5699-45-6

Upstream product

• 3077-71-2 8-hydroperoxy-p-cymene 
• 99-87-6 4-methylisopropylbenzene 
• 1849-36-1 para-nitrobenzenethiol 

Downstream Products

• 122-03-2 (4-isopropylbenzaldehyde) 
• 3077-71-2 8-hydroperoxy-p-cymene 

Relevant academic research and scientific papers

Nanosized ruthenium particles decorated carbon nanofibers as active catalysts for the oxidation of p-cymene by molecular oxygen

Highly dispersed, nanosized ruthenium (Ru) particles anchored on carbon nanofibers (CNFs) with varying Ru loadings (1-7 wt.%) showed effective catalytic activity in the aerobic oxidation of p-cymene using molecular oxygen. The activity of the Ru catalysts was influenced by the structural properties that resulted from the different metal loadings and by various reaction variables, such as the temperature, the amount of catalyst and the type of radical-initiator substrate. Under optimized reaction conditions, the 3%Ru/CNF catalyst exhibited excellent performance with a selectivity of 42% toward primary cymene hydroperoxide (PCHP) and 33% toward tertiary cymene hydroperoxide (TCHP) at 55% p-cymene conversion achieved within 5 h at 90 °C. The results demonstrated that the direct participation of the catalyst in p-cymene CH bond activation occurred via catalytic decomposition of tertiary-butyl hydroperoxide (TBHP), which was added as an initiator, into a free-radical chain initiator rather than the direct H-atom abstraction by the catalyst itself. The catalytic efficacy displayed by the Ru/CNF catalysts provides encouraging results for the activation of CH bonds of liquid-phase alkyl aromatic hydrocarbons, such as p-cymene, toward the introduction of an oxygen atom. The catalyst was reusable for five consecutive reaction cycles without appreciable loss of activity. Moreover, Ru/CNF catalyst was active for extended substrate scope application in the oxidation of other alkyl-substituted aromatics.

Liquid Phase Oxidation of p-cymene by (VO)2P2O 7 and VO(PO3)2 Catalysts

Vanadium phosphate oxide (VPO) catalysts derived from VOHPO 4?0.5H2O and VO(H2PO4) 2 precursors showed improved rates in the catalysed liquid phase oxidation of p-cymene. Both catalysts showed high performance with conversions of up to 30% achieved within 3 h with a selectivity towards the tertiary cymene hydroperoxide (TCHP) of 75-80% when compared to lower conversions and poorer TCHP selectivity in the non-catalysed industrial oxidation processes that takes about 8-12 h reaction time. The temperature dependent structural changes during activation within the catalysts were studied by in situ XRD and TGA-MS. The in situ XRD showed that the VO(H2PO4)2 form mainly an amorphous phase at temperature up to 600 °C while above 650-750 °C a stable VO(PO3)2 phase was obtained. The in situ XRD studies of the (VO)2P2O7 phase derived from VOHPO4?0.5H2O showed to became more crystalline with increasing temperature from 400 to 750 °C. No formation of VOPO4 phases were observed in the activated (VO)2P2O7 catalyst even at high temperature under the in situ XRD conditions. Graphical Abstract: VPO catalysts derived from VOHPO4?0.5H2O and VO(H2PO4)2 precursors improve oxidation rates and improved tert-cymene hydroperoxide selectivity during the liquid-phase oxidation of p-cymene compared to non-catalyzed oxidations. [Figure not available: see fulltext.]

CERIUM (IV) AMMONIUM NITRATE CATALYSED PHOTOCHEMICAL AUTOXIDATION OF ALKYLBENZENES

The autoxidation of alkylbenzenes can be promoted photochemically in the presence of catalytic amounts of cerium (IV) ammonium nitrate (CAN) under very mild conditions, the efficiency of the process being significantly increased by added acids.It is suggested that the reaction is promoted by NO3 radicals formed in the light induced decomposition of CAN and that Ce(III) may be reoxidized to Ce(IV) by benzylperoxy radicals.

Process for preparation of phenols

A process for producing phenols which comprises oxidizing an aromatic hydrocarbon ring-substituted by an isopropyl group in one step in the liquid phase using molecular oxygen or a gas containing molecular oxygen in the presence or absence of a solvent, wherein the oxidation is carried out in the presence of an aromatic mercaptan having an acid dissociation constant (pKa) of less than 7.8.