are strongly regulated by the number of methylene bridges present. The percentages of the rearrangement products increase with increasing length of the carbon bridges. Characterization and the conformational studies of these products are described. Single crystal X-ray analysis revealed the adoption of syn- and anti-conformations. DFT calculations were carried out to estimate the energy-minimized structures
一系列syn-和anti- [2。通过对1,n-双(5-叔丁基-3-甲酰基-2-
甲氧基苯基)
烷烃进行McMurry环化,已经以高收率制备了n ]环环-1-烯。值得注意的是,酸催化重排[2。n ]元环phan-1-enes以良好的收率提供了[ n .1]元环phanes。产物的比例受存在的亚甲基桥的数目的强烈调节。重排产物的百分比随着碳桥长度的增加而增加。描述了这些产品的表征和构象研究。单晶X射线分析表明采用了syn-和反构象。进行了DFT计算以估计合成的亚甲基环烷的能量最小化结构。