Selectivity in Thermal <sup>34m</sup>Cl-for-CI Exchange with Chlorobenzenes

Veenboer, J.Th.; Halteren, B. W. Van; Briνkman, G. A.

doi:10.1524/ract.1986.40.3.129

Cited by 3 publications

(3 citation statements)

References 26 publications

(42 reference statements)

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“…This can be substantiated by the results of VEENBOER etal. [8] who have observed almost the same *C1-for -CI substitution yields 55%) for C 6 H S C1 and C 6 F 5 C1 and also by those of BEREI etal. [9] for C 6 H 5 C1 and o-C 6 H 4 FCl 25%) systems (the dose received by the samples in the former case was 7.5 kGy compared with 0.1 kGy in the latter).…”

Section: Resultssupporting

confidence: 76%

“…BRINKMAN and coworkers have found that in 1 : 1 : 1 mixtures of isomeric dichlorobenzenes [5] and in the respective chlorotoluenes [4], the ο: m : ρ substitution yields were almost statistical, whereas the distribution for thermal exchange was very selective, favouring the o-and p-isomers. They have recently extended their studies to different mixtures of isomeric C 6 H 4 C1X (X = F, CI, CH 3 , CF 3 ) compounds to obtain more information on aspects such as relative rates and selectivity for exchange [8]. BEREI etal.…”

Section: Introductionmentioning

confidence: 99%

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Recoil ³⁸CI Reactions with Halobenzenes: Substituent Effects

Chandrasekhar¹,

Rao²

1989

Radiochimica Acta

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Reactions of recoil 3 8 CI atoms with substituted halobenzenes have been investigated. The organic yields in all the investigated systems were enhanced when the samples were exposed to a relatively high accompanying gamma dose. The results suggest that the substituent F on the benzene ring has no effect on the reactions of recoil 3, C1 atoms. I 2 had no effect on the yields measured with o-and p-C 6 H 4 FCH,Cl compounds, suggesting the absence of thermal reactions. However, both the total organic and parent yields were considerably reduced in o-and p-C 6 H 4 C1CF 3 compounds when I 2 was added. The lower 38 C1-for-Cl substitution yield in o-C"H 4 C1CFJ than that in para isomer was attributed to steric effects. Relative reactivities of recoil CI in mixtures of some of the investigated compounds were evaluated using the model developed by KONTIS and URCH.

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Section: Resultssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Recoil ³⁸CI Reactions with Halobenzenes: Substituent Effects

Chandrasekhar¹,

Rao²

1989

Radiochimica Acta

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“…It is true from the fact that the yields ( ~ 6%) are almost the same in the presence of I2 where mostly hot substitution reactions are possible and are not selective. In the very recent study by VEENBOER et al [15], the rate constant for Cl-for-Br substitution in m-C6H4BrX (X = F, Cl) is found to be much lower than for the ortho isomers.…”

Section: Resultsmentioning

confidence: 88%

Reactions of Nucleogenic Bromine Atoms with Bromobenzenes

Chandrasekhar

Rao

1987

Radiochimica Acta

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Recoil bromine /Bromobenzenes /Selectivity effects AbstractReactions of recoil """Br with substituted bromobenzenes are investigated. The total organic yields in mono-and dibromobenzenes are significantly higher than in bromotoluenes. The parent yields in m-dibromobenzene are lower than in the ortho isomer suggesting lower absolute rate for Br-for-Br exchange in the former in contrast to the behaviour with bromotoluenes where the parent yields are comparable. Relative reactivities of recoil bromine based on the model of KONTIS and URCH are evaluated and the reactivity parameters in the mixtures of the investigated Compounds and the corresponding chlorocompounds are compared and the chemical processes involved are discussed.

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