Chloro(4-methylpent-3-en-1-ynyl)carbene: IR spectrum, structure, photochemical transformations, and reactions with alkenes
作者:V. D. Gvozdev、K. N. Shavrin、E. G. Baskir、M. P. Egorov、O. M. Nefedov
DOI:10.1007/s11172-021-3254-8
日期:2021.8
chloro(4-methylpent-3-en-1-ynyl)carbene generated by photolysis of newly synthesized 5-chloroethynyl-3,3-dimethyl-3H-pyrazole was carried out both in low-temperature argon matrix and in solution at room temperature. Irradiation at 330 nm < λ < 380 nm causes the pyrazole to undergo a selective transformation to 1-chloro-3-diazo-5-methylhexa-4-en-1-yne. Photolysis of the latter at λ >520 nm leads to elimination
在低温氩气基质中对新合成的5-氯乙炔基-3,3-二甲基-3H-吡唑光解产生的以前未知的氯(4-甲基戊-3-烯-1-炔基)卡宾进行了综合研究并在室温下溶解。330 nm < λ < 380 nm 的辐照导致吡唑选择性转化为 1-chloro-3-diazo-5-methylhexa-4-en-1-yne。后者在 λ >520 nm 处的光解导致二氮的消除,从而产生标题卡宾。该物种的关键结构参数是使用矩阵红外光谱和量子化学计算确定的。已经确定卡宾的更稳定状态是单线态。氯 (4-methylpent-3-en-1-ynyl)carbene 的进一步光转化导致异构体 6-chloro-2-methylhexa-1,3-diene-5-yne 的形成。提出了一种合成炔基氯环丙烷的制备方法,收率高达 76%。它基于 5-chloroethynyl-3,3-dimethyl-3H-pyrazole 在苯中在过量的各种烯烃存在下的光解。以