1,2-二(对-甲苯基)-1,2-二甲基二硅桥连二环戊二烯基四羰基二铁的合成及热重排反应  被引量:4

Synthesis and Thermal Rearrangement of 1,2-Di(p-tolyl)-1,2-dimethyldisilanylene Bridged Bis(cyclopentadienyl) tetracarbonyldiiron

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作  者:孙怀林[1] 张会利[1] 马玉新[1] 

机构地区:[1]南开大学化学系,天津300071

出  处:《高等学校化学学报》2006年第11期2097-2100,共4页Chemical Journal of Chinese Universities

基  金:国家自然科学基金(批准号:29872020;20372036);教育部留学回国人员科研启动基金(批准号:03406);天津市科技发展计划项目(批准号:05YFJMJC06800)资助

摘  要:C l2M eS iS iM eC l2与环戊二烯基锂及对甲苯基溴化镁反应,生成C5H5(p-Tol)M eS iS iM e(p-Tol)C5H5.后者再与五羰基铁反应,得到标题化合物[η5,η5-C5H4(p-Tol)M eS iS iM e(p-Tol)C5H4]Fe2(CO)2(μ-CO)2(3);同时还得到两个单硅桥连副产物[η5,η5-(p-Tol)2M eS iS iM e(C5H4)2]Fe2(CO)2(μ-CO)2(4)和[η5,η5-(p-Tol)M e2S iS iM e(C5H4)2]Fe2(CO)2(μ-CO)2(5).化合物3中顺式异构体(3a)占绝对优势,可通过简单重结晶分离出纯品.化合物3a在加热条件下发生分子内的硅硅键和铁铁键之间的复分解重排反应,生成[η5-(p-Tol)M eS iC5H4Fe(CO)2]2(6).该产物为顺反异构体的混合物(顺反异构体的摩尔比为4∶3),表明重排反应不涉及协同历程.利用X射线衍射法测定了化合物4的分子结构.Cl2MeSiSiMeCl2 (1) reacted with C5H5Li and subsequently with p-tolylmagnesium bromide to afford C5H5 (p-Tol) MeSiSiMe (p-Tol) C5H5 (2). The latter further reacted with Fe (CO) 5 gave the title complex [ η^5, η^5-C5H4 (p-Tol) MeSiSiMe (p-Tol) C5H4 ] Fe2 ( CO )2 (μ-CO)2 ( 3 ). Meanwhile, two mono-silicon bridged by-products [ η^5, η^5- (p-Tol)2 MeSiSiMe ( C5H4 )2 ] Fe2 ( CO )2 (μ-CO )2 ( 4 ) and [ η^5, η^5- (p-Tol) Me2SiSiMe · ( C5H4 )2 ] Fe2 ( CO)2 (μ-CO)2 (5) were also obtained. Product 3 contains predominantly the c/s isomer (3a), which was isolated in pure form by simple recrystallization. Compound 3a underwent the metathesis rearrange- ment reaction between Si-Si and Fe-Fe bonds under thermal conditions giving complex [ η^5- (p-Tol) MeSiC5H4Fe (CO) 2 ] 2 (6). This product was a mixture of c/s and trans isomers with a molar ratio about 4: 3, demonstrating that the reaction does not involve a concerted process. The molecular structure of compound

关 键 词:热重排 硅硅键 环戊二烯基 复分解 

分 类 号:O626[理学—有机化学]

 

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