منابع مشابه
SYNTHESIS OF a-AMINO-p-HYDROXY-n-BUTYRIC ACIDS VII. AN IMPROVED SYNTHESIS OF DL-ALLOTHREONINE
Several methods are available for the synthesis of DL-threonine (l-3). However, each of these involves the separation of threonine from a mixture containing varying proportions of the isomeric allothreonine. Recently it has been reported that derivatives of rm-allothreonine may be converted to DL-threonine in excellent yields (3-5). These developments make the preparation of nn-allothreonine of...
متن کاملImproved Synthesis of Vasicinone
A new, high yielding method for the preparation of vasicinone (7) is described. Reaction of 2-nitrobenzoic acid with N, N¢-carbonyldiimidazole followed by 2-pyrrolidinone gave 1-(2-nitrobenzoyl)pyrrolidine-2-one (3). Reduction of the latter with 10% Pd-C afforded deoxyvasicinone (4). Reaction of deoxyvasicinone (4) with bromine yielded monobromo-deoxyvasicinone (5). Exchange of bro...
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چکیده ندارد.
An improved synthesis of octaethylporphyrin.
Octaethylporphyrin (OEP, 1) is, by reason of its symmetry, high solubility, and stability, one of the more important and widely used models for the study of porphyrin chemistry. In the past, its synthesis has been tedious and erratic, particularly whenever more than a few grams were required. The usual syntheses, those of Inoffen et al. l and of Whitlock and Hanauer2 (based on earlier work of E...
متن کاملAn Improved Synthesis of Homocitrate
Monoethyl malonate (1) and tert-butyl alcohol are esterified by catalysis with dicyclohexylcarbodiimide and 4-dimethylaminopyridine to yield ethyl t-butyl malonate (2). The ethoxymagnesio derivative (3) of the ester is condensed with β-carbomethoxypropionyl chloride to give the triester (4), which is decomposed by heating under vacuum in the presence of β-naphthalensulfonic acid to give ethyl m...
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ژورنال
عنوان ژورنال: Agricultural and Biological Chemistry
سال: 1974
ISSN: 0002-1369,1881-1280
DOI: 10.1271/bbb1961.38.1097