Tetraarylbiladien-ab-ones bearing various substituents (R) in the para position of the phenyl groups were preprared by coupled oxidation of tetraarylporphyrin iron complexes. The yields of 5,10,15-triaryl-19-aroyl-15-hydroxybiladien-ab-ones were 74% (R = H), 85% (R = OMe), 44% (R = COOMe), and 28% (R = CN). Kinetic studies of the iron porphyrin oxidation revealed that the reaction is accelerated by
Tetraarylbiladien- AB -
酮类轴承在苯基基团的对位上各种取代基(R)通过tetraarylporphyrin
铁络合物的耦合氧化preprared。的5,10,15-三芳基- 19芳酰基-15- hydroxybiladien-收率AB -酮分别为74%(R = H),85%(R = OME),44%(R = COOMe),和28% (R = CN)。
卟啉铁氧化的动力学研究表明,该反应由具有Hammett反应常数ρ= 0.295的吸电子取代基加速。5,10,15-三芳基19芳酰基-15- hydroxybiladien- AB -酮要么经历酸催化的消除反应通
过乙酸或由介孔
二氧化硅,得到5,10,15-三芳基- 19-aroylbilatrien- ABC-一。在
乙酸中的消除反应被具有哈米特反应常数ρ= -1.48的给电子取代基所加速。