Electrophilic chemistry of propargylic alcohols in imidazolium ionic liquids: Propargylation of arenes and synthesis of propargylic ethers catalyzed by metallic triflates [Bi(OTf)3, Sc(OTf)3, Yb(OTf)3], TfOH, or B(C6F5)3
作者:Gopalakrishnan Aridoss、Viorel D. Sarca、James F. Ponder Jr、Jessica Crowe、Kenneth K. Laali
DOI:10.1039/c0ob00872a
日期:——
formed. Steric influence of the propargylic moiety on substrate selectivity is reflected in the lack of ortho propargylation for phenol and ethylbenzene by using propargylic alcohol Ia, and notable formation of the ortho isomer employing alcohol Ib. In the later case paraselectivity could be increased by running the reaction at r. t. for 10 h. The Bi(OTf)3-catalyzed reaction of 1,3-dimethoxybenzene with
A theoretical investigation to understand the difference in reactivities of secondary and tertiary propargylic alcohols with 1,3,5‐trimethoxybenzene in presence of Brnøsted acid
作者:Palash Jyoti Boruah、Moumita Debnath、Ankita Agarwal、Gitumoni Kalita、Paresh Nath Chatterjee、Amit Kumar Paul
DOI:10.1002/kin.21714
日期:2024.6
kcal/mol. Other possible pathways, namely, SN1, SN1′, etc. for secondary PA, and SN2, SN1 pathways for tertiary PA are also investigated and the associated barrier heights are found higher. Rates of those reactions are also calculated considering the rate‐determining steps only. Reaction of secondary PA with TMB is found to be much faster than the reaction of tertiary PA and the results are in accordance
本文介绍的工作基于理论计算,建立了仲/叔炔丙醇 (PA) 与 1,3,5-三甲氧基苯 (TMB) 在乙腈溶剂 (MeCN) 存在下反应的实验结果。当二级 PA 反应时,反应通过 S氮2途径,其中反应势垒约为14.32 kcal/mol。另一方面,叔PA通过S与TMB反应氮2′和S氮1′途径,相应的反应势垒为17.59和17.86 kcal/mol。其他可能的途径,即,S氮1、S氮1′等用于辅助 PA,以及 S氮2、S氮还研究了三级 PA 的 1 路径,发现相关的势垒高度更高。这些反应的速率也仅考虑速率确定步骤来计算。发现二级PA与TMB的反应比三级PA的反应快得多,结果与实验结果一致。
Propargylation of Aromatic Compounds with Propargylic Alcohols Catalyzed by a Cationic Diruthenium Complex