Hydrosilylation of Aldehydes and Formates Using a Dimeric Manganese Precatalyst
Hydrosilylation of Aldehydes and Formates Using a Dimeric Manganese Precatalyst
复制标题
使用二聚锰预催化剂进行醛和甲酸酯的氢化硅烷化
DOI:
10.1021/acs.organomet.7b00423
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发表时间:
2017
期刊:
影响因子:
2.8
通讯作者:
Trovitch, Ryan J.
中科院分区:
文献类型:
--
作者:
Mukhopadhyay, Tufan K.;Ghosh, Chandrani;Flores, Marco;Groy, Thomas L.;Trovitch, Ryan J.
The formally zero-valent Mn dimer [(Ph2PEtPDI)Mn]2has been synthesized upon reducing (Ph2PEtPDI)MnCl2with excess Na/Hg. Single crystal X-ray diffraction analysis has revealed that [(Ph2PEtPDI)Mn]2possesses a κ4-PDI chelate about each Mn center, as well as η2-imine coordination across the dimer. The chelate metrical parameters suggest single electron PDI reduction and EPR spectroscopic analysis afforded a signal consistent with two weakly interactingS=1/2Mn centers. At ambient temperature in the absence of solvent, [(Ph2PEtPDI)Mn]2has been found to catalyze the hydrosilylation of aldehydes at loadings as low as 0.005 mol % (0.01 mol % relative to Mn) with a maximum turnover frequency of 9,900 min–1(4,950 min–1per Mn). Moreover, the [(Ph2PEtPDI)Mn]2-catalyzed dihydrosilylation of formates has been found to proceed with turnover frequencies of up to 330 min–1(165 min–1relative to Mn). These metrics are comparable to those described for the leading Mn catalyst for this transformation, the propylene-bridged variant (Ph2PPrPDI)Mn; however, [(Ph2PEtPDI)Mn]2is more easily inhibited by donor functionalities. Carbonyl and carboxylate hydrosilylation is believed to proceed through a modified Ojima mechanism following dimer dissociation.
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DOI:
10.1021/bk-1996-0641
发表时间:
1996-08
期刊:
--
影响因子:
--
作者:
A. Abdel-Magid
通讯作者:
A. Abdel-Magid
影响因子:
2.3
作者:
Khusniyarov, Marat M.;Harms, Klaus;Sundermeyer, Joerg
通讯作者:
Sundermeyer, Joerg
影响因子:
15
作者:
Mukhopadhyay, Tufan K.;Flores, Marco;Trovitch, Ryan J.
通讯作者:
Trovitch, Ryan J.
影响因子:
2.8
作者:
S. U. Son;Se-Jung Paik;In Su Lee;Young-a Lee;Y. Chung;Won K. Seok;Heung-N. Lee
通讯作者:
S. U. Son;Se-Jung Paik;In Su Lee;Young-a Lee;Y. Chung;Won K. Seok;Heung-N. Lee
影响因子:
2
作者:
J. Nakanishi;Hiroto Tatamidani;Y. Fukumoto;N. Chatani
通讯作者:
N. Chatani