| 摘要 |
<p>1509323 Piperazinedione derivative DEUTSCHE GOLD-UND SILBER-SCHEIDEANSTALT 22 May 1975 [26 June 1974] 22184/75 Heading C2C 3,6 - Bis(2 - methylinercaptoethyl) - 2,5- piperazinedione is prepared by reacting 5-(2- methylinercaptoethyl) - hydrantoin under elevated pressure in the presence of water at 100-200‹ C. Ammonia and/or methionine is preferably present. Mother liquor after separation of the dione may be recycled. The hydrantion may be contained in a reaction mixture from 3 - methylinercaptopropionaldehyde, HCN, NH 3 and CO 2 .</p> |
