A Qualitative Investigation of the Kinetic Spectra of Recoil Bromines f r om t h e Three Nuclear Transformations: 79Br(n, γ)80Br, 82mBr(I.T.)82Br and 80mBr(I.T.)80 Br

Saeki, Masakatsu; Tachikawa, Enzo

doi:10.1524/ract.1973.20.12.27

Cited by 4 publications

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“…has been studied in both the gas and condensed phases [11][12][13][14][15][16][17][18][19][20][21] with considerable effort being put forth to understanding the primary * Author to whom correspondance should be sent.…”

Section: Introductionmentioning

confidence: 99%

Stereochemical Consequences of Recoil Halogen Atom Substitution

1993

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Isomeric transition / Bromine-82m / Stereochemistry / 2,3-Bromohalobutanes SummaryThe substitution reactions of 82 Br-for-Br generated by the 82m Br---> 82 Br nuclear transformation, were studied in (2S,3R)-and (2S,3S)-bromolluorobutane and (2S,3R)-and (2S,3S)-dibromobutane. Experiments were carried out in the gas phase for all compounds and in the condensed phase and in solutions of n-hexane and acetonitrile for bromofluorobutane. The results show for gas phase systems for 82 Br-for-Br substitution a net retention of configuration in the (2S,3S)-halobutanes and net inversion of configuration in (2S,3R)-halobutane in the gas phase. In the condensed phase 82 Br-for-Br substitution at the chiral centers resulted in nearly equal retention and inversion of configuration.

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Section: Introductionmentioning

confidence: 99%

Stereochemical Consequences of Recoil Halogen Atom Substitution

1993

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Heavy Ions in Hot Atom Chemistry

Cacace

1985

Treatise on Heavy-Ion Science

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Reactions of Recoil 80Br Activated by the (n, γ) Process with Some Gaseous Cyclanes (C4–C6)

Saeki¹,

Tachikawa²

1976

Bulletin of the Chemical Society of Japan

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The reactions of 80Br from the (n,γ) process with cyclanes (C4–C6) have been systematically investigated. The primary products formed by the 80Br-for-H reaction were excited and underwent at least two modes of unimolecular decomposition. One was the elimination of the H80Br molecule, and the other was the cleavage of the ring, giving the corresponding bromo-olefin and olefin. The former process was important particularly in the lower-pressure end. Thus, the reaction was easily suppressed by increasing the pressure. However, the latter process showed a different feature; that is, the yields of the decomposition products stayed at an almost constant level over the whole pressure range studied. This indicates that a highly excited product decomposes preferentially through a ring-cleavage reaction. When the total organic yield from each reaction system was plotted against the carbon number of the reactant molecules, a linear correlation was obtained. After some possible consideration, it was concluded that the life of the intermediate complex might play a more important role in the reaction of 80Br with cyclanes than the other factors. Some considerations about the radiolysis of the reactant molecule are also mentioned.

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A Qualitative Investigation of the Kinetic Spectra of Recoil Bromines f r om t h e Three Nuclear Transformations: ⁷⁹Br(n, γ)⁸⁰Br, ^82mBr(I.T.)⁸²Br and ^80mBr(I.T.)⁸⁰ Br

Cited by 4 publications

References 0 publications

Stereochemical Consequences of Recoil Halogen Atom Substitution

Stereochemical Consequences of Recoil Halogen Atom Substitution

Heavy Ions in Hot Atom Chemistry

Reactions of Recoil 80Br Activated by the (n, γ) Process with Some Gaseous Cyclanes (C4–C6)

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