The stereoselective hydrogenation of 2-butyne-1,4-diol into cis-2-butene-1,4-diol was studied over palladium supported on metal–organic coordination polymers of different topology (methanol, 293 K, PH2 = 1 atm). 3D-metal–organic frameworks MOF-5 (Zn4O(BDC)3, BDC = benzene-1,4-dicarboxylate), I...

The semi-hydrogenation of 2-butyne-1,4-diol has been performed with supported Pd catalysts (0.2–0.3 wt% Pd) obtained from layered double hydroxides (LDH) precursors. The catalysts have been prepared by three different routes: (i) impregnation with Pd(acac)2 of a Mg(Al)O support (Pd/Mg(Al)O-imp)...

Hydrogenation experiments of 2-butyne-1,4-diol, catalysed by carbon-supported palladium, have been performed in a batch reactor using high pressurised carbon dioxide as reaction solvent. Carbon dioxide pressure was kept to a constant value of 18 MPa. The influence of the hydrogen pressure, varyi...

Synthesis of new phosphorus dendron containing 2-butyne-1,4-diol at the core is described. The divergent build-up of the dendron is based on simple condensation reactions performed by using P(O)Cl3, 3-hydroxybenzaldehyde, hydrazine hydrate, 4-hydroxybenzaldehyde and 2-mercaptoethanol. The final ...

The microwave-assisted partial hydrogenation of 2-butyne-1,4-diol, diphenylacetylene and phenylacetylene with novel lead-free Pd/Boehmite catalysts were investigated. Obtaining high alkyne conversion and good selectivity of the product alkenes required optimization of several reaction parameters...

A palladium-catalyzed protocol for effective synthesis of 1,3-oxazolidines has been reported. This method is featured by the high diastereoselectivity (dr up to >98/2) and using the readily available 2-butene-1,4-diol derivatives and imines as substrates.

Palladium catalysts on different supports (SiO2, Al2O3, TiO2, ZrO2, MgO and ZnO) have been tested in selective liquid phase conversion of cis-2-butene-1,4-diol affording also, when hydrogenated, 2-hydroxytetrahydrofuran. The metal particle size was determined by TEM. The acidic properties of the...

The liquid phase hydrogenation of cis-2-butene-1,4-diol has been studied in ethanol, using different platinum-supported catalysts, at a temperature ranging from 273 to 303 K and at a partial H2 pressure between 0.01 and 0.1 MPa. Formation of only hydrogenation and hydrogenolysis products was det...

The selective hydrogenation of 2-butyne-1,4 diol to cis-2-butene-1,4 diol has been studied using different palladium-supported catalysts. With 1% Pd/C catalyst, the major product formed was 1,4-butanediol, along with other side products such as butenediol, γ-hydroxy butyraldehyde, n-butyraldehy...

The effect of K, Ca and Ba metals addition on the catalytic properties of SiO2 supported ruthenium catalysts in the selective liquid phase conversion of cis-2-butene-1,4-diol affording, when hydrogenated, 2-hydroxytetrahydrofuran has been investigated. Catalysts containing 5 wt% Ru and promoted ...

Structured palladium catalysts suitable for three-phase reactions have been developed based on woven fabrics of active carbon fibres (ACF) as the catalytic supports. The Pd/ACF were tested in liquid-phase hydrogenation of 2-butyne-1,4-diol showing a selectivity towards 2-butene-1,4-diol up to 97...

Silica supported Group VIII metal catalysts (Pd, Pt, Ru, Rh and Ir) have been tested at 303 K in liquid-phase reaction of cis-2-butene-1,4-diol with hydrogen at atmospheric pressure. The catalysts have been characterized by TPR, XRD and TEM. The catalytic activity changes in the order: Pd ≫ Rh >...

Hydrogenation of 2-butyne-1,4-diol has been investigated over palladium supported catalysts. It was found that, besides butane-1,4-diol, side products such as cis- and trans-2-butene-1,4-diol, 2-hydroxytetrahydrofuran, cis- and trans-crotyl alcohol and n-butanol were also formed. The hydrogenati...

The adsorption structures of cis-2-butene-1,4-diol (C4H8O2) on a Si(100) surface were investigated using density functional theory (DFT) calculations. The most stable configuration involves the adsorbed cis-2-butene-1,4-diol molecule with dissociated H forming a bridged structure between two sur...

The individual and synergistic effects of coumarin and cis-2-butene-1,4-diol on the surface morphology and the crystal structure of Ni electrodeposits at a high cathodic current density were investigated using SEM, XRD, SIM and electrochemical analyses. While the rough Ni layer composed of spira...

A polemic is given regarding the calculated volumetric properties reported by Yue and coworkers for binary mixtures containing 1,4-butanediol and dimethyl sulfoxide. The calculated excess molar volumes reported by the authors for 293.15 K are not thermodynamically consistent with the calculated ...

Establishing novel synthetic routes for microbial production of chemicals often requires overcoming pathway bottlenecks by tailoring enzymes to enhance bio-catalysis or even achieve non-native catalysis. Diol dehydratases have been extensively studied for their interactions with C2 and C3 diols....

The development of bioenergy and biorefineries has generated new requirements for the comprehensive utilization of all biomass components in fractionation. Thus, the mass balance and component streams of lignocellulosic biomass during the fractionation process have become important research comp...

The deactivation of Ni/SiO2–Al2O3 catalyst in hydrogenation of crude 1,4-butanediol was investigated. During the operation time of 2140 h, the catalyst showed slow activity decay. Characterization results, for four spent catalysts used at different time, indicated that the main reason of the ca...

Experimental small- and wide-angle X-ray scattering (SWAXS) data, molecular dynamics simulations, and the complemented-system approach for the calculation of the SWAXS intensities from simulation data were used to study the hydrogen-bonded supramolecular assemblies formed in liquid 1,4-butanedio...