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Titolo:
Dendrimeric organochalcogen catalysts for the activation of hydrogen peroxide: Improved catalytic activity through statistical effects and cooperativity in successive generations
Autore:
Francavilla, C; Drake, MD; Bright, FV; Detty, MR;
Indirizzi:
SUNY Buffalo, Dept Chem, Buffalo, NY 14260 USA SUNY Buffalo Buffalo NY USA 14260 ffalo, Dept Chem, Buffalo, NY 14260 USA SUNY Buffalo, Dept Med Chem, Buffalo, NY 14260 USA SUNY Buffalo Buffalo NY USA 14260 o, Dept Med Chem, Buffalo, NY 14260 USA
Titolo Testata:
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
fascicolo: 1, volume: 123, anno: 2001,
pagine: 57 - 67
SICI:
0002-7863(20010110)123:1<57:DOCFTA>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGHLY ENANTIOSELECTIVE EPOXIDATION; VANADIUM BROMOPEROXIDASE; ORGANOTELLURIUM(II) COMPOUNDS; DENDRITIC MACROMOLECULES; MOLECULAR ARCHITECTURE; DIORGANYL TELLURIDES; CONVERGENT APPROACH; STEPWISE MECHANISM; OXIDATIVE ADDITION; THIOL PEROXIDASE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Detty, MR SUNY Buffalo, Dept Chem, Buffalo, NY 14260 USA SUNY Buffalo Buffalo NY USA 14260 t Chem, Buffalo, NY 14260 USA
Citazione:
C. Francavilla et al., "Dendrimeric organochalcogen catalysts for the activation of hydrogen peroxide: Improved catalytic activity through statistical effects and cooperativity in successive generations", J AM CHEM S, 123(1), 2001, pp. 57-67

Abstract

Dendrimeric polyphenylsulfides, -selenides, and -tellurides are prepared in high yield using propyloxy spacers to connect the phenylchalcogeno groupsto the dendrimeric core. The selenides and tellurides catalyze the oxidation of bromide with hydrogen peroxide to give positive bromine species that can be captured by cyclohexene in two-phase systems. The corresponding sulfides show no catalytic activity. The increase in the rate of catalysis followed statistical effects for 1, 6, and 12 phenyltelluro groups. However, the increase in the rate of catalysis exceeds statistical contributions for the first few generations with 1, 3, 6, and 12 phenylseleno groups and suggested cooperativity among phenylseleno groups. The increase in catalytic rate was lost upon replacing all but one phenylseleno group with phenoxy groups. On the basis of H2O2 consumed, the dendrimer with 12 phenylseleno groupshas a turnover number of >60 000 mol of H2O2 consumed per mole of catalyst.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 06:09:00