Synthesis and conformation of some 2,4-dioxa- and 2,4-dioxa-3-silabicyclo[3.3.1]nonanes
作者:J.A. Peters、P.E.J. Peters-Van Cranenburgh、W.M.M.J. Bovée、H.P. Rozema、J.M. van der Toorn、Th.M. Wortel、H. van Bekkum
DOI:10.1016/0040-4020(82)80072-0
日期:1982.1
The conformation of the title compounds established by 13C and 1H NMR spectroscopy shows that replacement of the 2- and 4-methylene groups in bicyclo[3.3.1]nonane by ether oxygen atoms strongly destablizes the cc conformation: in 2-oxabicyclo[3.3.1]-nonane the cc and the bc conformers are about equally populated, whereas in 2,4-dioxabicyclo[3.3.1]nonane the bc conformation predominates. The 2,4-dioxa-3-silabicyclo[3
通过13 C和1 H NMR光谱确定的标题化合物的构象表明,双环[3.3.1]壬烷中的2-和4-亚甲基被醚氧原子取代会严重破坏cc的构象:在2-oxabicyclocyclo [ 3.3.1]-壬烷的cc和bc构象异构体大约相等,而在2,4-二恶双环[3.3.1]壬烷中,bc的构象占优势。的2,4-二氧杂-3- silabicyclo [3.3.1]壬烷还主要发生在矿井BC构象。与碳环双环[3.3.1]壬烷一样,两翼都被强烈展平。描述了立体选择性合成的3α-甲基双环[3.3.1]壬烷,这项研究中的重要模型化合物。