Thermal ring enlargement of aromatic cyclopentadienylidene iminyl radicals. Intramolecular radical addition to the N atom of nitriles results in high yields of aza-aromatics
作者:Jörg Hofmann、Kathrin Schulz、Gerhard Zimmermann
DOI:10.1016/0040-4039(96)00320-6
日期:1996.4
benz-anellated cyclopentadienones (fluorenone (9a), methanophenanthrenone (9b)), yield into phenanthridine (8a) and benzo[lmn]-phenanthridine (8b) in yields > 60%. The results point to a predominant addition of intermediately generated phenyl type radicals 5 to the N atom of the nitrile groups followed by bimolecular H-abstraction of the cyclic imidoyl radicals to 8 (scheme 3).
业已证明,在高温(1000°C,0.3 s)下,无氧氮中的苯甲酰基基团由苯甲酰化的环戊二烯酮(芴酮(9a),美甲菲蒽酮(9b))的苯hydr生成,生成菲啶(8a)。和苯并[lmn]-菲啶(8b),产率> 60%。结果表明,主要将中间生成的苯基型自由基5加到腈基的N原子上,然后将环状亚氨基自由基的双分子H-抽象成8(方案3)。