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。
Medium-size Cyclophanes, 77.<sup>1</sup> Synthesis and addition of Bromine to <i>syn</i>-[2.<i>n</i>]meta-cyclophan-1-enes
McMurry cyclisation of 1,n-bis(3-formyl-2-methoxyphenyl)alkanes afforded syn-dimethoxy[2.n]metacyclophan-1-enes, in which cis-addition of bromine to the bridged double bond in CH2Cl2 was observed.
Medium-sized cyclophanes. Part 58. Synthesis and conformational studies of [2.n]metacyclophan-1-enes and [n.1]metacyclophanes
作者:Takehiko Yamato、Koji Fujita、Hirohisa Tsuzuki
DOI:10.1039/b010075g
日期:——
rearrangements of [2.n]metacyclophane-1,2-diols afford [n.1]metacyclophanes in good yield. The [2.n]metacyclophan-1-ene-to-[n.1]metacyclophane ratio of the products is strongly governed by the number of the methylene bridges. The proportion of the rearrangement product increases with increasing length of the bridge. Conformational studies of [n.1]metacyclophanes as well as of [2.n]metacyclophan-1-enes in both
一系列syn-和anti- [2。n ]元环phan-1-烯和[2。通过对1,n-双(5-乙酰基-2-甲氧基苯基)烷烃进行McMurry环化,可以高收率制备n ]间环phane-1,2-二醇。有趣的是,在相同的偶合反应中没有吡啶[2。观察到提供[ n .1]甲基环已烷的n ]甲基环己烯基-1,2-二醇,这归因于TiCl 4或环化反应期间由McMurry试剂产生的酸。实际上,质子酸或路易斯酸会导致频哪醇重排[2。n ]元环phane-1,2-二醇可提供高收率的[ n .1] metacyclophanes。[2。Ñ ] metacyclophan -1-烯TO- [ Ñ 0.1]的产品metacyclophane比率强烈地受到的数量支配亚甲基桥梁。重排产物的比例随着桥长度的增加而增加。[ n .1]个亚基和[2.]的构象研究。还描述了溶液和固态的n ] metacyclophan-1-enes。
Yamato, Takehiko; Matsumoto, Jun-ichi; Sato, Mitsuhiro, Journal of the Chemical Society. Perkin transactions I, 1995, # 10, p. 1299 - 1308