Archaeological Chemistry IV by Ralph O. Allen (Ed.)

By Ralph O. Allen (Ed.)

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However, this does not involve a radical substitution reaction. Net reaction: 2 O3 Initiation reaction: hnUV CmHnCloFp Propagation steps: Fig. 12. FCHC-initiated decomposition of stratospheric ozone. 6 Radical Chemistry of Alkylmercury(II) Hydrides Fig. 13. 14). 13). Oxymercuration provides (b-hydroxyalkyl)mercury(II) carboxylates, while alkoxymercuration gives (balkoxyalkyl)mercury(II) carboxylates. These compounds can be reduced with NaBH4 to the corresponding mercury(II) hydrides. A ligand exchange takes place at the mercury: a carboxylate substituent is replaced by hydrogen.

Initiation involves several reactions, which lead to Br• as the initiating radical. 26 shows one of several possible starting reaction sequences. Next follow three propagation steps. The second propagation step—something new in comparison to the reactions discussed before—is an ionic reaction between NBS and HBr.

It is interesting that they make an evaluation of the relative rates of formation of these radicals possible. 2). 10. A whole series of such reactions was carried out, and their reaction enthalpies DHr, were determined. They were all endothermic reactions (DHr has a positive sign). Each substrate was thermolyzed at several different temperatures T and the associated rate constants kr were determined. 1). 2 after (a) dividing by T, (b) taking the logarithm, and (c) differentiating with respect to T.

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