Dl-cysteine derivs and inactive cystine

derivs. and inactive cystine Crude alpha-amino-beta-ethoxypropionic acid (obtained e.g. by reaction of alpha-bromo-beta-ethoxypropionic acid with NH3) is reacted in the presence of acetic anhydride with a thio-acid or thiourea, then hydrolysed with acid or alkali and oxidized (e.g. with H2O2 or air)...

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Bibliographische Detailangaben
Hauptverfasser:	PAUL RAMBACHER,.DR.(ER.NAT.), MAEKE,SIEGFRIED
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	BLASTING CHEMISTRY COLD ROOMS COMBINED HEATING AND REFRIGERATION SYSTEMS CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, ORTHE LIKE COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHERSUBCLASS FIXED CONSTRUCTIONS HEAT PUMP SYSTEMS HEATING HETEROCYCLIC COMPOUNDS ICE-BOXES LIGHTING LIQUEFACTION SOLIDIFICATION OF GASES MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR MANUFACTURE OR STORAGE OF ICE MECHANICAL ENGINEERING METALLURGY ORGANIC CHEMISTRY REFRIGERATION OR COOLING REFRIGERATORS WEAPONS
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Beschreibung
Zusammenfassung:	derivs. and inactive cystine Crude alpha-amino-beta-ethoxypropionic acid (obtained e.g. by reaction of alpha-bromo-beta-ethoxypropionic acid with NH3) is reacted in the presence of acetic anhydride with a thio-acid or thiourea, then hydrolysed with acid or alkali and oxidized (e.g. with H2O2 or air) to give inactive cystine. Alternatively, the hydrolysis product (D, L-cysteine) may be reacted with dicyandiamide to give DL-2-guanidino-2-thiazoline-4-carboxylic acid or benzylated and/or acetylated to give benzylcysteine, acetylcysteine or benzylacetylcysteine.