Phenylacetaldehyde and its cis- and trans-enols and enolate ions. Determination of the cis : trans ratio under equilibrium and kinetic control
作者:Y. Chiang、A. J. Kresge、P. A. Walsh、Y. Yin
DOI:10.1039/c39890000869
日期:——
method of determining individual keto–enol equilibrium and acid dissociation constants for systems in which unstable enols can exist in cis and trans isomeric forms is developed and is applied to phenylacetaldehyde in aqueous solution; the results give equilibrium cis : trans ratios of 35 : 65 in acidic and neutral solutions and 20 : 80 in a basic solution (where the enols are converted to enolate ions)
开发了一种测定系统中各个酮-烯醇平衡和酸解离常数的方法,其中不稳定的烯醇可以顺式和反式异构体形式存在,并应用于水溶液中的苯乙醛。结果表明,在酸性和中性溶液中,顺式:反式的平衡比为35:65,在碱性溶液中(烯醇被转化为烯醇酸根离子)的比例为20:80,但是在动力学条件下形成的烯醇的顺式:反式分化明显减少控制。