Deuterium isotope effects for migrating and nonmigrating groups in the solvolysis of neopentyl-type esters
作者:V. J. Shiner、Jimmy J. Tai
DOI:10.1021/ja00392a031
日期:1981.1
-deuterium rate effects on the solvolysis of (1-methylcyclohexyl)methyl, (1-methylcyclopentyl)methyl, and (1-methylcyclobutyl)methyl sulfonate esters have been measured and the solvolysis products examined by /sup 2/H NMR spectroscopy. The results indicate that the products of the solvolysis of all these sulfonate esters are predominantly (greater than or equal to 98%) rearranged. In the solvolysis of (1-m
..cap α..- 和 ..gamma..- 氘速率对(1-甲基环己基)甲基、(1-甲基环戊基)甲基和(1-甲基环丁基)甲基磺酸酯的溶剂分解的影响已被测量,并且溶剂分解通过/sup 2/H NMR光谱检查产物。结果表明,所有这些磺酸酯的溶剂解产物主要(大于或等于 98%)重排。在(1-甲基环己基)甲基三氟甲磺酸酯的溶剂分解中,甲基迁移的重排产物略高于扩环产物。对于甲基-d/sub 3/ 化合物观察到正常同位素效应,在 80E 中为 1.057,在 97T 中为 1.073,并且在 80E 中观察到亚甲基-d/sub 4/ 化合物的反向效应为 0.963。然而,在(1-甲基环戊基)甲基和(1-甲基环丁基)甲基磺酸盐的溶剂分解中,主要产品为扩环产品。在这些例子中,对甲基-d/sub 3/-标记的物种观察到了相反的影响。在(1-甲基环己基)甲基的溶剂分解中,观察到的同位素效应可以分为0.927、0