【摘 要】
：
There is a classic experiential rule about 1,2-diol RCR1 (OH) CR1 (OH) R ( R1 = H or methyl), that is,the proton chemical shift of the α-R1 group at the hydrox
【机 构】
：
College of Chemistry,Department of Medicinal Pharmacology,College of Life Sciences
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There is a classic experiential rule about 1,2-diol RCR1 (OH) CR1 (OH) R ( R1 = H or methyl), that is,the proton chemical shift of the α-R1 group at the hydroxyl group in the dl-isomer, in general, appears in a higher field with ca. Δ = 0. 1-0. 2 than the one in the meso-isomer[1] For example, in CDCl3 the α-H of the dl-1,2-diphenylethanediol has a signal of 1H NMR at δ = 4. 62, while the meso-isomer shows a signal of 1H NMR at δ = 4. 84[2]. This experiential rule was used in almost all the 1,2-diol coupling reactions to determine the ratio of dl to meso of the diols[1, 3-6].
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