作者:V. L. Novikov、V. P. Glazunov、N. N. Balaneva、O. P. Shestak
DOI:10.1007/s11172-022-3652-6
日期:2022.10
The experimental and theoretical studies of the reactions of 5,5-dimethylcyclohexane-1,3-dione (dimedone) with trimethyl- and triethyl orthoformates under various conditions were carried out. It was demonstrated that in the absence of activators the reactions of substrate with ortho esters proceed exclusively as C-C coupling, and in the presence of Brønsted (H2SO4) or Lewis (BF3·Et2O) acids the formation of both C-C and C-O coupling products is observed. The energy consumptions of all reactions in accordance with proposed mechanisms were estimated using quantum chemical calculations by the B3LYP/6-311++G(d,p) method in terms of PCM/MeCN.
对5,5-二甲基环己烷-1,3-二酮(二甲酮)与原甲酸三甲酯和原甲酸三乙酯在各种条件下的反应进行了实验和理论研究。结果表明,在没有活化剂的情况下,底物与原酯的反应仅以C-C偶联的方式进行,而在有布伦斯特(H2SO4)或路易斯(BF3·Et2O)酸的情况下,观察到C-C和C-O偶联产物的形成。根据所提出的机制,使用B3LYP/6-311++G(d,p)方法,以PCM/MeCN为条件,通过量子化学计算对所有反应的能量消耗进行了估算。