Palustric ester photochemical ring opening

The photochemical ring opening of palustric ester (90), an example of a [l,2]-annulated cyclohexa-diene, has been achieved wherein a -1 1 photostationaiy state mixture of diene (90) and triene (91) was obtained. Upon heating for 4 h (162 °C), the photo-mixture regenerates palustric ester (90). A related interconversion was observed for a series of photochromic cyclohexadienes of the xanttenone, dibenzo-furan and acridone types, exemplified by (92) —> (93). °... 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ , ]

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