| 摘要 |
<p>Diaminodiphenyl-compounds of the structure selected from: <CHEM> or <CHEM> wherein R1 and R2 can be: H, -CH3, -C2H5, -C3H7, -C4H9 or <CHEM> Y can be: C(CH3)2, <CHEM> n=0; 1. are purified by distilling the crude product obtained under vacuum in one step, in the presence of one or more alkaline bases.</p> |
