17502-37-3

Basic information

• Product Name: 2H-Pyran, 3,4-dihydro-6-methyl-2-(1-methylethenyl)-
• CAS NO: 17502-37-3
• Molecular Formula: C9H14O
• Molecular Weight: 138.21
• Mol File: 17502-37-3.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: 2H-Pyran, 3,4-dihydro-6-methyl-2-(1-methylethenyl)-(CAS DataBase Reference)
• NIST Chemistry Reference: 2H-Pyran, 3,4-dihydro-6-methyl-2-(1-methylethenyl)-(17502-37-3)
• EPA Substance Registry System: 2H-Pyran, 3,4-dihydro-6-methyl-2-(1-methylethenyl)-(17502-37-3)

Safety Data

• Hazardous Substances Data: 17502-37-3(Hazardous Substances Data)

Upstream product

• 28450-02-4 2-acetyl-6-methyl-2,3-dihydropyran 
• 1779-49-3 Methyltriphenylphosphonium bromide 

Downstream Products

• 41723-53-9 5-acetyl-1-methylcyclohexene 
• 80816-31-5 4-(1-hydroxyethyl)-2-methyl-1-cyclohexene 
• 25094-54-6 4-(1-hydroxy-1-methylethyl)-2-methyl-1-cyclohexene 

Relevant articles and documents

Comportement sous impact electronique des dihydro-2,3 4H-pyrannes: isomerisation des ions moleculaires avant fragmentation

Studies of electron impact (EI) mass spectra of some 2-substituted-2,3-dihydro-4H-pyrans demonstrated the occurence of a specific rearrangement of the molecular ion prior to fragmentation.Mass spectra of three carbonyl derivatives were examined: 2-acetyl-6-methyl-2,3-dihydro-4H-pyran, 2-propionyl6-methyl-2,3-dihydro-4H-pyran, and 2-valeryl-6-methyl-2,3-dihydro-4H-pyran.Deuterium-labelling showed this rearrangement to be favoured at reduced internal energy.It may lead to another dihydropyran isomer after cleavage of the O-(C-2) bond of the heterocycle.The Mike-spectra T0.5 values and appearence energy measurements confirmed this proposition. 2,3-Dihydro-4H-pyrans substituted by a vinyl group at C-2 underwent the same rearrangement. 2-Vinyl-2,3-dihydro-4H-pyran and cyclohex-3-ene-1-carboxaldehyde showed identical Mike-spectra and T0.5 values.This mechanism makes it possible to explain the intense peaks at (M-CHO.)(+) and (M-C2H3O.)(+) respectively observed in the mass spectra of 2-isopropenyl-2,3-dihydro-4H-pyran and 2-isopropenyl-6-methyl-2,3-dihydro-4H-pyran.The Mike-spectra of the ions (m-29) and (M-43) were compared with the Mike -spectrum of the ion (M-H) of 1-methyl-1-cyclohexene, and T0.5 values measured for the principal transitions found to be identical.The syntheses of the different products were reported.