منابع مشابه
Pechmann reaction promoted by boron trifluoride dihydrate.
The Pechmann reaction of substituted phenols 1a-e with methyl acetoacetate (2) can be activated by boron trifluoride dihydrate (3) to give the corresponding 4-methyl- coumarin derivatives 4a-e in excellent yield (98-99 %).
متن کاملBoron trifluoride-methanol complex as a non-depurinating detritylating agent in DNA synthesis.
We have found that boron trifluoride-methanol complex (BTMC) is an effective non-depurinating detritylating agent in automated DNA synthesis. Dichloroacetic acid (DCA) is at present widely used for the deprotection of the 5'-hydroxyl group prior to coupling the next nucleotide (1); however, the protected purine bases, 6'-isobutyryl-2'-deoxyguanosine and 4'-benzoyl-2'-deoxyadenosine, are unstabl...
متن کاملThe Heat of Formation of Boron Trifluoride by Direct Combination of the Elements
An accurate value for the heat of formation of boron trifluoride is of significant importance because this value is involved in the thermochemistry of many boron compounds. The study of the thermochemistry of boron compounds was for a long time hampered by difficulties in measuring a suitable reaction involving elemental boron. The heat of formation of boric oxide, for instance, was uncertain t...
متن کاملCyclic Boron Derivatives of Biurets [1]
Several l,3,5-triaza-2-boracyclohexa-4,6-diones have been prepared by condensation reactions of boranes with biurets; N-methylated species could be characterized by their 1H, U B and 13C NMR spectra. Some data are also reported on bicyclic bis(N,N',N"trimethylbiuret-l,5-diyl)borate(l-) salts and on a betaine consisting of two N,N',N"-trimethylbiuret moieties bonded to a central four-coordinate ...
متن کاملPolyVinylPolyPyrrolidone-Supported Boron Trifluoride (PVPP-BF3); Highly Efficient Catalyst for Oxidation of Aldehydes to Carboxylic Acids and Esters by H2O2
A highly efficient method for the oxidation of aldehydes to carboxylic acids using PolyVinylPolyPyrrolidone supported - Boron Trifluoride (PVPP-BF3) in the presence of 35% hydrogen peroxide has been developed in acetonitrile at 60 °C. This procedure cleanly oxidizes variety of aldehydes to the corresponding carboxylic acids. Oxidative esterification of benzaldeh...
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ژورنال
عنوان ژورنال: Journal of Chemical Education
سال: 1951
ISSN: 0021-9584,1938-1328
DOI: 10.1021/ed028p56