Polyhalogeno-allenes and -acetylenes. Part 16. Further 1,3-dipolar cycloadditions to perfluoropropadiene
作者:Gordon B. Blackwell、Robert N. Haszeldine、David R. Taylor
DOI:10.1039/p19830000001
日期:——
The nitrones PhCHN+(R)O–(R = Me, Et, PhCH2, and Ph) react rapidly with perfluoropropadiene to give the corresponding 2-R-4-difluoromethylene-5,5-difluoro-3-phenylisoxazolidines in good yield, although these isoxazolidines are unstable and decompose during catalytic hydrogenation. Perfluoropropadiene also reacts with diazophenylmethane and diazodiphenylmethane, giving 4-difluoromethylene-3,3-difluoro-5-phenyl-
硝酮PhCH N +(R)O –(R = Me,Et,PhCH 2和Ph)与全氟丙二烯迅速反应,得到相应的2-R-4-二氟亚甲基-5,5-二氟-3-苯基异恶唑烷尽管这些异恶唑烷在催化氢化过程中不稳定并分解,但仍能得到收率。Perfluoropropadiene也与反应和diazophenylmethane diazodiphenylmethane,得到4-二氟亚甲基-3,3-二氟-5-苯基和5,5-二苯基- Δ 1-吡唑啉。二苯基吡唑啉在蒸馏时分解,得到3-二氟亚甲基-2,2-二氟二苯基环丙烷。这些偶极环加成的区域专一性是与前沿轨道理论相关的。苯甲酰重氮苯基甲烷在与全氟丙二烯的缓慢反应中分解,并且分离出的唯一加合物是3-二氟亚甲基-2,2-二氟-4,5-二苯基二氢呋喃。重氮二苯基甲烷与全氟丙炔反应,生成1:1的加合物,据认为是5-氟-3,3-二苯基-4-三氟甲基-3 H-吡唑。