms)] and also the cobalt phosphido complexes, 1, 2, and 5 can serve as precatalysts for the dehydrocoupling reaction of H2PMes to afford MesHPPHMes. NHC–Co(I)-phosphido species are proposed as the in-cycle intermediates for these cobalt-catalyzed dehydrocoupling reactions.
中文翻译:
低配位钴(0)–N-杂环碳烯配合物与伯芳基膦的反应
为了了解低配位钴(0)对初级膦的反应性,[(IPr)Co(vtms)2 ]和[(ICy)2 Co(vtms)](IPr = 1,3已经研究了具有多个伯芳基膦的-双(2',6'-二异丙基苯基)咪唑-2-亚烷基,ICy = 1,3-二环己基咪唑-2-亚烷基,并且vtms =乙烯基三甲基硅烷)。[(IPr)Co(vtms)2 ]和[(ICy)2 Co(vtms)]与H 2 PDmp(Dmp = 2,6-dimesitylphenyl)在80°C的反应提供了抗磁性的钴(I)磷酸酯络合物[(NHC)的Co(PHDmp)](NHC =的IPr,1 ;的ICy,2),其特征CO-(η 6 -基)相互作用。综合大楼1可以协调CO生成末端磷酸酯络合物[(IPr)Co(CO)3(PHDmp)](3),并可以被[Cp 2 Fe] [BAr F 4 ]氧化,生成钴(II)磷酸酯络合物[ (IPr)Co(PHDmp)] [BAr F 4 ](4,BAr F 4=四(3,5-二(三氟甲基)苯基)硼酸酯。为了与在空间上的反应较少-阻碍的伯膦,[(IPR)的Co(VTMS)2 ]是惰性的朝向ħ 2 PC 6 H ^ 2 -2,4,6--ME 3(H 2个在室温下机动设备),而[ (ICy)2 Co(vtms)]可与H反应在室温下2 PMes制备钴(II)磷烷基烷基络合物反式-[(ICy)2 Co(CH 2 CH 2 SiMe 3)(PHMes)](5)。在80℃时,钴(0)烯烃配合物[(IPR)的Co(VTMS)2 ]和[(的ICy)2的Co(VTMS)]和也是钴膦络合物,1,2,和5可以作为预催化剂H 2 PMes的脱氢偶联反应得到MesHPPHMes。NHC–Co(I)-磷化物被提议作为这些钴催化的脱氢偶联反应的循环中间体。
更新日期:2018-12-03
中文翻译:
低配位钴(0)–N-杂环碳烯配合物与伯芳基膦的反应
为了了解低配位钴(0)对初级膦的反应性,[(IPr)Co(vtms)2 ]和[(ICy)2 Co(vtms)](IPr = 1,3已经研究了具有多个伯芳基膦的-双(2',6'-二异丙基苯基)咪唑-2-亚烷基,ICy = 1,3-二环己基咪唑-2-亚烷基,并且vtms =乙烯基三甲基硅烷)。[(IPr)Co(vtms)2 ]和[(ICy)2 Co(vtms)]与H 2 PDmp(Dmp = 2,6-dimesitylphenyl)在80°C的反应提供了抗磁性的钴(I)磷酸酯络合物[(NHC)的Co(PHDmp)](NHC =的IPr,1 ;的ICy,2),其特征CO-(η 6 -基)相互作用。综合大楼1可以协调CO生成末端磷酸酯络合物[(IPr)Co(CO)3(PHDmp)](3),并可以被[Cp 2 Fe] [BAr F 4 ]氧化,生成钴(II)磷酸酯络合物[ (IPr)Co(PHDmp)] [BAr F 4 ](4,BAr F 4=四(3,5-二(三氟甲基)苯基)硼酸酯。为了与在空间上的反应较少-阻碍的伯膦,[(IPR)的Co(VTMS)2 ]是惰性的朝向ħ 2 PC 6 H ^ 2 -2,4,6--ME 3(H 2个在室温下机动设备),而[ (ICy)2 Co(vtms)]可与H反应在室温下2 PMes制备钴(II)磷烷基烷基络合物反式-[(ICy)2 Co(CH 2 CH 2 SiMe 3)(PHMes)](5)。在80℃时,钴(0)烯烃配合物[(IPR)的Co(VTMS)2 ]和[(的ICy)2的Co(VTMS)]和也是钴膦络合物,1,2,和5可以作为预催化剂H 2 PMes的脱氢偶联反应得到MesHPPHMes。NHC–Co(I)-磷化物被提议作为这些钴催化的脱氢偶联反应的循环中间体。