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(a) Barhate, N. B.; Gajare, A. S.; Wakharkar, R. D.; Bedekar, A. V. Tetrahedron Lett. 1998, 39, 6349-6350.
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11
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0033607004
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Enzymatic oxybromination processes are popular research subjects, and several novel ideas have been published. See, for example: (a) Sels, B.; De Vos, D.; Butinx, M.; Pierard, F.; Kirsch-De Mesmaeker, A.; Jacobs, P. Nature 1999, 400, 855-857.
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Sels, B.1
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(c) Martinez-Perez, J. A.; Pickel, M. A.; Caroff, E.; Woggon, W.-D. Synlett 1999, 1875-1878. However, implementation of enzymatic processes has serious drawbacks, not least because such reactions are carried out in very dilute solutions, and thus require enormous reaction tanks, meaning high capital costs in a market where the current technology is well-established and retains size advantage. Several VBPO mimics have been reported, but it is unlikely that in the near future they would lead to an enzymatic oxybromination process, which would have to compete on a very narrow profit margin.
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Synlett
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Martinez-Perez, J.A.1
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(a) Jerzy. G.; Slawomir, Z. Synth. Commun. 1997, 27, 3291-3299. Generally, for oxychlorination a large excess of HCl is required, see:
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For a discussion, see Sheldon, R. A. Chem. Ind. 1992, 903-906; CHEMTECH 1994, 38-47.
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Sheldon, R.A.1
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For a discussion, see Sheldon, R. A. Chem. Ind. 1992, 903-906; CHEMTECH 1994, 38-47.
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Bhattacharjee, M. Polyhedron 1992, 11, 2817-2818. See also ref 6b, and Bhattacharjee, M.; Chaudhuri, M. K.; Islam, N. S.; Paul, P. C. Inorg. Chim. Acta 1990, 169, 97-100.
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Bhattacharjee, M. Polyhedron 1992, 11, 2817-2818. See also ref 6b, and Bhattacharjee, M.; Chaudhuri, M. K.; Islam, N. S.; Paul, P. C. Inorg. Chim. Acta 1990, 169, 97-100.
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2] at 25 °C, The Merck Index; Merck & Co., Inc.: Rahway, 1989; pp 323; 211.
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24
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85037761571
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2
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2.
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26
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0040334387
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However, in all cases (even when using KBr/AcOH in the absence of catalyst), enough bromine was generated to cause coloration of the samples. cf. Maass, O.; Hiebert, P. G. J. Am. Chem. Soc. 1924, 46, 290-308.
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27
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85037765843
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The slow reaction observed with perchloric acid is probably a result of its low solubility in the reaction medium. Significant amounts of solid perchlorates were observed even when the amount of water was doubled
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The slow reaction observed with perchloric acid is probably a result of its low solubility in the reaction medium. Significant amounts of solid perchlorates were observed even when the amount of water was doubled.
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28
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85037749972
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4, and HBr would all dissociate completely under the aqueous conditions employed. Thus, the differences shown in Figure 1 may reflect possible participation of the inorganic anions in the catalytic decomposition process
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4, and HBr would all dissociate completely under the aqueous conditions employed. Thus, the differences shown in Figure 1 may reflect possible participation of the inorganic anions in the catalytic decomposition process.
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