Intramolecular Hydrogen Bonding and Conformations of α,α-Dialkyl-and α-Alkyl-<i>o</i>-methoxybenzyl Alcohols
作者:Akihiko Yamashita、Katsuo Hara、Shigeko Aizawa、Minoru Hirota
DOI:10.1246/bcsj.47.2508
日期:1974.10
The stable conformations of α-alkyl- and α,α-dialkyl-o-methoxybenzyl alcohols were deduced by measurement of their infrared and PMR spectra. Population of these conformations was estimated from the intensities of the O–H stretching bands of the free and the hydrogen-bonded species. The O–H chemical shifts at infinite dilution (δOH∞) of the free and the hydrogen-bonded species were determined by plotting the δOH∞ values against population obtained from the infrared spectra. An anomalous behavior was observed with the α-alkyl-α-t-butyl alcohols, which might be due to a buttressing effect.
通过测量红外光谱和质子磁共振光谱,推导了α-烷基-和α,α-二烷基-邻甲氧基苄醇的稳定构象。这些构象的占据情况是通过自由物种和氢键物种的O-H伸缩带的强度来估计的。通过将自由物种和氢键物种的O-H化学位移(δOH∞)值与从红外光谱获得的占据情况作图,确定了它们的δOH∞。观察到了α-烷基-α-叔丁醇的异常行为,这可能是由于支撑效应导致的。