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• W2148889592 endingPage "1920" @default.
• W2148889592 startingPage "1915" @default.
• W2148889592 abstract "The oxidative coupling of 2-naphtol to 2,2′-dihydroxy-1,1′-binaphthyl (binaphthol) by air or oxygen has been carried out in the presence of Cu2+- and Fe3+-doped MCM-41 aluminosilicate as catalyst. Fe-exchanged MCM-41 was found to be a very efficient catalyst; excellent mass balances (> 95%) with almost total conversion and selectivity to binaphthol were achieved. The same reaction has also been carried out on Cu2+– and Fe3+–Y zeolites. Taking into account the relative dimensions of binaphthol and the catalyst pores, molecular modeling predicts that binaphthol can be accommodated inside the zeolite Y supercages (1.3 nm), but it cannot diffuse outside the zeolite cavities through the smaller pore apertures (0.74 nm). This prediction has been confirmed by dissolving a Y zeolite after the reaction, whereby unextractable binaphthol entrapped within the cavities was recovered. Variable amounts of two secondary by-products have also been detected, and their structure assigned to (2,8′);(8,2′)-dioxo-1,1′-binaphthyl and bisnaphthofuran based on analytical and spectroscopic data. Their percentage is particularly high when alumina-supported CuSO4 is used as the catalyst." @default.
• W2148889592 created "2016-06-24" @default.
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• W2148889592 date "1999-08-01" @default.
• W2148889592 modified "2023-10-14" @default.
• W2148889592 title "A Highly Selective Synthesis of 1,1′-Bi-2-naphthol by Oxidative Coupling of Naphthol on Mesoporous Fe,Cu/MCM-41 Aluminosilicates" @default.
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• W2148889592 doi "https://doi.org/10.1002/(sici)1099-0690(199908)1999:8<1915::aid-ejoc1915>3.0.co;2-1" @default.
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