Action of Strong Acids on Acetylated Glucosides. III. Strong Acids and Aliphatic Glucoside Tetraacetates in Acetic Anhydride-Acetic Acid Solutions.

The Action on Tyrosine and on Phxnylamino- Acetic Acid of Acetic Anhydride and Acetone in the Presence of Pyridine

There are recorded in literature several instances in which the acylation of amino acids in the presence of pyridine proceeded abnormally. ’ We have encountered an unexpected reaction in attempting to acetylate I-tyrosine suspended in. a solution of pyridine in commercial acetic anhydride (containing 90 to 95 per cent of the pure anhydride). From the reaction product a orystalline substance, CM...

Acid precipitation: strong and weak acids.

The Racemization of Amino Acids in Aqueous Solution by Acetic Anhydride

In a previous investigation du Vigneaud and Sealock (1) have reported that the sodium salt of acetyl-l-tryptophane in aqueous solution at 35-40” is completely racemized by acetic anhydride within a few hours. The ease of racemization and particularly the mild conditions under which the reaction occurred seemed to us to offer an excellent method for racemizing amino acids if the reaction should ...

Oxidative reaction of oxindole-3-acetic acids.

The oxindole-3-acetic acids, oxidative metabolites of indole-3-acetic acid, were isolated from a byproduct of a corn starch manufacturing plant, and were further converted to the 3-hydroxyl derivatives in the presence of metal ion. The mechanical study was followed by a chemical analysis including other byproducts, and suggested the presence of an intermediate that had a radical at the C-3 posi...

Inhibition of biohydrogen production by undissociated acetic and butyric acids.

Glucose fermentation to hydrogen results in the production of acetic and butyric acids. The inhibitory effect of these acids on hydrogen yield was examined by either adding these acids into the feed of continuous flow reactors (external acids), or by increasing glucose concentrations to increase the concentrations of acids produced by the bacteria (self-produced). Acids added to the feed at a c...