Preparation and separation of all possible rotamers of a stereochemical analog of meso -tartaric acid: optically inactive and optically active isomers of ( R , S )-2,2′-bis(methoxycarbonyl)-6,6′-dimethyl-9,9′-bitriptycyl
was opticallyinactive Ci conformation. The other opticalactive forms were resolved to give a pair of enantiomers, which were characterized by optical rotation and CD spectra. Thus the opticalinactivity of a compound such as meso-tartaric acid that can take Ci conformation in solution, is now ascribed to that the molecule has an opticallyinactive Ci conformer and equal amounts of optically active
An efficient reduction of anthrones to anthracenes
作者:Donald J. Marquardt、Frankie A. McCormick
DOI:10.1016/0040-4039(94)88004-2
日期:1994.2
An efficient and general means of reducing anthrones to anthracenes has been developed. The procedure, which uses NaBH4 as the reducing agent in a mixed solvent system of diglyme/methanol, produced anthracenes in essentially quantitative yield from a variety of anthrones.