Vibrational Spectrum of <i>m</i>-Benzyne: A Matrix Isolation and Computational Study
作者:Wolfram Sander、Michael Exner、Michael Winkler、Andreas Balster、Angelica Hjerpe、Elfi Kraka、Dieter Cremer
DOI:10.1021/ja012686g
日期:2002.11.1
comparison with CCSD(T) calculations all vibrations between 200 and 2500 cm(-)(1) with a predicted relative intensity >2% could be assigned. All experimental and theoretical results are in accordance with a biradicaloid structure for 2, while there is no evidence for a bicyclic closed-shell structure. While benzyne 2 is stable under the conditions of matrix isolation at low temperature, flash vacuum pyrolysis
间苯炔 (2) 在低温基质中生成,并从四种不同的前体进行红外光谱表征。为了分配红外吸收,还研究了氘代衍生物 2-d(4)。通过与 CCSD(T) 计算相比,200 到 2500 cm(-)(1) 之间的所有振动都可以分配,预测相对强度 >2%。所有的实验和理论结果都符合 2 的双自由基结构,而没有证据表明双环闭壳结构。虽然苄 2 在低温基质分离条件下稳定,但在高温或紫外线照射下快速真空热解会导致重排为顺式烯二炔。提出了一种伴随氢迁移的开环机制。