摘要 |
<p>The compound (S)(+)-4,4'-(1-methyl-1,2-ethanediyl)-bis(2,6-piperazinedione) is prepared by treating propylenediamine tetraacetic tetraamide in a dipolar aprotic solvent with an alkali metal derivative of dimethyl sulfoxide to form a dialkali metal salt of (S)(+)-4,4'-(1-methyl-1,2-ethanediyl)-bis(2,6-piperazinedione); and neutralizing the dialkali metal salt.</p> |