H 2 Activation across Manganese(I)–C Bonds: Atypical Metal–Ligand Cooperativity in the Aromatization/Dearomatization Paradigm

H 2 Activation across Manganese(I)–C Bonds: Atypical Metal–Ligand Cooperativity in the Aromatization/Dearomatization Paradigm
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锰(I)-C键上的H 2 活化:芳构化/脱芳构范式中的非典型金属-配体协同性

DOI:
10.1021/acs.organomet.1c00606
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发表时间:
2022
期刊:
影响因子:
2.8
通讯作者:
Lacy, David C.
Lacy, David C.
中科院分区:
化学2区
文献类型:
--
作者:
Vigneswaran, Vipulan;Abhyankar, Preshit C.;MacMillan, Samantha N.;Lacy, David C.

文献摘要

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脱卤化offac-Mn(κ2-N,P-PicP)(CO)3Br(1H)和fac-Mn(κ2-N,P-LutP)(CO)3Br(1 Me)与等摩尔K[N(SiMe 3)] 2反应,得到具有反应活性的芳构化18电子配合物fac-Mn(κ3-N,C,P-PicP)(CO)3(2H)和fac-Mn(κ3-N,C,P-LutP)(CO)3(2 Me),具有非典型结合模式。2 Hand 2 Me通过Mn(I)-C键活化H2,得到氢化物配合物fac-Mn(κ2-N,P-PicP)(CO)3H(4H)和fac-Mn(κ2-N,P-LutP)(CO)3H(4Me)。观察到2 Me和2 Me都能生成脱芳构化的18电子配合物Mn(κ2-N,P-PicP*)(CO)4(3H)和Mn(κ2-N,P-LutP*)(CO)4(3 Me)。2 Hand 2 Me的反应性Mn(I)-C部分与各种亲电试剂反应:苯乙腈制甲酸锰(κ3-N,N′,P-(LutP-BnCN))(CO)3(6),E-查耳酮形成-Mn(κ3-N,C,P-LutP-查耳酮)(CO)3(7)与AlCl 3反应,生成fac-Mn(κ3-N,Cl,P-PicP-AlCl 3)(CO)3(8H)和fac-Mn(κ3-N,Cl,P-LutP-AlCl 3)(CO)3(8 Me),分子内含有少量Mn-(μ-Cl)-Al结构。探索了Mn(I)催化的Michael加成反应。1H与醇盐脱卤化氢得到取代配合物fac-Mn(κ2-N,P-PicP)(OR)(CO)3(10 H),该配合物也能与H2反应生成4 H。在与醇盐碱相同的条件下,1 Me提供2 Me,表现出二分行为。我们还研究了1Hand 1 Me(分别为11 Hand 11 Me)的iPr取代类似物,发现它们在行为上基本相同。配合物1 Rand 11 R是一种优良的苯乙烯加氢催化剂。本文简要讨论了本文发现的κ3-N,C,P结合模式与催化作用的关系。
Dehydrohalogenation offac-Mn(κ2-N,P-PicP)(CO)3Br (1H) andfac-Mn(κ2-N,P-LutP)(CO)3Br (1Me) with equimolar K[N(SiMe3)]2afforded the reactive, aromatized 18-electron complexesfac-Mn(κ3-N,C,P-PicP)(CO)3(2H) andfac-Mn(κ3-N,C,P-LutP)(CO)3(2Me), respectively, with atypical binding modes.2Hand2Meactivate H2across the Mn(I)–C bond to furnish hydride complexesfac-Mn(κ2-N,P-PicP)(CO)3H (4H) andfac-Mn(κ2-N,P-LutP)(CO)3H (4Me), respectively. Both2Hand2Mewere observed to produce dearomatized 18-electron complexes Mn(κ2-N,P-PicP*)(CO)4(3H) and Mn(κ2-N,P-LutP*)(CO)4(3Me), respectively, when reacted with CO. The reactive Mn(I)–C moiety of2Hand2Mereacts with a variety of electrophiles: benzyl cyanide to formfac-Mn(κ3-N,N′,P-(LutP-BnCN))(CO)3(6),E-chalcone to formfac-Mn(κ3-N,C,P-LutP-chalcone)(CO)3(7), and AlCl3to formfac-Mn(κ3-N,Cl,P-PicP-AlCl3)(CO)3(8H) andfac-Mn(κ3-N,Cl,P-LutP-AlCl3)(CO)3(8Me) featuring a rare intramolecular Mn-(μ-Cl)-Al moiety. Mn(I)-catalyzed Michael addition was explored. Dehydrohalogenation of1Hwith alkoxides afforded the substituted complexfac-Mn(κ2-N,P-PicP)(OR)(CO)3(10H) that was also reactive toward H2forming4H. Under identical conditions with alkoxide bases,1Meaffords2Medemonstrating dichotomous behavior. We also explored theiPr-substituted analogues of1Hand1Me(11Hand11Me, respectively) and found them to be essentially identical in behavior. Complexes1Rand11Rwere found to be excellent catalysts for styrene hydrogenation. The relevance of the κ3-N,C,Pbinding mode discovered herein to catalysis is briefly discussed.