3,5-bis(ferrocenylmethylene)-1-methyl-4-methylenepiperidine. Synthesis and some chemical propertiesстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:3,5-Bis(ferrocenylmethylene)-1-methyl-4-methylenepiperdine, a diferrocenyltriene with a fixed s-cisoid conformation of the exocyclic double bonds, was synthesized. On heating, this compound cyclodimerizes according to the [4+2]-cycloaddition scheme; it forms Diels-Alder adducts with azodicarboxylic and maleic acid N-phenylimides. The compound easily cyclodimerizes in the presence of acids by a proton cyclodimerization mechanism to give a spiro cyclodimer. The triene also adds a 3,5-bis(ferrocenylmethylene)-1,4-dimethyl-1-azonia-4-cyclohexyl salt to the terminal methylene group yielding linear and cyclic addition products.