16832-59-0Relevant articles and documents
Fully meta-Substituted 4,4′-Biphenyldicarboxylate-Based Metal–Organic Frameworks: Synthesis, Structures, and Catalytic Activities
Li, Jiawei,Ren, Yanwei,Qi, Chaorong,Jiang, Huanfeng
, p. 1478 - 1487 (2017/03/31)
Fully meta-substituted 2,2′,6,6′-tetramethoxy-4,4′-biphenyldicarboxylic acid (H2L) was synthesized and applied in the construction of three metal–organic frameworks (MOFs), {[Cu3L3(H2O)2(DMF)]n (1), [Zn4OL3]n (2), and [Zn4OL3(H2O)(DEF)]n (3)}. For 1, the approximately vertical twist of two benzene rings in L leads to the formation of a twofold-interpenetrated 3D structure with 1D open channels (11 × 15 ?). MOFs 2 and 3 have classical twofold-interpenetrated isoreticular MOF structures, and reversible transformation of the oxozinc carboxylate clusters of 2 and 3 could be realized via a solvent-exchange-induced single-crystal-to-single-crystal pathway, which provides direct structural evidence for a Zn4O core as Lewis acidic site in MOFs. Desolvated framework 1′ exhibits high permanent porosity (Langmuir surface area = 555 m2/g), high thermal stability (up to 300 °C), and highly active catalytic properties for cyanosilylation and olefin epoxidation. MOF 2 exhibits moderate carbon dioxide uptake ability and can efficiently catalyze the cycloaddition of CO2 with epoxides under mild conditions.
Effect of Anions on the Epoxidation of Styrenes with H2O2 in the presence of Ammonium Heptamolybdate(VI)-Dioctyltin Oxide catalysts
Inoue, Masami,Nakayama, Eiichi,Nakamura, Yuuko,Rengakuji, Seichi,Nishibe, Keiichi
, p. 3442 - 3444 (2007/10/02)
The epoxidation of styrene, α-methylstyrene, β-methylstyrene, p-chlorostyrene, and m-divinylbenzene with H2O2 in the presence of ammonium heptamolybdate(VI)-dioctyltin oxide catalysts in CHCl3-H2O was studied.The addition of neutral salts, such as NaNO3 or Na2SO4, to the catalyst system prevented the successive hydration of styrene oxide once formed.The presence of KCl or NaCl almost suppressed the oxidation, while no substantial effect was observed in NaClO4.The various effects of these anions were realted to the results concerning the coordination of anions to Mo(VI)-ions.
