38558-34-8

Upstream product

• 643-79-8 o-phthalic dicarboxaldehyde 
• 102-04-5 1,3-Diphenylpropanone 
• 64-17-5 ethanol 

Downstream Products

• 18043-52-2 7-Hydroxy-6.7.8-triphenyl-7H-benzocyclohepten 
• 102892-74-0 6,8-diphenyl-7-ethynyl-7H-benzocyclohepta-5,8-dien-7-ol 
• 1379508-47-0 6',8'-diphenyl-9-methoxyspiro[3H-naphtho[2,1-b]pyran-3,7'-7'H-benzocyclohepta-5',8'-diene] 
• 1379508-46-9 6',8'-diphenyl-8-methoxyspiro[3H-naphtho[2,1-b]pyran-3,7'-7'H-benzocyclohepta-5',8'-diene] 
• 1379508-45-8 6',8'-diphenylspiro[3H-naphtho[2,1-b]pyran-3,7'-7'H-benzocyclohepta-5',8'-diene] 
• 1379508-49-2 6',8'-diphenyl-5-methoxycarbonyl-6-methylspiro[2H-naphtho[1,2-b]pyran-2,7'-7'H-benzocyclohepta-5',8'-diene] 
• 1379508-48-1 5-ethoxycarbonyl-6,6',8'-triphenylspiro[2H-naphtho[1,2-b]pyran-2,7'-7'H-benzocyclohepta-5',8'-diene] 
• 18043-55-5 6,7,8,6',7',8'-Hexaphenyl-bi<5H.5'H-benzocycloheptenyl-(5,5')> 
• 14538-87-5 1-Methoxy-2,3,4-triphenyl-6,7-benzocycloheptatrien 
• 14377-16-3 1-Methoxy-2,3,4-triphenyl-6,7-benzocycloheptatrien 

Relevant academic research and scientific papers

Synthesis and photochromic properties of spiro[naphthopyran-7′H- benzocyclohepta-5′,8′-dienes]

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.