5-Benzylthiuronium salts

Also known as S-benzylthiuronium salts and as S-benzyl- -thiuronium salts. 

S-Benzylthiuronium salts, I, 168, 171 Bertrands s rule, IV, 226 Betabacterium vermiforme, polysaccharide formation by, II, 219 Betitol, III, 69... 

Cyclopentanophenanthrene, perhydro-3-hydroxy-, glycosides, I, 147 Cymarin, I, 148, 166 Cymaronic acid, phenylhydrazide and S-benzylthiuronium salt, I, 168 Cymaronic lactone, I, 165 Cymaronic lactone (1,4), 5-methyl-, I, 165... 

S-Benzylthiuronium Salt of Diginonic Acid. Thirty-five milligrams of diginonic lactone prepared by bromine oxidation of the sugar is saponified in 3 cc. of 0.1 iV barium hydroxide solution by refluxing for thirty minutes on the steam bath. After cooling, the solution is neutralized with carbon dioxide, boiled for two minutes, filtered, and the filtrate is concentrated to dryness. The residue is taken up in 4 cc. of hot methanol and treated with a hot solution of 48 mg. of /S-benzylthiuronium sulfate in 1 cc. of methanol. After centrifuging from barium sulfate, the clear solution is concentrated to dryness. The residue crystallizes on the addition of acetone. The salt is purified by solution in the minimum amount of hot methanol followed by addition of 3 volumes of hot acetone. If necessary, the hot solution thus obtained is filtered, concentrated and seeded, with addition of more acetone if necessary. The salt crystallizes in rosettes of fine plates and melts at 137-138 after several recrystallizations in the same manner. 

The other [Pg.171]

Sodium borohydride reacts with CgFnSChF in ether and alcohol at 16° to give pcrfluoro-n-octanesulfinate ion, CgFI7S02. The /S-benzylthiuronium salt of this ion melts at 130° (36). 

In a later paper, the same authors further pursue the chemistry of diginose. Diginonic acid was obtained in the form of its crystalline [Pg.169]

The identification of the add or pseudo-acid does not necessarily depend on the isolation of the addic substance, especially if the metal present is sodium or potassium. Thus, the alkali metal salts of carboxylic and sulphonic adds may be characterized by direct conversion into the iS-benzylthiuronium salts, amides or anilides. Carboxylic salts may be also used to prepare the p-nitrobenzyl and p-bromophenacyl esters. Metallic derivatives of phenols may be converted into aryloxyacetic adds. 

Derivatives.. S-Benzylthiuronium salt determination of equivalent weight (both as for carboxylic acids, pages 123, 124). 

General Method of Preparation of S-Benzylthiuronium Salts of Sulfonic Acids... 

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