Showing papers in "Journal of Molecular Catalysis in 1978"

TL;DR: In this article, the activation of an amine porous silica with glutaraldehyde has been studied and compared with the capacity of the activated silica to bind trypsin, based on a reaction mechanism with a polymeric form resulting from aldol condensation.

TL;DR: In this article, an experimental study was carried out on the addition of alcohols to tertiary olefins catalyzed by a macroporous sulfonic acid resin, and the experimental data agreed with an ionic mechanism wherein the protonation of the olefin by the solvated proton is the rate determining step.

TL;DR: The formation of rhodium carbonyl complexes within zeolite cavities has been studied in this article, where the reactivity of these Rh(III) ions has been investigated by i.r.c.a. and e.g. techniques.

TL;DR: In this article, rhodium carbonyl clusters have been entrapped in NaY zeolites, and the resulting product proved to be very active as a catalyst for the liquid phase hydroformylation of olefins, showing a high selectivity to the formation of aldehydes, and a normal-: iso-aldehyde ratio similar to that shown by rhodia carbonyls in homogeneous catalysis.

TL;DR: In this article, a method of calculating cluster structures based on the CNDO/BW method is proposed, which allows the inclusion of up to five atoms in the calculation simultaneously; the parameters of these atoms may be varied.

TL;DR: In this paper, it is proposed that ferritin iron oxidation and deposition involves four steps: fixation of Fe 2+ by catalytic sites on pairs of adjacent polypeptide chains, fixation of a dioxygen molecule between the iron atoms, reduction of the diooxygen to give a peroxo-complex in which the oxygen ligand is coordinated to two iron atoms.

TL;DR: In this article, the shape of the potential curves of surface groups on modified porous glass and NaHY zeolyte was reconstructed from overtone infrared data, and the barriers for the proton transfer were calculated from these data.

TL;DR: In this paper, the state of Ti(III) ions in ethylene polymerization catalysts prepared by interaction of Ti (CH 2 C 6 H 5 ) 4 with SiO 2 was studied by the ESR technique.

TL;DR: The addition of a small amount of a di- or tritertiaryphosphine to a solution of [RhH(CO) (PPh3)3] in benzene enhances the hydroformylation activity and selectivity of the system, but addition of an amount exceeding equimolar reduces the activity.

TL;DR: In this paper, the 1-octene catalysed by [η 5 -C 5 H 5 M(CO) 2 ] 2 (MFe,Ru) has been studied under 100 atm of a one to one H 2 -CO mixture in the temperature range 120 − 175°C.

TL;DR: Rhodium complexes with chiral chelating bis aminophosphines catalyze the asymmetric hydrogenation of prochiral olefinic precursors of α-aminoacids with good stereoselectivity as mentioned in this paper.

TL;DR: In this paper, transition metal complexes with polyconjugated organic compounds were synthesized using an analogy with the mechanism of hydrogenase action, and these catalysts were shown to convert the non-complementary process into the complementary.

TL;DR: In this paper, the presence of zerovalent precursor complexes of tungsten (W(CO) 5 L) with the surface of η alumina has been investigated.

TL;DR: In this paper, a theory for constructing electrocatalysts based on immobilized enzymes is described, and the macrokinetics of electrocatalysis with enzymes anchored to equiaccessible surface electrodes are derived.

TL;DR: In this article, a rule is presented which predicts the screw sense of polymers obtained in a nickel-catalyzed reaction from chiral isocyanides of the type R 1 R 2 R 3 CNC.

TL;DR: In this paper, the influence of the nature and the position of substituents on the product distribution is clearly shown, and correlations between selectivity and regioselectivity of the reaction and electronic and steric factors of the substitusents, are given.

TL;DR: In this article, a merry-go-round sequence of ligand/insertions was proposed for the polymerization of isocyanides by nickel(II) and the mechanism agreed with kinetic results as well as with data on the reactivity of coordinated isocenes and on substitution at nickel (II).

TL;DR: In this article, the most stable geometrical packing of each Lin cluster (2 ≤ n ≥ 9) suggests a sequence for the growth of very small lithium aggregates, up to Li9.

TL;DR: In this paper, the conversion of neopentane has been studied on Pt/SiO 2, Pt + W/Si O 2 and Pt + Mo/Si 2 catalysts, and the bimetallic samples exhibit a decreased selectivity towards isomerization but increased activity toward hydrogenolysis.

TL;DR: In this paper, a new scheme is proposed to explain the homogeneous hydrogenation of cyclohexene in benzene using Rh(PO3)3Cl as catalyst, where Rh( PO3)2H2Cl is the main active species.

TL;DR: In this paper, an organic quinone polymers containing sulphonic acid functional groups, combined with palladium ion, gave heterogeneous oxidation catalysts which are effective for the selective oxidation of ethylene to acetaldehyde.

TL;DR: In this article, l'etude effectuee sur la cyclodimerisation en phase homogene du butadiene and de l'isoprene a permis de decouvrir de nouveaux couples “[Fe(NO) 2- Cl] 2 + reducteur” precurseurs d'une entite insaturee a base de fer, a 14 electrons, rendant cette reaction catalytique, selective and quantitative.

TL;DR: In this article, a mechanism of the oxidizing dehydrogenation process converting ethylbenzene to styrene on molybdate catalysts is suggested, and the nature of Mo(V)/Mo(VI) active centers and the structure of Mo (V)-containing ions are discussed.

TL;DR: In this article, a micelle-forming neutral surfactant was added to the K 3 [Co(CN) 5 H] catalyzed hydrogenation of 2- methylbutadiene, 2,3-dimethylbutadienes, and trans -1, 3-pentadiene in aqueous solution.