| 摘要 |
<p>Cpds of formula: (where X is O, S, or NR2; Y is O, S or NR4; R1,R2,R3 and R4 are H, opt. substd aliphatic or aromatic gps or opt. substd 5- to 7-membered heterocyclic rings, at least either X and Y or R1 and R3 being different) may be prepd by reacting perfluoro-2,5-diazahexa-2,4-diene with ca 1 mole of R1XH in the presence of >=1 acid eqiv. of an HF-acceptor, pref. an alkali metal fluoride (esp. NaF) at -100 to 80 degrees C, and then reacting the product with ca 1 mole of R3YH in the presence of >=1 mole of HF-acceptor, pref an alkali metal fluoride or a tert amine (or esp. excess of R3YH when this is an amine) at -100 to 80 degrees C.</p> |
