Notable Substituent Effects on the Rate Constant of Thermal Denitrogenation of Cyclic Azoalkanes : Strong Evidence for a Stepwise Denitrogenation Mechanism

Australian Journal of Chemistry 63 巻 12 号 1615-1618 頁 2010-12-06 発行
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タイトル ( eng )
Notable Substituent Effects on the Rate Constant of Thermal Denitrogenation of Cyclic Azoalkanes : Strong Evidence for a Stepwise Denitrogenation Mechanism
作成者
Ishihara Chizuko
収録物名
Australian Journal of Chemistry
63
12
開始ページ 1615
終了ページ 1618
抄録
The thermal denitrogenation rates (k) of a series of 7,7-dimethoxy-1,4-diaryl-2,3-diazabicyclo[2.2.1] hept-2-ene derivatives 2 with a variety of aryl groups (p-CNC6H4, C6H5, p-MeC6H4, p-MeOC6H4) were determined to investigate the denitrogenation mechanism. A linear correlation (r=0.988) between the relative rate-constant (log k(rel)) of the denitrogenation reaction and Arnold's sigma(.)(alpha) parameter for benzylic-type radical-stabilization was observed. However, the relative rate-constant was not correlated with the substituent effect on the lifetime of the resulting singlet diradicals DR2. These results indicate that the rate-determining step of denitrogenation of 7,7-dimethoxy-2,3-diazabicyclo[2.2.1] hept-2-ene derivatives involves stepwise C-N bond cleavage.
NDC分類
化学 [ 430 ]
言語
英語
資源タイプ 学術雑誌論文
出版者
Csiro Publishing
発行日 2010-12-06
権利情報
Copyright (c) 2010 CSIRO
出版タイプ Author’s Original(十分な品質であるとして、著者から正式な査読に提出される版)
アクセス権 オープンアクセス
収録物識別子
[ISSN] 0004-9425
[DOI] 10.1071/CH10281
[NCID] AA00555860
[DOI] http://dx.doi.org/10.1071/CH10281