[2.1.1]Orthocyclophanes 2 are prepared by pyrolysis of the corresponding 2-thia[3.1.1]orthocyclophane 2,2-dioxides 9, which are prepared by the reaction of 1,2-bis(2-bromomethylbenzyl)benzenes 7 with Na2S in ethanol under high dilution conditions, followed by oxidation with m-chloroperbenzoic acid. The conformationalstudies on [2.1.1]orthocyclophanes 2, which adopt flexible saddle and crown structures
[2.1.1]通过将相应的2-硫杂[3.1.1]原环烷2,2-二氧化物9热解来制备原环烷 2,后者是通过1,2-双(2-溴甲基苄基)苯7与2,2-二(2-溴甲基苄基)苯的反应制备的。的Na 2 S IN乙醇高度稀释的条件下,随后用氧化下米氯过苯甲酸。与相应的10,15-dihydro-5 H -tribenzo [ a,d,g ]环壬烯([1.1.1] Orthocyclophane)相比,[2.1.1] Orthocyclophanes 2的构象研究 采用柔性的鞍形和冠状结构讨论图1。