430-44-4

Basic information

• Product Name: 2-fluorobut-1-ene
• Synonyms: 1-butene, 2-fluoro-; 2-Fluorobut-1-ene
• CAS NO: 430-44-4
• Molecular Formula: C₄H₇F
• Molecular Weight: 74.0968
• Mol File: 430-44-4.mol
• Article Data: 1

Chemical Properties

• Boiling Point: 10.6°C at 760 mmHg
• Density: 0.78g/cm³
• Vapor Pressure: 1260mmHg at 25°C
• Refractive Index: 1.347
• CAS DataBase Reference: 2-fluorobut-1-ene(CAS DataBase Reference)
• NIST Chemistry Reference: 2-fluorobut-1-ene(430-44-4)
• EPA Substance Registry System: 2-fluorobut-1-ene(430-44-4)

Safety Data

• Hazardous Substances Data: 430-44-4(Hazardous Substances Data)

Relevant articles and documents

Fluorine shifts in gaseous cations. Analogues of Wagner-Meerwein rearrangements

In the gas phase ionized (CH3)2CFCH2OPh (where the asterisk designates a 13C-label) decomposes to yield ionized phenol via two competing pathways, both of which pass through intermediate ion-neutral complexes. One pathway involves methyl shift, which produces complexes that contain 2-fluorobutyl cations. The other pathway involves fluorine transposition, which forms complexes containing fluoro-tert-butyl cations. The distribution of 13C in the recovered neutral fluoroalkenes confirms that fluorine migration has indeed taken place, and SCF computations point toward a bridged, three-member cyclic transition state. Ab initio calculations provide an ordering of C4H8F+ structures, some of which are isoelectronic with C4H8O epoxy and carbonyl compounds, as well as those that have no stable isoelectronic neutral counterparts.