Wo Propyl benzene

The principal process in use is the peroxidation of cumene (wo-propyl benzene) at 130°C in the presence of air and a catalyst followed by decomposition of the peroxide at 55 to 65°C in the presence of sulfuric acid. 

Catalytic activity of the external surface was evaluated applying cracking of tri-wo-propyl benzene (TIPS) at 570 K in a flow reactor with 1.0 vol.% of the substrate in No and a WHSV of l.Oh-V... 

Figure 6. Conversion of tri-wo-propyl benzene over samples activated at 623 K after 15 min and 55 min time on stream.

It is shown that tert-butyl ester 3-(3, 5 -fert.butyl-4 -hydroxyphenyl)-propionic acid possesses anomalously high antioxidative efficacy in radical reaction in the conditions of the initiated oxidation of wo-propyl benzene with an inhibition constant = 3 x 10 1-mol -s and number of stopping of chain f = 5. On the basis of results of quantum-chemical calculations enthalpies H°), entropies S°) and energy of a cleavage of communications OH-bond of tert.butyl and methyl ester 3-(3, 5 -di-tert. butyl-4 -hydroxyphenyl)-propionic acid are calculated energy of formation (-E°). 

The inflammable solvents most frequently used for reaction media, extraction or recrystallisation are diethyl ether, petroleum ether (b.p. 40-60° and higher ranges), carbon disulphide, acetone, methyl and ethyl alcohols, di-wo-propyl ether, benzene, and toluene. Special precautions must be taken in handling these (and other equivalent) solvents if the danger of fire is to be more or less completely eliminated. It is advisable to have, if possible, a spedal bench in the laboratory devoted entirely to the recovery or distillation of these solvents no flames are permitted on this bench. 

While the diazonium salt route is probably the most commonly used laboratory synthesis of phenols, phenol itself is manufactured from wo-propylbenzene, which has the common name cumene. Cumene is prepared by a Friedel-Crafts reaction between propene and benzene, in the presence of a strong acid such as H3PO4 (Figure 13.28). The key intermediate is the 2-propyl cation, formed by protonation of propene. 

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