申请人:Jaeger Jurgen
公开号:US20080015354A1
公开(公告)日:2008-01-17
The invention concerns a novel process for the preparation of 2H-chromenes of formula I and formula 5 and valuable intermediates of formulae 3 and 4 of this process.
本发明涉及一种新的制备式I和式5的2H-
香豆素以及该过程的式3和式4的有价值中间体的方法。