344599-55-9

Basic information

• Product Name: 5-Hydroxy-8,8-dimethyl-2,3-diphenyl-8H-pyrano<2,3-h>chromone
• CAS NO: 344599-55-9
• Molecular Weight: 396.442
• Mol File: 344599-55-9.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: 5-Hydroxy-8,8-dimethyl-2,3-diphenyl-8H-pyrano<2,3-h>chromone(CAS DataBase Reference)
• NIST Chemistry Reference: 5-Hydroxy-8,8-dimethyl-2,3-diphenyl-8H-pyrano<2,3-h>chromone(344599-55-9)
• EPA Substance Registry System: 5-Hydroxy-8,8-dimethyl-2,3-diphenyl-8H-pyrano<2,3-h>chromone(344599-55-9)

Safety Data

• Hazardous Substances Data: 344599-55-9(Hazardous Substances Data)

Upstream product

• 1111-97-3 3-chloro-3-methylbut-1-yne 
• 18651-39-3 5,7-Dihydroxy-2,3-diphenylchromone 
• 93-97-0 benzoic acid anhydride 
• 727-71-9 2-phenyl-2',4',6'-trihydroxyacetophenone 
• 87288-49-1 5-Hydroxy-2,3-diphenyl-7-(1,1-dimethylpropargyloxy)chromone 

Relevant articles and documents

A Study of the Base-catalysed Wessely-Moser Rearrangement of Angularly Condensed 2,2-Dimethyl-2H-pyrano Derivatives of 5-Hydroxy-2-methylchromones and 2,3-Diphenylchromones and related 1-Hydroxyxanthone

2-Methyl group in 5-hydroxy-2,8,8-trimethyl-8H-pyranochromone (4a) does not hinder base-catalysed isomerisation to afford the corresponding linear isomer (5a); whereas the presence of of phenyl group in position 2 and 3 as in 4c brings no such change.Similarly, 6-hydroxy-3,3-dimethyl-3H-pyranoxanthone (8) does not undergo alkali isomerisation. 5,7-Dihydroxy-2-methylchromone (2a) with 2-chloro-2-methyl-3-butyne in the presence of K2CO3, KI and DMF yields both the linear and angular 2,2-dimethyl-2H-pyrano derivatives (5a and 4a respectively) besides the 1,1-dimethylpropargyl ether (3a), the ratio being 2:4:3.However, under similar conditions 5,7-dihydroxy-2,3-diphenylchromone (2b) yields 3b, 4c and 5c in the ratio of only 5:14:1; again the tendency of forming linear isomer (5c) is far less than that of the angular isomer (4c).