dl-3.5.3′.5′-Tetramethyl-thyronin (II) wird, ausgehend von 2.6-Dimethylanilin, in 10 Stufen mit einer Gesamtausbeute von 5% d. Th. dargestellt. Seine Eigenschaften werden mit denen von dl-Thyronin, dl-Thyroxin, dl-3.5.3′.5′-Tetranitro-thyronin und entsprechend substituierten Thio-thyroninen verglichen

The present paper deals with new cotton dyes, approaching the subject from two directions.In the first section the synthesis of a new type of reactive dye from products of Reppe acetylene chemistry is reported. The second part describes a dyeing process which does not start with reactive dyes. Instead, the homopolar bonding between dye and cotton is formed by linking the dye to the substrate via polyfunctional bridges. These two programs have led to the development of the @Primazin P and @Basazol dyes.In his review of the century which had passed since the discovery of the first synthetic dye, Zollinger [l] referred to the reactive dyes as "the most important technical discovery of the Iast two decades in the field of dye chemistry". After decades of dyeing cotton with vat dyes and direct dyes, reactive dyes now presented the possibility of using brilliant dyes with relatively simple structures. Stimulated by this new development, fashion turned to brighter hues. The problems solved by the dye manufacturers in this connection are reflected in the many types of reactive dyes which have since been produced.

Covalent bonds can be established under alkaline conditions between cellulose and dyes containing nucleophilic groups by employing cross–linking agents which are able to provide several positively charged carbon atoms. Examples are given of various cross–linking agents and dyes. The reaction gives a high colour yield and is the basis for the new Basazol (BASF) range of dyes. These dyes give strong prints on cotton and regenerated cellulose fibres, and possess good fastness properties.

Aliphatische und aromatische Disulfide werden in wäßrig-oder alkoholisch-alkalischer Lösung mit Alkaliarsenit reduzierend zu Thiolen gespalten. Diese setzen sich beim Ansäuern mit überschüssiger Arsen (III)-Verbindung zu gut kristallisierenden Arsen-trimercaptiden, As (SR)3, um, die sich wie „stabilisierter Formen” der freien Thiole verhalten. Aus den Trithioarseniten erhält man die Mercaptoverbindungen durch Hydrolyse mit Salzsäure-Eisessig in Gegenwart von Schwefelwasserstoff zurück. Die Beziehungen zwischen Arsen-mercaptiden, Disulfiden und freien Thiolen werden am Beispiel des 2.6-Dinitro-4-mercapto-phenols und seiner Methyläther genauer abgehandelt. Arsen-tris-phenylmercaptid hemmt das Wachstum von Staphylococcus aureus, Escherichia coli und Saccharomyces carlsbergensis total in einer Konzentration von 1.7–6.8·10−5 g/ccm

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