Abstract
2,5-Dihydroxy-3,6-di-tert-butyl-p-benzoquinone (QtBuDiol) reacts with Ph3SbBr2 in toluene in the presence of triethylamine to yield the ionic complex [Et3NH]+[(DionetBuDiolate)SbPh3Br]– (I). The same reaction in methanol leads to complete displacement of bromide ions from the antimony coordination sphere and gives triphenylantimony(V) 1,2-diolate (DionetBuDiolate)SbPh3 · MeOH (II · MeOH). The molecular structure of the complexes was determined by X-ray diffraction (CIF files CCDC no. 1960681 (I · toluene) and 1960682 (II · 2MeOH)). Both complexes are characterized by quinoid bond distribution in the six-membered carbon rings and by C=O double bonds in the Ph3SbO2C6(t-Bu)2O2 moieties. Formally, the complexes can be considered as 3,6-di-tert-butyl-o-benzoquinone derivatives with the organometallic Ph3SbO2 group in positions 4 and 5 of the quinone ring. The electrochemical reduction of II · MeOH in dichloromethane occurs at E1/2 = –1.52 V, which is significantly shifted to the cathodic region relative to the data for 3,6-di-tert-butyl-o-benzoquinone (E1/2 = –0.51 V). This redox potential shift indicates a significant decrease in the electron-withdrawing properties of the o-quinoid moiety, which is caused by the effect of the electron-donating catecholate metallacycle.
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ACKNOWLEDGMENTS
The spectroscopic and X-ray diffraction studies were carried out using the equipment of the Center for Collective Use of the Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences.
Funding
This work was carried out within the State Assignment of the Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences.
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The authors congratulate Academician I.L. Eremenko with a 70th birthday
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Okhlopkova, L.S., Poddel’sky, A.I., Smolyaninov, I.V. et al. Triphenylantimony(V) Catecholates Based on 3,6-Di-tert-Butyl-2,5-Dihydroxy-1,4-Benzoquinone. Russ J Coord Chem 46, 386–393 (2020). https://doi.org/10.1134/S107032842005005X
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DOI: https://doi.org/10.1134/S107032842005005X