42206-10-0

Basic information

• Product Name: bicyclo[4.2.0]octa-1,5-diene
• Synonyms: Bicyclo(4.2.0)octa-1,5-diene; Bicyclo[4.2.0]octa-1,5-diene
• CAS NO: 42206-10-0
• Molecular Formula: C₈H₁₀
• Molecular Weight: 106.165
• Mol File: 42206-10-0.mol
• Article Data: 4

Chemical Properties

• Boiling Point: 199.2°C at 760 mmHg
• Flash Point: 46.1°C
• Density: 0.96g/cm³
• Vapor Pressure: 0.488mmHg at 25°C
• Refractive Index: 1.54
• CAS DataBase Reference: bicyclo[4.2.0]octa-1,5-diene(CAS DataBase Reference)
• NIST Chemistry Reference: bicyclo[4.2.0]octa-1,5-diene(42206-10-0)
• EPA Substance Registry System: bicyclo[4.2.0]octa-1,5-diene(42206-10-0)

Safety Data

• Hazardous Substances Data: 42206-10-0(Hazardous Substances Data)

Upstream product

• 40117-13-3 2,3-Dimethylenbicyclo<2.2.0>hexan 
• 106-99-0 buta-1,3-diene 
• 73473-80-0 1,2-Dihydrophthalyltosylat 
• 42464-53-9 5,6-dimethylene-2,3-diaza-bicyclo[2.2.2]oct-2-ene 
• 37343-83-2 2,3-dimethylenecyclohexa-1,3-diene 
• 42206-11-1 1,2-Divinyl-1-cyclobuten 
• 3642-10-2 1,2,6,7-Octatetraene 
• 3642-21-5 [4]dendralene 
• 62486-05-9 1,4-bis(triphenylphosphorylidene)butane 
• 33689-28-0 cyclobutane-1,2-dione 

Downstream Products

• 3642-21-5 [4]dendralene 
• 42206-11-1 1,2-Divinyl-1-cyclobuten 
• 82447-56-1 3,4-Dimethylen-1-cyclohexen 
• 74002-41-8 C₁₆H₁₅N₃O₂ 

Relevant articles and documents

The Energy-Well of Diradicals, II. The 2,3-Dimethylene-1,4-cyclohexadiyl

The trapping of the 2,3-dimethylene-1,4-cyclohexadiyl (2), generated by the thermolysis of 7, with 1,3-butadiene as well as with oxygen in the gas phase is described.These reactions compete with the intramolecular stabilisation of the diradical, yielding 3 and 4.From the temperature dependence of the competing processes the difference in the activation energies of these reactions is derived.On the assumption, that the trapping reaction with oxygen does not have any significant energy barrier, the energy-well of the diradical 2 is calculated to be 16 kcal/mol.

Isolation and Energy Well of the 2,3-Dimethylene-1,4-cyclohexadiyl Diradical

Irradiation of both 5,6-dimethylene-2,3-diazabicyclooct-2-ene (1) and 2,3-dimethylenebicyclooctan-7-one (2) matrix isolated in argon yields the 2,3-dimethylene-1,4-cyclohexadiyl diradical (8), which was characterized by its UV and IR spectra.From the decomposition rate of 1, the dimerisation rate of 8, determined by flash photolysis of 1, and the product ratio of the monomeric and dimeric products obtained from 8, the energy well of 8 has been determined to be 23.8 kcal mol-1.