N-Butyric anhydride

V,7V,7V, 7V -Tetramethylethylenediamine (TMEDA, TEMED) [110-18-9] M 116.2, b 122°, d 1.175, n 1.4153, pK 5.90, pKj 9.14. Partially dried with molecular sieves (Linde type 4A), and distd in vacuum from butyl lithium. This treatment removes all traces of primary and secondary amines and water. [Hay, McCabe and Robb J Chem Soc, Faraday Trans 1 68 1 1972.] Or, dried with KOH pellets. Refluxed for 2h with one-sixth its weight of n-butyric anhydride (to remove primary and secondary amines) and fractionally distd. Refluxed with fresh KOH, and distd under nitrogen. [Cram and Wilson 7 Am C/iem Soc 85 1245 796i.] Also distd from sodium. 

System (3) described the use of stable-isotope-dilution mass spectrometry for the simultaneous determination of cortisol, cortisone, prednisolone, and prednisone in plasma [177]. Cortisol, cortisone, prednisolone, and prednisone were simultaneously extracted from acidified plasma on a Sep-Pak Ci8 cartridge. The column was eluted with methanol, the eluent evaporated, and the residue compounds reacted to their bismethylenedioxy-3-heptafluoro-n-butyryl derivatives by treatment with formaldehyde and heptafluoro-n-butyric anhydride. The derivatives were... 

According to the submitters, equally good yields can be obtained in the preparation of propionic anhydride and n-butyric anhydride. 

Butyl peroxylri methyl acetate, see Butyl peroxypivalate Butyl vinyl ether n-Butyraldehyde iso-Butyraldehyde n-Butyric acid iso-Butyric acid n-Butyric anhydride 2-Butyrolactone n-Butyronitrile Butyryl chloride Camphor Caproic acid... 

SYNS ANHYDRID KYSELINY MASELNE BUTANOIC ACID, ANHYDRIDE (9CI) BUTANOIC ANHYDRIDE BUTYRANHYDRID BUTYRIC ACID ANHYDRIDE n-BUTYRIC ACID ANHYDRIDE n-BUTYRIC ANHYDRIDE BUTYRYL OXIDE... 

The best results are obtained with a fractionating column surrounded by an electrically-heated jacket (compare Figs. 11, 17, 2, and 11, 17, 3), but this is not essential for n-caproic anhydride. For the preparation of propionic or n-butyric anhydride, a highly efficient fractionating column must be used in order to obtain satisfactory results. 

Eastman n-Butyric Acid, Eastman n-Butyric Acid, Kosher. See n-Butyric acid Eastman n-Butyric Anhydride. See Butyric anhydride... 

Fluorosulfonic acid added drop wise with cooling and stirring at ca. —5° to n-butyric anhydride, and warmed slowly to room temp, under reduced pressure n-butyryl fluoride. Y ca. 95%. F. e., also carboxylic acid chlorides with chlorosulfonic acid, s. M. Schmidt and K. E. Pichl, B. 98, 1003 (1965). ... 

Reports have appeared which describe studies on interactions between perfluoroalkanecarboxylic acid anhydrides and Lewis bases as revealed by low-temperature thermographic analyses, on the preparation from hepta-fluoro-n-butyric anhydride, properties, and use in g.l.c. analysis of steroid heptafluorobutyrates and enol heptafluorobutyrates, and on the pyrolytic... 

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