Benzene, (bromomethyl)-

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Gas phase 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 by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Quantity Value Units Method Reference Comment
Δfgas84. ± 4.kJ/molEqkBenson and Buss, 1957 

Condensed phase 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 by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Quantity Value Units Method Reference Comment
Δfliquid22.kJ/molCmHolm, 1973Grignard Rx
Δfliquid16. ± 2.kJ/molChydAshcroft, Carson, et al., 1963 
Δfliquid30. ± 14.kJ/molCmFowell and Mortimer, 1961 

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

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

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]

Holm, 1973
Holm, T., Thermochemistry of Grignard reagents. Enthalpies of formation of alkylmagnesium bromides and of alkyl bromides, J. Organomet. Chem., 1973, 56, 87-93. [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]

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]

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]


Notes

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