Synthesis of Trialkylamines with Extreme Steric Hindrance and Their Decay by a Hofmann-like Elimination Reaction.
Synthesis of Trialkylamines with Extreme Steric Hindrance and Their Decay by a Hofmann-like Elimination Reaction.
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具有极端空间位阻的三烷基胺的合成及其通过类霍夫曼消除反应的衰变
DOI:
10.1021/acs.joc.0c01790
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
P. R. Rablen
中科院分区:
文献类型:
--
作者:
K. Banert;M. Hagedorn;M. Heck;R. Hertel;A. Ihle;I. Müller;T. Pester;T. Shoker;P. R. Rablen
A number of amines with three bulky alkyl groups at the nitrogen, which surpass the steric crowding of triisopropylamine considerably, were prepared by using different synthetic methods. It turned out that treatment ofN-chlorodialkylamines with organometallic compounds, for example, Grignard reagents, in the presence of a major excess of tetramethylenediamine offered the most effective access to the target compounds. The limits of this method were also tested. The trialkylamines underwent a dealkylation reaction, depending on the degree of steric stress, even at ambient temperature. Because olefins were formed in this transformation, it showed some similarity with the Hofmann elimination. However, the thermal decay of sterically overcrowded tertiary amines was not promoted by bases. Instead, this reaction was strongly accelerated by protic conditions and even by trace amounts of water. Reaction mechanisms, which were analyzed with the help of quantum chemical calculations, are suggested to explain the experimental results.
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影响因子:
0.7
作者:
E. Corey;A. Gross
通讯作者:
A. Gross
影响因子:
2.3
作者:
J. Read;J. A. Hendry
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J. A. Hendry
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作者:
K. Chan;X. Li;Siu Yin Lee
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Siu Yin Lee
DOI:
10.1039/jr9520000153
发表时间:
1952
期刊:
Journal of The Chemical Society (resumed)
影响因子:
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作者:
N. McNiven;J. Read
通讯作者:
J. Read
影响因子:
15
作者:
A. C. Cope;G. A. Berchtold;D. L. Ross
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