Five-membered zircona- and titanacycloallenes; their diverse reactivity depending upon the position of substituents
作者:Noriyuki Suzuki、Rikako Kurita、Akiko Kawamura、Tomoyuki Ono、Yoshiro Masuyama
DOI:10.1016/j.jorganchem.2018.08.010
日期:2018.11
Five-membered metallacycloallene compounds that are 2,5-disubstituted 1-zirconacyclopenta-2,3-dienes were prepared from (E)-1,4-bis(trialkylsilyl)but-1-en-3-ynes in good yields. The structures of these compounds were determined by X-ray diffraction study. Contrary to our previous study on 2,4-disubstituted 1-zirconacyclopenta-2,3-dienes, which gave alkynyl alcohols by the reaction with ketones after
由(E)-1,4-双(三烷基甲硅烷基)but-1-en-3-ynes以良好的收率制备了2,5-二取代的1-氧化锆环戊基-2,3-二烯的五元金属杂环化合物。这些化合物的结构通过X射线衍射研究确定。与我们之前对2,4-二取代的1-zrconacyclopenta-2,3-二烯的研究相反,后者在水解后与酮反应生成炔醇,而2,5-双(三烷基甲硅烷基)配合物与酮反应生成烯丙醇。与腈的反应可能通过形成七元的1-氮杂-2-氧化锆环庚-3、4、7-三烯环结构而生成吡咯化合物。用异丙醇钛/ n处理(E)-1,4-双(三烷基甲硅烷基)but-1-en-3-ynes丁基锂,然后与腈反应,得到相应的炔基酮。