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The Inorganic Synthesis sequence presents all clients of inorganic elements with exact and foolproof approaches for the instruction of vital and well timed compounds. This new quantity comprises details on water-solubilizing ligands for organometallics, labile ligand complexes, and the syntheses of cluster compounds and hydrides.

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22. 23. 24. 25. 26. ; Mc Grath, J. E . Adv. Polym. Sci. 1988, 86, 1. Wagener, K . ; Wanigatunga, S. Trends Polymer Sci. 1996, 4, 157. ; Matyjaszewski, K. ACS Polymer Preprints 1997, 38, 701. ; Möller, M. Macromolecules 1996, 29, 3397. Chang, T. ; Chen, H. ; Chiu, Y. S. J. Polym. Sci. Part A 1996, 34, 2613, 3313. Chojnowski, J. In Siloxane Polymers Clarson, S. ; Semlyen, J. 3-71. Chojnowski, J. J. Inorg. Organometal. Polym. 1991, 1, 199. Jungst, C . D . ; Weber, W . P. J. Polym. Sci. Part A 1987, 25, 1967.

Trimethylsilyltrifluoromethane sulphonate is added to assist the acid as suggested by Lebrun, Sauvet and Sigwalt [34]. The D is dried as in the Brown and Slusarczuk reaction but the dichloromethane (methylene chloride) solvent is not, as in this case a trace amount of water is required for the reaction to proceed. The reaction is carried out at room temperature under a nitrogen atmosphere (to prevent the introduction of excess water) for up to 48hrs. ch004 Si—0 \ / Si 0 \ \ /; s - c , + H 0 «. 2 f / Si—O-H + H O — / - S i — -0 \ / / // w S; CK + H-0 0 Si— - O - H + Si \ CF3SO3H \ 0 / \ + CF3SO3H 1 Si \ / Si— 0 \ J Si + H,0 \ Figure 4; Chojnowski reaction mechanism.

The end group is reversibly transformed with the participation o f acid to the tertiary oxonium ion, which is the active propagation center. The fast equilibrium 5b lies strongly on the side o f the ester which creates conditions for a controlled stepwise growth of the polymer chain. However, the data presented in Table I indicate that the above mechanism is oversimplified for the polymerization o f monomer 1. The polydispersity factor is higher than that expected for the controlled polymerization and the process leads to a high yield o f cyclic oligomers.

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A Comprehensive Treatise Inorganic and Theoretical Chemistry by Mellor J.W.


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