Preparation and Conformational Analysis of 6,10-Diethyl[1,2,3]trithiolo- [4,5-<i>h</i>]benzopentathiepin Monoxides: Isolation and Optical Properties of Chiral Benzopentathiepin Derivatives
作者:Takeshi Kimura、Masayuki Hanzawa、Kazuhiko Tsujimura、Tatsuya Takahashi、Yasushi Kawai、Ernst Horn、Takayoshi Fujii、Satoshi Ogawa、Ryu Sato
DOI:10.1246/bcsj.75.817
日期:2002.4
3 are isomers with respect to the conformation of the 1,2,3,4,5-pentathiepin ring, and 4 and 5 are also the conformational isomers. These compound pair members, 2 and 3, and 4 and 5, were found to isomerize each other by inversion of the pentathiepin ring. The activation parameters of the isomerization, ΔG298≠, ΔH≠, and ΔS≠, were determined by 1H NMR spectroscopy. Because of the slow inversion of the
6,10-二乙基 [1,2,3] 三硫醇 [4,5-h] 苯并五硫菌素 (1) 在二氯甲烷中被 mCPBA 氧化,生成相应的四种一氧化物。一氧化物 2、3、4 和 5 的结构通过 X 射线晶体学确定为 6,10-二乙基 [1,2,3] 三硫醇 [4,5-h] 苯并五硫杂 8-氧化物 (1,2 ,3-trithiole 2-oxides) 用于 2 和 3,和 6,10-diethyl[1,2,3]trithiolo[4,5-h]benzopentathiepin 7-oxides(1,2,3-trithiole 1-oxides)分别为 4 和 5。化合物2和3是1,2,3,4,5-五硫杂环的构象异构体,4和5也是构象异构体。发现这些化合物对成员 2 和 3 以及 4 和 5 通过五硫杂环戊二烯环的反转而彼此异构化。异构化的活化参数ΔG298≠、ΔH≠和ΔS≠由1H NMR光谱测定。由于pentathiepin