[4+2] - cycloaddition of singlet oxygen to conjugated acyclic hexadienes : evidence of singlet oxygen induced cis ⇌ trans - isomerization
作者:Klaus Gollnick、Axel Griesbeck
DOI:10.1016/s0040-4039(00)86254-1
日期:1983.1
Addition of singlet oxygen to trans, trans-2,4-hexadiene (1) occurs stereospecifically to give endoperoxide 2. With cis,trans-2,4-hexadiene (4), however, a mixture of diastereomeric endoperoxides, 2 + 5, is observed. Evidence of a singlet oxygen - induced cis ⇌ trans - isomerization is gained by competitive Diels-Alder reaction of 4 with singlet oxygen / diethyl diazenedicarboxylate.
将单线态氧加至反式,反式-2,4-己二烯(1)立体定向生成内过氧化物2。然而,与顺式,反式-2,4-己二烯(4)混合使用非对映异构的内过氧化物2 + 5,被观察到。通过4与单线态氧/二氮杂二羧酸二乙酯的竞争Diels-Alder反应,获得了单线态氧诱导的顺式反式异构化的证据。