How Protic Solvents Determine the Reaction Mechanisms of Diphenylcarbene in Solution.
How Protic Solvents Determine the Reaction Mechanisms of Diphenylcarbene in Solution.
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质子溶剂如何确定溶液中二苯基卡宾的反应机理
DOI:
10.1021/acs.joc.9b01228
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
P. Nuernberger
中科院分区:
文献类型:
--
作者:
J. Knorr;P. Sokkar;P. Costa;W. Sander;E. Sanchez-Garcia;P. Nuernberger
We investigate the effects of small admixtures of protic solvent molecules, such as water and alcohols, on the ultrafast dynamics of diphenylcarbene in acetonitrile at room temperature. Broadband transient absorption measurements and quantum mechanics/molecular mechanics molecular dynamics simulations allow elucidating the dominant reaction mechanism of an intermediate hydrogen-bonded complex between singlet diphenylcarbene and a protic solvent molecule, thus competing with intersystem crossing. Analysis of the data indicates that complex formation is a diffusion-controlled process with orientational requirements. The reaction path involving a benzhydryl cation is less likely in neat bulkier alcohols, as it requires the interaction of the carbene with a protic solvent molecule being part of a hydrogen-bonded network. The simulations indicate a further reaction path toward O–H insertion and two side reactions depending on the involved protic solvent species. Thus, we established that not only the number but also the chemical nature of the protic solvent molecule determine which reaction path is pursued.
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DOI:
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发表时间:
1998
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影响因子:
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作者:
S. Steenken
通讯作者:
S. Steenken
DOI:
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发表时间:
1980
期刊:
影响因子:
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作者:
K. Eisenthal;N. Turro;M. Aikawa;J. Butcher;C. Dupuy;G. Hefferon;W. Hetherington;G. Korenowski;M. McAuliffe
通讯作者:
M. McAuliffe
DOI:
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发表时间:
1951
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影响因子:
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作者:
G. Kortüm;G. Dreesen
通讯作者:
G. Dreesen
DOI:
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发表时间:
1982
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影响因子:
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作者:
Y. Wang;E. Sitzmann;F. Novak;C. Dupuy;K. Eisenthal
通讯作者:
K. Eisenthal
DOI:
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发表时间:
1983
期刊:
影响因子:
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作者:
E. Sitzmann;J. Langan;K. Eisenthal
通讯作者:
K. Eisenthal