254-03-5

Basic information

• Product Name: 4H-chromene
• Synonyms: 4H-1-Benzopyran; 4H-Chromene
• CAS NO: 254-03-5
• Molecular Formula: C₉H₈O
• Molecular Weight: 132.1592
• Mol File: 254-03-5.mol
• Article Data: 3

Chemical Properties

• Boiling Point: 213.9°C at 760 mmHg
• Flash Point: 75.7°C
• Density: 1.095g/cm³
• Vapor Pressure: 0.234mmHg at 25°C
• Refractive Index: 1.571
• CAS DataBase Reference: 4H-chromene(CAS DataBase Reference)
• NIST Chemistry Reference: 4H-chromene(254-03-5)
• EPA Substance Registry System: 4H-chromene(254-03-5)

Safety Data

• Hazardous Substances Data: 254-03-5(Hazardous Substances Data)

Upstream product

• 25125-40-0 1-(2-(allyloxy)phenyl)-2-(tetrafluoro-λ⁵-boraneyl)diazene 
• 122-97-4 3-Phenyl-1-propanol 
• 254-04-6 2H-chromene 

Downstream Products

• 93514-42-2 2-phenylchromene 
• 1261361-45-8 2-(4-methoxyphenyl)-2H-chromene 
• 1255509-72-8 (R)-2-(4-methoxyphenyl)-2H-chromene 
• 104-53-0 3-phenyl-propionaldehyde 
• 1745-81-9 o-Allylphenol 
• 100-42-5 styrene 
• 271-89-6 1-benzofurane 
• 254-04-6 2H-chromene 

Relevant articles and documents

Iron-catalysed borylation of arenediazonium salts to give access to arylboron derivatives via aryl(amino)boranes at room temperature

Complementary to previously described Miyaura borylation methods, a new access to boron derivatives via aryl(amino)boranes is described. Direct coupling between aryldiazonium salts and diisopropylaminoborane is catalysed by 0.1% ferrocene leading to the formation of a carbon-boron bond. The obtained aryl(amino)boranes could eventually then be transformed into boronic acids, boronates or borates. Copyright

Oxidation of Arylalkanols by S2O82--CuII

Products of oxidation of a series of arylalkanols by S2O82--CuII in acetic acid and acetonitrile are consistent with initial oxidation to aryl radical cations followed by either loss of a benzylic proton or C-C bond scission and subsequent oxidation of intermediate benzylic radicals by CuII to final products. 1-Arylalkanols (ArCHOHR)react by both paths, C-C bond scission increasing with stability of the radical R.. 2-Arylalkanols (ArCH2CHOHR) give chiefly C-C bond scission to benzyl radicals and RCHO.The 3- and 4-arylalkanols undergo chiefly proton loss, and the resulting radicals are oxidized with cyclization to chromans and 2-phenylfurans, respectively, both of which may by oxidized in turn to further products.