67884-63-3

Basic information

• Product Name: Cyclopropane, 1,1-difluoro-2-methylene-
• CAS NO: 67884-63-3
• Molecular Formula: C4H4F2
• Molecular Weight: 90.0726
• Mol File: 67884-63-3.mol
• Article Data: 3

Chemical Properties

• CAS DataBase Reference: Cyclopropane, 1,1-difluoro-2-methylene-(CAS DataBase Reference)
• NIST Chemistry Reference: Cyclopropane, 1,1-difluoro-2-methylene-(67884-63-3)
• EPA Substance Registry System: Cyclopropane, 1,1-difluoro-2-methylene-(67884-63-3)

Safety Data

• Hazardous Substances Data: 67884-63-3(Hazardous Substances Data)

Upstream product

• 88766-66-9 4-(difluoromethylene)-4,5-dihydro-3H-pyrazole 
• 463-49-0 1,2-propanediene 
• 754-25-6 trimethyl(trifluoromethyl)tin 
• 428-59-1 Hexafluoropropene oxide 

Downstream Products

• 112762-90-0 1,1-difluoro-6,6-diphenyl-4,5-diazaspiro<2.4>hept-4-ene 
• 112762-93-3 1,1-difluoro-4,4-diphenylspiropentane 

Relevant articles and documents

THERMAL AND PHOTOCHEMICAL DEAZETATIONS OF FLUORINE-SUBSTITUTED 4-METHYLENEPYRAZOLINES. THE KINETIC BEHAVIOR OF TRIMETHYLENEMETHANES.

4-(Difluoromethylene)-1-pyrazoline and 4-(fluoromethylene)-1-pyrazoline were observed to undergo thermal and photochemical deazetation in the gas phase as well as in solution to form mixtures of methylenecyclopropanes. The gas-phase and solution-phase, thermal, and photochemical results are contrasted, and the observed kinetically controlled product ratios are compared with the very different equilibrium values. As a result, mechanisms involving trimethylenemethane diradicals are proposed for both processes. The photochemical reactions seem to be dominated by 'hot' reactions of vibrationally excited TMMs, while the thermal reactions show interesting selectivity in their cyclization processes.

CARBENE CHEMISTRY. PART 13 . PREPARATION OF SOME FLUOROALLENES BY A CARBENE ROUTE, AND THE REACTION OF ALLENES WITH HALOGENOCARBENES

Fluoroallene and 1,3-difluoroallene are prepared in good overall yield by the addition of dichlorocarbene to vinyl fluoride and 1,2-difluoroethylene respectively, followed by pyrolysis of the dichlorocyclopropanes and treatment of the resulting dichloropropenes with zinc.Pyrolysis of 1,1-dichloro-2-fluorocyclopropane over zinc gives fluoroallene directly.The reaction of allene with 2,2,3-trifluoro-3-trifluoromethyloxiran at 180 deg C as a source of difluorocarbene gives both 1,1-difluoro-2-methylenecyclopropane and its rearrangement product 1-(difluoromethylene)cyclopropane, the latter reacting more readily with a second difluorocarbene to give 2,2,3,3-tetrafluorospiropentane.In an analogous way, fluoroallene reacts with dichlorocarbene, generated from trifluoro(trichloromethyl)silane at 140 deg C, to give E- and Z-1,1-dichloro-2-(fluoromethylene)cyclopropane, 1-(dichloromethylene)-2-fluorocyclopropane, and 2,2,3,3-tetrachloro-4-fluorospiropentane.