S-Alkylthiuronium halides

Alkylene bromide, 20, 24 Alkylene thioureas, 26, 35 Alkylidenecyanoacetic esters, 25, 48 Alkyl lactate, 26, 6 Alkyl phenyl selenides, 24, 91 S-Alkylthiuronium halides, 22, 60 d/-ALLOTHREONINE, 20, 104 Alloxan, 23, 3... 

Addition tube, 20, 21 Alanine, /3-(3,4-dihydroxyphenyl)-N-METHYL-, 22, 89, 91 Alcoholic hydrochloric acid, 22, 77, 83 standardization, 22, 80 Alcoholysis, 20, 67 Aldehyde synthesis, 20, 14 from acid chlorides by Rosenmund reaction, 21, 84, 87, 88, 110 Alkylation of thiourea, 22, 59 Alkylchlororesorcinols, 20, 59 Alkylene bromide, 20, 24 S-Alkylthiuronium halides, 22, 60 dl-ALLOTHREONINE, 20, 10 ... 

S-Alkylthiuronium halides are soluble in the reaction medium and are therefore converted to insoluble picrates or 3,5-dinitrobenzoates. While aqueous or alcoholic picric acid solutions are used for the preparation of picrates, 3,5-dinitrobenzoates are precipitated with 3% aqueous sodium 3,5-dinitrobenzoate (7). 

In principle, alkyl halides can be chromatographed in two ways. Monoalkyl halides, with alkyls from Cj to C5, can be converted to corresponding S-alkylthiuronium salts and chromatographed in w-amyl alcohol-acetic acid-water (26). 

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