Studies on condensed polycyclic aromatic compounds having photochromic properties. II. Synthesis and photochromic properties of methyl derivatives of benzo[1,2,3-kl:4,5,6-k'l']dixanthene and their endoperoxides.
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Methyl derivatives [3d] of benzo[1, 2, 3-kl: 4, 5, 6-k′l′]dixanthene [3a] were synthe; ized by the cyclization of 1, 5-diphenoxyanthraquinones, which were prepared from 1, 5-dichloroanthraquinone and potassium salt of cresol or xylenol. Electronic absorption spectra of [3b]-[3d] showed almost the same profile as that of [3a]. The photooxidation of the above red compounds[3b]-[3d] with visible light of 541 nm gave the colorless endoperoxides[4b]-[4d]. Tetramethyl derivative [3d], which is the most sterically hinder ed one among the compounds from [3a] to [3d] photooxidized about 1.5 times faster than [3a]-[3c]. Endoperoxide [4d] showed better thermal stability than those of [4a]-[4c].
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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