On the Most Powerful Chemical Traps for Bis(methoxycarbonyl)carbene (=2-Methoxy-1-(methoxycarbonyl)-2-oxoethylidene)
作者:Vladimir V. Shevchenko、Natalya G. Zhegalova、Andey O. Borzenko、Valerij A. Nikolaev
DOI:10.1002/hlca.200890054
日期:2008.3
validity of different chemical substrates for trapping bis(methoxycarbonyl)carbene (=2-methoxy-1-(methoxycarbonyl)-2-oxoethylidene; 1) is dependent on the conditions of carbene generation. On conventional photolysis of dimethyldiazomalonate (=2-diazopropanedioic acid dimethyl ester; 2) by long-wave UV light (through a Pyrex filter, λ>290 nm), the most powerful trap for carbene 1 in the series of substrates
捕获双(甲氧基羰基)卡宾(= 2-甲氧基-1-(甲氧基羰基)-2-氧代亚乙基; 1)的不同化学底物的效率和有效性取决于卡宾的生成条件。在传统的长波紫外光(通过Pyrex滤光片,λ > 290 nm)对重氮二甲酸二甲酯(= 2-重氮丙二酸二甲酯;2)进行光解时,在一系列基质Me 2 S中,卡宾1的捕集能力最强,甲醇,环己烷,和吡啶是Me 2 S(与的效率比约6:4:2:1,RESP)。重氮丙二酸酯2的短波分解使用双酚(甲氧基羰基)卡宾(1)通过石英滤光片(λ > 210 nm),更可靠和有用的化学捕集阱是吡啶和环己烷,它们与1的加合物在短波照射条件下相当稳定。当需要同时监测光解过程中卡宾和氧杂环丁烯的形成时,优选将醇用于捕集1。