Benzene, (bromomethyl)-

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Reaction thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
MS - José A. Martinho Simões
B - John E. Bartmess
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

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Individual Reactions

Benzene, (bromomethyl)- (l) + magnesium (cr) = C7H7BrMg (solution)

By formula: C7H7Br (l) + Mg (cr) = C7H7BrMg (solution)

Quantity Value Units Method Reference Comment
Δr-275.7 ± 4.4kJ/molRSCHolm, 1981solvent: Diethyl ether; Due to the possibility of side reactions, the enthalpy of reaction was not considered to be sufficiently reliable for deriving the enthalpy of formation of the Grignard reagent Holm, 1981; MS

C7H6Br- + Hydrogen cation = Benzene, (bromomethyl)-

By formula: C7H6Br- + H+ = C7H7Br

Quantity Value Units Method Reference Comment
Δr1557. ± 8.8kJ/molG+TSPoutsma, Nash, et al., 1997gas phase; acidity comparable to MeCN, between HF and tBuCH(Me)OH; B
Quantity Value Units Method Reference Comment
Δr1527. ± 8.4kJ/molIMRBPoutsma, Nash, et al., 1997gas phase; acidity comparable to MeCN, between HF and tBuCH(Me)OH; B

Hydrogen bromide + Benzene, (bromomethyl)- = Toluene + Bromine

By formula: HBr + C7H7Br = C7H8 + Br2

Quantity Value Units Method Reference Comment
Δr33.9 ± 4.2kJ/molEqkBenson and Buss, 1957gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = 33. ± 4. kJ/mol; ALS

Stannane, trimethyl(phenylmethyl)- (l) + Bromine (g) = Benzene, (bromomethyl)- (l) + C3H9BrSn (l)

By formula: C10H16Sn (l) + Br2 (g) = C7H7Br (l) + C3H9BrSn (l)

Quantity Value Units Method Reference Comment
Δr-226.6 ± 0.9kJ/molRSCPedley and Skinner, 1959Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970, 2.; MS

Benzene, (bromomethyl)- + Water = Hydrogen bromide + Benzyl alcohol

By formula: C7H7Br + H2O = HBr + C7H8O

Quantity Value Units Method Reference Comment
Δr-7.9kJ/molCmGellner and Skinner, 1949liquid phase; Heat of hydrloysis; ALS

C12H7MnO5 (cr) + 1.5Bromine (g) = Benzene, (bromomethyl)- (g) + manganese dibromide (cr) + 5Carbon monoxide (g)

By formula: C12H7MnO5 (cr) + 1.5Br2 (g) = C7H7Br (g) + Br2Mn (cr) + 5CO (g)

Quantity Value Units Method Reference Comment
Δr-194.5 ± 7.8kJ/molHAL-HFCConnor, Zafarani-Moattar, et al., 1982MS

Benzene, (bromomethyl)- + 0.5Hydrogen = Toluene + 0.5Bromine

By formula: C7H7Br + 0.5H2 = C7H8 + 0.5Br2

Quantity Value Units Method Reference Comment
Δr-4. ± 2.kJ/molChydAshcroft, Carson, et al., 1963liquid phase; ALS

Benzene, (bromomethyl)- + C4H9Li = Benzene, pentyl- + Lithium bromide

By formula: C7H7Br + C4H9Li = C11H16 + BrLi

Quantity Value Units Method Reference Comment
Δr-338. ± 11.kJ/molCmFowell and Mortimer, 1961liquid phase; ALS

References

Go To: Top, Reaction thermochemistry data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Holm, 1981
Holm, T., J. Chem. Soc., Perkin Trans. II, 1981, 464.. [all data]

Poutsma, Nash, et al., 1997
Poutsma, J.C.; Nash, J.J.; Paulino, J.A.; Squires, R.R., Absolute Heats of Formation of Phenylcarbene and Vinylcarbene, J. Am. Chem. Soc., 1997, 119, 20, 4686, https://doi.org/10.1021/ja963918s . [all data]

Benson and Buss, 1957
Benson, S.W.; Buss, J.H., The thermodynamics of bromination of toluene and the heat of formation of the benzyl radical, J. Phys. Chem., 1957, 61, 104-109. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

Pedley and Skinner, 1959
Pedley, J.B.; Skinner, H.A., Thermochemistry of metallic alkyls. Part 9.?Heats of bromination of some organo-tin compounds, Trans. Faraday Soc., 1959, 55, 544, https://doi.org/10.1039/tf9595500544 . [all data]

Pedley and Rylance, 1977
Pedley, J.B.; Rylance, J., Computer Analysed Thermochemical Data: Organic and Organometallic Compounds, University of Sussex, Brigton, 1977. [all data]

Cox and Pilcher, 1970, 2
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds in Academic Press, New York, 1970. [all data]

Gellner and Skinner, 1949
Gellner, O.H.; Skinner, H.A., Dissociation energies of carbon-halogen bonds. The bond strengths allyl-X and benzyl-X, J. Chem. Soc., 1949, 1145-1148. [all data]

Connor, Zafarani-Moattar, et al., 1982
Connor, J.A.; Zafarani-Moattar, M.T.; Bickerton, J.; El-Saied, N.I.; Suradi, S.; Carson, R.; Al Takkhin, G.; Skinner, H.A., Organomet., 1982, 1, 1166. [all data]

Ashcroft, Carson, et al., 1963
Ashcroft, S.J.; Carson, A.S.; Pedley, J.B., Thermochemistry of reductions caused by lithium aluminium hydride. Part 2.-The heats of formation of benzyl bromide, benzyl iodide and the benzyl radical, Trans. Faraday Soc., 1963, 59, 2713-2717. [all data]

Fowell and Mortimer, 1961
Fowell, P.A.; Mortimer, C.T., 735. Heats of formation and bond energies. Part V. n-Butyl-lithium, J. Chem. Soc., 1961, 3793-3796. [all data]


Notes

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