58802-03-2Relevant academic research and scientific papers
Hydrogenation of Condensed Aromatic Compounds over Mesoporous Bifunctional Catalysts Following a Diels-Alder Adduct Pathway
Huyen, Pham Thanh,Krivec, Marko,Ko?evar, Marijan,Bucur, Ioana C.,Rizescu, Cristina,Parvulescu, Vasile I.
, p. 1146 - 1156 (2016/04/05)
Pt(0.5 wt %)-Al-SBA-15 and Pt(0.5 wt %)-Al-MCM-41 bifunctional catalysts were prepared by wet impregnation and investigated in the hydrogenation of anthracene and the hydrogenolysis/hydrogenation of a series of synthesized Diels-Alder adducts with anthracene and anthracene derivatives. The mesoporous texture of the investigated catalysts allowed the hydrogenation of these substrates to a large extent. In direct correlation with the size of the Pt particles, Pt-Al-SBA-15 exhibited a higher activity. Both catalysts exhibited a strong Lewis acidity associated with the presence of the Al extra-framework species. The acidity of these catalysts afforded the esterification of the reaction byproduct, that is, succinic anhydride, with methanol or ethanol, and the hydrocracking/decyclization of one hydrogenated ring to lead to 1,2,3,4-tetrahydronaphthalene derivatives. A good correlation with the calculated values of the reaction Gibbs free energy has been evidenced.
Comparison of shaking versus baking: Further understanding the energetics of a mechanochemical reaction
McKissic, Kelley S.,Caruso, Jeffery T.,Blair, Richard G.,Mack, James
, p. 1628 - 1632 (2014/03/21)
Using a mechanically driven Diels-Alder reaction we were able to characterize the chemical energetics of a SPEX 8000M mixer/mill. Our results demonstrate that the conditions produced by this type of mill are similar to those produced when performing the same reaction at 90 °C in solution. Discrete element models and in situ temperature logging were used to analyse the energetics of this system. These models indicate that the yields obtained using a SPEX 8000M mill are best correlated to the velocity of the media and number of non-zero force collisions.
CATALYTIC EFFECT OF GALLIUM CHLORIDE IN THE DIELS-ALDER REACTION BETWEEN MALEIC ANHYDRIDE AND ITS DERIVATIVES AND UNSUBSTITUTED AND SUBSTITUTED ANTHRACENES
Kiselev, V. D.,Shakirov, I. M.,Konovalov, A. I.
, p. 1105 - 1110 (2007/10/02)
The stability of n,v complexes between gallium chloride and unsubstituted and substituted maleic anhydrides was determined in benzene by a thermochemical method; it was shown that the stability of the complexes decreases in the transition from maleic anhydrides with electron-donating substituents to maleic anhydrides with electron-withdrawing substituents.The reactivity of these dienophiles in the uncatalyzed Diels-Alder reactions with unsubstituted and substituted anthracenes in benzene and in the reaction catalyzed by gallium chloride was studied.The reactivity of the dienophiles varies similarly in the reactions with the investigated dienes, and this rules out treatment of steric hindrances as the reason for the reduced reactivity of the substituted dienophiles.A decrease in the catalytic effect was observed for the unreactive diene-dienophile pairs.
A Kinetic Study of Reactions of Substituted Anthracenes with Maleic Anhydride
Mielert, Albrecht,Braig, Christa,Sauer, Juergen,Martelli, Jaques,Sustmann, Reiner
, p. 954 - 970 (2007/10/02)
Kinetic data for the Diels-Alder addition of 2-, 9- and 9,10-disubstituted anthracenes with maleic anhydride are interpreted in terms of FMO-theory.While the simplest form of FMO-theory does not give satisfactory results, inclusion of eigenvector coefficients at the reacting centers does provide an improvement.
