14362-13-1

Basic information

• Product Name: dibromomethyl
• Synonyms: Dibromomethyl radical; Methyl, dibromo-
• CAS NO: 14362-13-1
• Molecular Formula: CHBr₂
• Molecular Weight: 172.8266
• Mol File: 14362-13-1.mol
• Article Data: 3

Chemical Properties

• CAS DataBase Reference: dibromomethyl(CAS DataBase Reference)
• NIST Chemistry Reference: dibromomethyl(14362-13-1)
• EPA Substance Registry System: dibromomethyl(14362-13-1)

Safety Data

• Hazardous Substances Data: 14362-13-1(Hazardous Substances Data)

Upstream product

• 75-25-2 Bromoform 
• 74-95-3 1,1-dibromomethane 

Relevant articles and documents

Absolute rate constants for the reactions of Cl atoms with CH3Br, CH2Br2, and CHBr3

The rate constants for the reactions of chlorine atoms with the complete series of the three bromomethanes CH3Br (1), CH2Br2 (2), and CHBr3 (3) were measured in a very low pressure reactor, employing a microwave discharge for the generation of Cl atoms with mass spectrometric detection of reactants and products. The experiments were performed in the temperature range 273-363 K and at total pressures approximately 1 m Torr. The reactions proceed via hydrogen atom transfer leading to HCl product and the corresponding bromomethyl radicals. Their rate constant expressions are (in cm3 molecule-1 s-1): k1 = (1.66±0.14)×10-11 exp(-1072±46/T), k2 = (0.84±0.15)×10-11 exp(-911±101/T), and k3 = (0.43±0.11)×10-11 exp(-809±142/T). The activation energy of the reaction decreases with additional bromine substitution, which is attributed to the gradual weakening of the corresponding C-H bond strength. Ab initio theoretical calculations performed at the MP2/6-31++G(2d,2p) level of theory suggest C-H bond strengths for CH3Br, CH2Br2, and CHBr3 of 416.58, 407.03, and 396.60 kJ mol-1, respectively.