[reaction: see text] A concise, four-step conversion of 2-methylcyclopentenone to hydroazulene 2 is described. An alternative approach that led to an unexpected [5,5]-bicyclic carbon framework is also discussed.
[反应:见正文]描述了将2-甲基
环戊烯酮简略地四步转化为氢化azulene 2的方法。还讨论了导致意外的[5,5]双环碳骨架的替代方法。