152151-57-0Relevant articles and documents
Synthesis and photochromic properties of spiro[naphthopyran-7′H- benzocyclohepta-5′,8′-dienes]
Crossley, Daniel L.,Gabbutt, Christopher D.,Mark Heron,Kay, Paul,Mogstad, Martin
experimental part, p. 62 - 68 (2012/07/03)
A series of spironaphthopyrans has been synthesised by the acid-catalysed condensation between either a substituted 1-naphthol or 2-naphthol and the propargylic alcohol derived from the addition of lithium trimethylsilylacetylide to a 7H-benzocycloheptan-7-one with subsequent in situ silyl group removal. The photochromism of the novel spironaphthopyrans was characterised by a bathochromically shifted λmax coupled with a relatively quick initial fade of the photogenerated species relative to the comparable diphenyl substituted model compounds. After initial fading a relatively intense residual colour persisted for the spironaphthopyrans.
Photochromic naphthopyran compounds
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Example 7-8, (2008/06/13)
A naphthopyran compound represented by the formula: wherein R4, R5, R6, R7, R8, R9, R10, and R11are each selected from the group consisting essentially of hydrogen, a first stable organic radical, a heterocyclic group, halogen, a first nitrogen-substituted group, and a first nitrogen-substituted ring compound; A and B are each selected from the group consisting essentially of hydrogen, substituted phenyl, and substituted naphthyl, provided that at least one of A or B is substituted phenyl or substituted naphthyl; and any substituent of any substituted phenyl or substituted naphthyl at A or B is selected from the group consisting essentially of hydrogen, a second stable organic radical, a heterocyclic group, halogen, a second nitrogen-substituted group, and a second nitrogen-substituted ring compound, provided that at least one substituent of any substituted phenyl or substituted naphthyl at either A or B is phenyl, naphthyl, or furyl.
