Ru3(CO)12 catalyzes the reductive carbonylation of ortho-nitrophenylazo compounds to give the corresponding benzotriazoles, in ortho-dichlorobenzene or ortho-xylene, at 180-200 °C and 70-80 atm, although with rather low conversion and selectivity. Both conversion and selectivity are markedly increased by addition of a base such as Et3N, which acts, under our conditions, as a deoxygenating agent of the nitro group. The mechanism of the reaction has been investigated by studying the possible intermediates.
Useful synthesis of benzotriazole photostabilizers by reductive carbonylation of ortho-nitrophenylazo compounds, catalyzed by Ru3(CO)12 in the presence of NEt3 / M. Pizzotti, S. Cenini, R. Psaro, S. Costanzi. - In: JOURNAL OF MOLECULAR CATALYSIS. - ISSN 0304-5102. - 63:3(1990), pp. 299-304.
Useful synthesis of benzotriazole photostabilizers by reductive carbonylation of ortho-nitrophenylazo compounds, catalyzed by Ru3(CO)12 in the presence of NEt3
M. PizzottiPrimo
;S. CeniniSecondo
;R. PsaroPenultimo
;
1990
Abstract
Ru3(CO)12 catalyzes the reductive carbonylation of ortho-nitrophenylazo compounds to give the corresponding benzotriazoles, in ortho-dichlorobenzene or ortho-xylene, at 180-200 °C and 70-80 atm, although with rather low conversion and selectivity. Both conversion and selectivity are markedly increased by addition of a base such as Et3N, which acts, under our conditions, as a deoxygenating agent of the nitro group. The mechanism of the reaction has been investigated by studying the possible intermediates.
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