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during the submission-revision of the present manuscript, a similar reaction was reported, see: R. Maggi, A. Bello, C. Oro, G. Sartori, L. Soldi, Tetrahedron 2008, 64, 1435-1439.
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during the submission-revision of the present manuscript, a similar reaction was reported, see: R. Maggi, A. Bello, C. Oro, G. Sartori, L. Soldi, Tetrahedron 2008, 64, 1435-1439.
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I species based on the theoretical number of native acidic sites of the corresponding H-zeolite. For recent methods of determination of Brønsted acid sites on zeolites, see: B. Louis, S. Walspurger, J. Sommer, Catal. Lett. 2004, 93, 81-84;
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I species based on the theoretical number of native acidic sites of the corresponding H-zeolite. For recent methods of determination of Brønsted acid sites on zeolites, see: B. Louis, S. Walspurger, J. Sommer, Catal. Lett. 2004, 93, 81-84;
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44
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53849083989
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The catalyst was reactivated by calcination at 300°C in a stream of air for 1 h. With practical synthetic aspects in mind, the zeolite catalyst was also reused as such, without reactivation. In this case, a slow but regular decrease in efficiency was observed (see Figure). It is known that deactivation occurred by coke slowly building up in the zeolite pores. (Graph Presented)
-
The catalyst was reactivated by calcination at 300°C in a stream of air for 1 h. With practical synthetic aspects in mind, the zeolite catalyst was also reused as such, without reactivation. In this case, a slow but regular decrease in efficiency was observed (see Figure). It is known that deactivation occurred by coke slowly building up in the zeolite pores. (Graph Presented)
-
-
-
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45
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53849107332
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Applying the H/D titration method that we developed for the determination of acidic sites in zeolites[12] to H-USY treated with CuCl revealed that the H/Cu exchange process was not complete and ca. 20% of the acidic sites remained
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[12] to H-USY treated with CuCl revealed that the H/Cu exchange process was not complete and ca. 20% of the acidic sites remained.
-
-
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46
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27744439026
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Such a coordination/deprotonation/acetylide formation sequence has been demonstrated for silver ions, see: U. Halbes-Letinois, P. Pale, S. Berger, J. Org. Chem. 2005, 70, 9185-9190
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Such a coordination/deprotonation/acetylide formation sequence has been demonstrated for silver ions, see: U. Halbes-Letinois, P. Pale, S. Berger, J. Org. Chem. 2005, 70, 9185-9190.
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