Partial hydrogenation of benzene to cyclohexene in a continuously operated slurry reactor

Mechanistic Insights into the Conversion of Cyclohexene to Adipic Acid by H2O2 in the Presence of a TAPO‐5 Catalyst

“…Research into alternative, more benign methods of producing 2 is therefore called for; and we have previously reported how appropriately designed Co III ‐ or Mn III ‐containing microporous aluminophosphate catalysts offer a means of yielding 2 in air, in a solvent‐free fashion either from cyclohexane3 or from n ‐hexane 4. Since cyclohexene ( 1 ) is nowadays readily produced by catalytic partial hydrogenation of benzene,5, 6 there is interest in using aqueous H 2 O 2 as an oxidant7–10 to produce 2 and 4 with the aid of a suitable catalyst. Sato et al11 used a peroxytungstate (Na 2 WO 4 ) in the presence of a phase‐transfer catalyst (CH 3 ( n ‐C 8 H 17 )HSO 4 ) to convert 1 to 2 ; and Deng et al,12 employing a similar overall approach, replaced the harmful phase‐transfer catalyst with a peroxytungstate–organic complex prepared in situ (such as [W(O)(O 2 )L 2 ] 2− , where L 2 is an organic acid with multifunctional groups).…”

Mechanistic Insights into the Conversion of Cyclohexene to Adipic Acid by H2O2 in the Presence of a TAPO‐5 Catalyst

“…Research into alternative, more benign methods of producing 2 is therefore called for; and we have previously reported how appropriately designed Co III -or Mn III -containing microporous aluminophosphate catalysts offer a means of yielding 2 in air, in a solvent-free fashion either from cyclohexane [3] or from n-hexane. [4] Since cyclohexene (1) is nowadays readily produced by catalytic partial hydrogenation of benzene, [5,6] there is interest in using aqueous H 2 O 2 as an oxidant [7][8][9][10] to produce 2 and 4 with the aid of a suitable catalyst. Sato et al [11] used a peroxytungstate (Na 2 WO 4 ) in the presence of a phase-transfer catalyst (CH 3 (n-C 8 H 17 )HSO 4 ) to convert 1 to 2; and Deng et al, [12] employing a similar overall approach, replaced the harmful phase-transfer catalyst with a peroxytungstate-organic complex prepared in situ (such as…”

Selective Hydrogenation of Multiple Unsaturated Compounds

“…For example, Dobert [71] and Gescheidle [73] could show that the presence of a non aqueous phase is not crucial to reach a high selectivity. For example, Dobert [71] and Gescheidle [73] could show that the presence of a non aqueous phase is not crucial to reach a high selectivity.…”