Eine neue umlagerung eines cycloocta[d]pyridazins zum barreleno[d]pyridazin
摘要:
Reaction of 1,2,4,5-tetrazine 1 with cyclooctatetraene 2 leads to cycloocta[d]-pyridazine 4 in high yield. 4, on heating in toluene, quantitatively rearranges to barreleno[d]pyridazines 8 and 9, respectively.