Photochemistry of heterocycles——VIII. photocycloaddition of acetylenic compounds to 1,3-dimethyl-6-a

• 出 处: Acta Chimica Sinica(English Edition)
• 发表日期: 1989年06期
• 关键词: trimethyl hydroxymethyl methoxyl excited complexes dimethoxy distillation have a

The photocycloadditions of 1,3-dimethyl-6-azathymine to 2-butyne-1,4-diol and 1,4-di-methoxyl-2-butyne have been studied. Three novel compounds, 7,8-bis(hydroxymethyl)-3,5-dioxo-2,4,6-trimethyl-1,2,4-triazabicyclo [4,2,0]-7-octene (1), 7,8-bismethoxymethy1-3,5-dioxo-2,4,6-trimethyl-1,2,4-triazabicyclo[4,2,0]-7-octene (2) and 8,9-bismethoxymethy1-4-oxo-1,3,5-trimethyl-7-oxa-2,3,5-triazaspiro[5,3]-1,8-nonadiene (3) were obtained. The proposed reaction mechanism, whichincludes excited triplet complexes and biradicals as intermediates, was supported by kinetic anaphotophysical studies.

The photocycloadditions of 1,3-dimethyl-6-azathymine to 2-butyne-1,4-diol and 1,4-di-methoxyl-2-butyne have been studied. -3,5-dioxo-2,4,6-trimethyl-1,2,4-triazabicyclo [4,2,0] -7- octene (1), 7,8-bismethoxymethy1-3,5-dioxo-2 , 4,6-trimethyl-1,2,4-triazabicyclo [4,2,0] -7-octene (2) and 8,9-bismethoxymethy1-4-oxo-1,3,5-trimethyl-7-oxa The proposed reaction mechanism, whichincludes excited triplet complexes and biradicals as intermediates, was supported by kinetic anaphotophysical studies.