Effects of a Matrix on Formation of Aromatic Compounds by Dehydrocyclization of -Pentane Using ZnZSM-5-AlO Composite Catalysts.

In this study, the effects of the combination of a mesoporous material and Zn-exchanged ZSM-5 on the activity and selectivity of aromatic compounds in dehydrocyclization of -pentane were investigated. A total of 65-85 wt % of ZnZSM-5 was mixed with 0-20 wt % of AlO and 15 wt % of the alumina-sol binder using a conventional kneading method. Dehydrocyclization of -pentane was performed using a fixed-bed reactor under the conditions of a H atmosphere and the temperature range of 450-550 °C.

Effect of heat-treatment on the pH sensitivity of stainless-steel electrodes as pH sensors.

Effect of heat-treatment on the pH sensitivity of uncoated stainless-steel electrodes was investigated to comprehend the pH sensitivity of metal-oxide coated stainless-steel electrodes as novel pH sensors. The pH sensitivity of stainless-steel electrodes as-received and heat-treated at 500 °C, 600 °C and 700 °C for 24 h were 91 %, 94 %, 102 % and 91 %, respectively. The pH sensitivity tended to increase with increasing heat-treatment time at a given temperature.

Drastic Dependence of the pH Sensitivity of Fe₂O₃-Bi₂O₃-B₂O₃ Hydrophobic Glasses with Composition.

Fe₂O₃-Bi₂O₃-B₂O₃ (FeBiB) glasses were developed as novel pH responsive hydrophobic glasses. The influence of the glass composition on the pH sensitivity of FeBiB glasses was investigated. The pH sensitivity drastically decreased with decreasing B₂O₃ content.

Asymmetric construction of three contiguous stereogenic centers by conjugate addition-alkylation of lithium ester enolate.

A chiral ligand- and lithium amide-assisted asymmetric conjugate addition of lithium enolate of propionate to cyclopentenecarboxylate gave the corresponding lithium enolate, whose allylation gave the key intermediate of the marine alkaloid halichlorine as a single diastereomer with moderate enantioselectivity.