Reference

Thermodynamics of the anionic equilibrium polymerization of a-methylstyrene

Thermodynamics of the anionic equilibrium polymerization of a-methylstyrene. Guo, Shaohua; Ying, Shengkang (East China Inst. Chem. Technol., Shanghai, Peop. Rep. China). Gaodeng Xuexiao Huaxue Xuebao, 7(6), 549-53 (Chinese) 1986. CODEN: KTHPDM. ISSN: 0251-0790. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) The equil. concn. of a-methylstyrene [98-83-9] in polymn. was dependent on temp. and BuLi [109-72-8] concn. A math. expression relating concn. of monomer and catalyst was given. The equil. rate consts., free energies, heat of polymn., and entropy of polymn. of monomer and assocd. reactive species were reported.

Oxidative dehydrogenation of alkylaromates in the presence of molybdenum trioxide/magnesium oxide catalysts doped with alkali metals

Oxidative dehydrogenation of alkylaromates in the presence of molybdenum trioxide/magnesium oxide catalysts doped with alkali metals. Oganowski, Waldemar (Inst. Chem. Org., Pol. Akad. Nauk, Wroclaw, Pol.). Chem. Stosow., 29(3-4), 289-98 (Polish) 1985. CODEN: CHSWAP. ISSN: 0376-0898. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 45 The effect of the Mo concn. and of the alkali metal (M) dopant on the activity and selectivity of MoO3/MgO catalysts in oxidative dehydrogenation of alkylaromates was studied for Mo content 1-10%. Values of the Mo/M at. ratio were 0.75 or 2 for Li, 1.38 or 2 for Na, 2.15 or 2 for K, 2.4 for Rb, and 3.14 for Cs when the catalyst contained 5% Mo or they were equal to 0.5 or 1 for any alkali metal added to the catalyst contg. 2.5% Mo. To test the doped catalysts, oxidative dehydrogenation of a 75% diethylbenzene [25340-17-4] fraction, PhEt [100-41-4], cumene [98-82-8] and p-cymene [99-87-6] was performed at 769-778°K and at substrate-0 mol ratio 1:1. When p-cymene was oxidized to p-isopropenyltoluene [1195-32-0], no effect of the presence of M in the catalyst on its activity and selectivity was obsd. A decrease of the catalyst activity and increased selectivity was found for all alkali metals except Cs tested in the dehydrogenation of diethylbenzene to divinylbenzene [1321-74-0] and ethylstyrene [28106-30-1], of PhEt to styrene [100-42-5], and of cumene to a-methylstyrene [98-83-9].