High pressure vapour–liquid equilibria of the binary and some of the ternary and multicomponent mixtures of the carbon dioxide+acetic anhydride+α-methylbenzyl alcohol+acetic acid+α-methylbenzyl acetate system

2006 ◽  
Vol 244 (2) ◽  
pp. 179-187 ◽  
Author(s):  
Lourdes Calvo ◽  
Theo W. de Loos
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Acetic Acid ◽  
Acetic Anhydride ◽  
Multicomponent Mixtures

Thiohydantoins. III. Anhydride Intermediates in the Formation of 1-Acyl-2-thiohydantoins from Acylamino Acids

1952 ◽  
Vol 5 (4) ◽  
pp. 728
Author(s):  
JM Swan
Keyword(s):  
Carbon Dioxide ◽  
Acetic Acid ◽  
Acetic Anhydride ◽  
Hippuric Acid ◽  
Ammonium Thiocyanate ◽  
High Yield ◽  
Mixed Anhydride

Linear anhydrides are formed by the action of acetic anhydride on p-toluene-sulphonylglycine and carbobenzyloxy-glycine, -phenylalanine, and -β-alanine. The anhydrides from the first two acids yield the corresponding 2-thiohydantoin with ammonium thiocyanate in acetic acid. Other methods for the preparation of l-p-toluenesulphonylglycine anhydride, and its 2-thiohydantoin, are also given. Hippuric acid, with ethyl chlorocarbonate and triethylamine yields ethyl hippurate, probably via the mixed anhydride and 2-phenyloxazol-5-one. The inclusion of ammonium thiocyanate gives 1-benzoyl-2-thiohydantoin in high yield. The N-carboxy anhydride of phenylalanine (4-benzyloxazolid-2,5-dione) also reacts with ammonium thiocyanate to give carbon dioxide and 5-benzyl-2-thiohydantoin.

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