Question

Why ethyl 2 anthraquinone is having high selectivity in the production of hydrogen peroxide?

Answer 1

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Anthraquinone hydrogenation belongs to a rapidly developing area in catalysis studies, an interest to which is motivated by the necessity of solving a num- ber of theoretical and practical problems [1][2][3]. The discovery of the methods of consecutive hydrogena- tion and oxidation of alkylanthraquinones (2-ethyl-, 2-tert-butyl-, and 2-pentylanthraquinones): ...

... Earlier the methods of IR and NMR spectroscopy were used to show that organoaluminum compounds (AlEt 2 (acac) and AlEt 3 ) are capable of stabilizing transition metal nanoclusters (Pd [12], Ni [13], Ir [14]). The aggregation of nanoparticles as a result of alcoholysis of organoaluminum compounds points to the low stabilizing ability of alkoxy deriva- tives of aluminum Al(OR) 3 . Although the kinetic curves of 2-ethyl-9,10-anthraquinone hydrogenation catalyzed by Ziegler catalysts at different AlEt 3 /Pd ratios generally look similar to those obtained in the presence of palladium black (Fig. 1), the catalytic sys- tems Pd(acac) 2 -nAlEt 3 differ from palladium black in activity and selectivity in 2-ethyl-9,10-anthraquinone hydrogenation. ...

... In our opinion, the predominant formation of Н 4 eA- QН 2 compared to iso-H 4 eAQН 2 is due, to the steric factor. The high yield of Н 4 eAQН 2 (21.7%) was also observed in the preparation of the Pd(acac) 2 -4AlEt 3 catalytic system in the presence of Sibunit carbon sup- port. The hydrogenation of eAQН 2 to Н 4 eAQН 2 , the fraction of which based on the initial substrate was 10.4%, was observed when palladium diacetate (Pd(OAc) 2 , AlEt 3 /Pd = 4) was used as a precursor. ...