Esterification of hemins with trimethyloxonium tetrafluoroborate
نویسندگان
چکیده
منابع مشابه
Esterification of hemins with trimethyloxonium tetrafluoroborate.
Esterification of naturally occurring hemins and porphyrins is often a prerequisite for structural studies of these compounds. Porphyrins and hemins are in general more easily purified as their esters than as the free carboxylic acids. In addition, esterification is the most feasible procedure for preparing derivatives of tetrapyrroles for studies by mass spectrometry. The most convenient and f...
متن کاملTriethyloxonium Tetrafluoroborate/1,2-Dimethoxyethane – a Versatile Substitute for Trimethyloxonium Tetrafluoroborate in O-Methylation Reactions
The triethyloxonium tetrafluoroborate/1,2-dimethoxyethane (TEO/DME) mixture is a versatile and cheap substitute for trimethyloxonium tetrafluoroborate in O-methylations of pyrrolin-2-ones, quinolones, acridones, and 1-oxo-β -carbolines. Undesired O-ethylation can be avoided by preincubation of triethyloxonium tetrafluoroborate and 1,2-dimethoxyethane for 1 h, prior to addition of the substrate....
متن کاملHemins of beef heart muscle.
Hemoproteins have an important role in cellular biological oxidation and energy production, and the identification and study of their iron-tetrapyrrole prosthetic groups would appear to be useful in both characterizing and understanding the mechanism of action of these respiratory pigments. Hemoproteins can be divided into those in which the prosthetic groups are tightly bound to the protein mo...
متن کاملThe extraction and paper chromatography of hemins.
The classical procedure for the identification of hemins as prosthetic groups is to isolate the hemins, convert them into porphyrin esters, and identify the esters by their spectra and melting points. This procedure usually requires considerable amounts of material, gives poor yields, and the melting points have not always been definitive (1). Chromatographic methods have aided in establishing ...
متن کاملAn unexpected reaction of 2-alkynylaryldiazonium tetrafluoroborate with sulfur dioxide.
An unexpected result from the reaction of 2-alkynylaryldiazonium tetrafluoroborate with sulfur dioxide is described. In the presence of morpholin-4-amine, this transformation catalyzed by copper(i) bromide proceeds through insertion of sulfur dioxide and intramolecular 5-endo cyclization, leading to benzo[b]thiophene 1,1-dioxides in moderate to good yields.
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ژورنال
عنوان ژورنال: Analytical Biochemistry
سال: 1976
ISSN: 0003-2697
DOI: 10.1016/0003-2697(76)90257-8