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It can be concluded that with H-Y zeolites, the presence of water (which is generated in situ durin enol benzoylation tests) has a pronounced slowing effect on the rate of consecutive PB transformatio to HPBs, thus explaining the lower selectivity to HBPs recorded with these catalysts. It is possibl on the rate of consecutive PB transformation into HPBs, thus explaining the lower at Lewis acisdelseictteisv,itwy htoicHhBpPlsayrecaonrdimedpworitahntthreoselecaintatlyhsetsr.eIatcitsiopnosmsibelcehtahnaitsLmewisitahciHd-sbitetsa,, are strongl hibited by the presence of water. which play an important role in the reaction mechanism with H-beta, are strongly inhibited by the presence of water. When we carried out the benzoylation of phenol with benzoic anhydride, a reaction that does not lea When we carried out the benzoylation of phenol with benzoic anhydride, a the co-production of water, we obtained a greater phenol conversion, which is an expected resul reaction that does not lead to the co-production of water, we obtained a greater phenol cause BA (tchoenvceor-spiorno,dwuchticihnisbeanzeoxypleactieodnrewsuitlht, becnazuosiecBaAnh(tyhderciod-ep)roisduacmt inorbeenezffoiycliaetniotnleaving grou an water (the co-product in benzoylation with BA). However, despite the greater phenol conversio with benzoic anhydride) is a more efficient leaving group than water (the co-product in benzoylation with BA). However, despite the greater phenol conversion achieved, hieved, the selectivity to HBPs still remained low (Figure 7); this indicates that the difference observe the selectivity to HBPs still remained low (Figure 7); this indicates that the difference tween H-beta and H-Y zeolites in phenol benzoylation with BA was not due to water and to i observed between H-beta and H-Y zeolites in phenol benzoylation with BA was not teraction widthueLteowwisataecriadnsditteosi.ts interaction with Lewis acid sites. Figure 7. Effect of the benzoic anhydride/Ph molar ratio on phenol (Ph) Figure 7. Effect of the benzoic anhydride/Ph molar ratio on phenol (Ph) conversion and conversion and selectivity to phenylbenzoate (PB) and hydroxybenzophenones selectivity to phenylbenzoate (PB) and hydroxybenz◦ophenones (HBPs). Catalyst: HY-7, (HBPs). Catalyst: HY-7, reaction time 4 h, T = 190 C. reaction time 4 h, T = 190 °C. Excellent performances in the benzoylation of phenol with benzoic anhydride Excellent pweerrfeormepaonrcteds biyn Ctheaubeneztoayl.la[1t9io] nwiothf tphheeunsoel owf aitnh Hb-ebneztaoizceoalnithe;ytdhreidaeutwhoerse reported b observed a p-/o-HBP selectivity ratio close to two, similar to that one also observed haube et al. [19] with the use of an H-beta zeolite; the authors observed a p-/o-HBP selectivity rati in our experiments with HY-7. However, a selectivity to HBPs as high as almost ose to two, similar to that one also observed in our experiments with HY-7. However, a selectivity t 70% at over 95% benzoic anhydride conversion could be obtained with the H-beta. BPs as high as almost 70% at over 95% benzoic anhydride conversion could be obtained with th Hoefnagel and Van Bekkum studied the acylation of resorcinol with benzoic acid, -beta.HoefnwaigthelHa-nbdetVaianpB-cehklokruomtolusteundeiesodlvthenet;aacy7l0a%tioynielodftroe2s,o4r-cdinhoydlrwoxityhbbeneznozpohicenaocnide,withH-bet p-chlorotoluene solvent; a 70% yield to 2,4-dihydroxybenzophenone was reported, with 20% residu sorcinol monobenzoate [104]. Indeed, the better performance of H-beta in acylation of phenolics 130 ith H-Y zeolites [2]. Overall, we can state that despite both the large number of papers reporting on the use of zeolit was reported, with 20% residual resorcinol monobenzoate [104]. Indeed, the better ell known and widely described in the literature, for example in the acylation of anisole with aceti hydride (a process developed by Rhodia); however, acylation of veratrole is preferably carried o h n h n o e h c et n l H H na ei w nu w ePDF Image | Zeolite Catalysis
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