Julián E. Sánchez-Velandia

Universitat Jaume I | UJI · Department of Inorganic and Organic Chemistry

Since 5-(hydroxymethyl)furfural (HMF) has been labelled as the “sleeping giant” of the bio-based platform-chemical realm, numerous investigations have been devoted to the exploitation of this versatile molecule and its endless chemical transformations into novel monomers for producing bio-based polymers. However, beyond 2,5-furandicarboxylic acid (...

Monoterpenes derived from various biomass constitute an important platform for synthesizing fragrances, intermediates, and pharmaceuticals. In this review, the most recent and relevant transformations of terpenes are discussed with the primary focus on heterogeneous catalysis emphasizing green chemistry and green chemical engineering aspects. This...

A novel approach is reported to prepare 3D-printed polymers that incorporate metal-organic frameworks (MOFs) through a one-pot growth process, involving covalent grafting and growth onto 3D polymeric surfaces. The resulting hybrid materials were subjected to comprehensive characterization using techniques such as SEM, XRD, FTIR, Raman, and XPS. The...

Nanoparticles are of great interest in material science due to their characteristics, such as high surface area, biocompatibility, and unique optical properties. Within the search for more ecological and efficient pathways to synthesize nanoparticles, there is a special interest in the synthesis of bacterial biofilms. Biofilms are self-organized co...

Synthesis of Nanomaterials is a beginner's guide to the synthesis and characterization of biomaterials for medical devices and implants. It presents 8 chapters explaining the use of biomaterials in medicine and pharmacology. The concepts are explained with the guidance of specialists who present the principal techniques and methods to obtain high-p...

In this contribution, several multifunctional heterogeneous catalysts comprising an acid and a metal function were synthesized by wetness impregnation and tested in the allylic oxidation (with hydrogen peroxide as an oxidizing agent) of β-pinene, a monoterpene which is present in several plants being one of the main constituents of the turpentine o...

Brønsted acid catalyzed Prins-Ritter reaction for selective synthesis of terpenoid-derived 4-amidotetrahydropyran compounds, Abstract A number of SO 3 H-functionalized solids (biochar, montmorillonites, carbon and halloysite nanotubes) has been studied as catalysts in the cascade Prins-Ritter reaction of (-)-isopulegol with benzaldehyde and acetoni...

Bioelectronics searches for the union between living systems and electronic devices, which would allow understanding, monitoring, stimulating, and controlling electrical signals at a biological level, to advance in the diagnosis, treatment, and prophylaxis of diseases, as well as in the development of devices and tools to study the biological syste...

In the current study were development calculations based on Density Functional Theory (DFT) with the B3PW91/LANL2DZ approach for optimizing both monometallic and bimetallic systems: Au9, Au8Pd, Au8Pt, AuPd8, AuPt8, Pd9 y Pt9. Such materials were theoretically tested as catalyst for the oxidation of carbon monoxide (CO) and the most favorable system...

In this contribution, heterogeneous materials based on heteropolyacids (HPA, H 3 PW 12 0 40 hydrate) supported over several metal oxides (TiO 2 , SiO 2 , SBA-15, Al 2 O 3) were prepared using wetness impregnation, characterized by XRD, FTIR, SEM, acidity by TPD, nitrogen physisorption, RAMAN spectroscopy, 31 P NMR and then evaluated in the catalyti...

Biomass valorization by isomerization of β-pinene epoxide was carried out over Fe supported on MCM-41 and SBA-15 materials. Several reaction conditions (kind of solvent, amount of catalyst, temperature, and time) were evaluated; myrtanal selectivity up to 85% was obtained (70 °C, 750 rpm, acetonitrile as solvent, 24 h) at a conversion of 99%. Appar...

Reaction mechanisms of limonene epoxide isomerization for obtaining dihydrocarvone and carvenone as main products were proposed using three computational methodologies. It was deduced that carvenone can be obtained with a low energetic barrier with respect to dihydrocarvone that is its intermediate; these findings are in accordance with the experim...

Selective synthesis of limonene 1,2-diol from limonene epoxide was performed over hierarchical zeolites synthesized by a top-down strategy. Acid treatment of commercial zeolite (CBV-500) induced formation of mesopores, increased Si/Al ratio and stronger Brönsted acid sites with a low penalty on microporosity and crystallinity. The highest selectivi...

In this contribution, the thermodynamic analysis of α-and β-pinene epoxide isomerization over Fe and Cu supported on MCM-41 is presented using computational chemistry and group contribution methods (GCMs). Some physical−chemical data (T c , P c , v c , Z c , ω, T b , T fus) and thermodynamic (S°2 98.15 , C p,298.15°, C v,298.15°, ΔH f,298.15°, ΔG f...

In this work, several heterogeneous micro- and mesoporous, acidic catalysts were tested for the selective synthesis of Florol®, an industrial product formed via condensation and rehydration starting from isoprenol and isovaleraldehyde in dimethylcarbonate as a solvent. The results showed that a mildly acidic, microporous H-Beta-300 with SiO2/Al2O3...

The Prins/Friedel-Crafts cascade reactions of the terpenoid trans-4-hydroxymethyl-2-carene (synthesized from 3-carene) with aromatic aldehydes were systematically studied for the first time on acidic mesoporous clays (halloysite, illite, montmorillonites). Both the reaction rate and selectivity to the desired polycyclic product with tetrahydrofuran...

Isomerization of α-pinene epoxide was performed over several Fe or Cu supported on MCM-41 and SBA-15 catalysts. The effect of the metal loading and polarity of the solvent on substrate conversion and selectivity was analyzed. It was found that materials containing Fe are more active but less selective to campholenic aldehyde and trans-carveol than...

Isomerization of β-pinene epoxide to perillyl alcohol using several materials based on titanium and molybdenum is reported. The metals were incorporated on SBA-15, MCM-41 and SiO2 supports by incipient wetness impregnation and characterized by XRD, atomic absorption, BET, Raman spectroscopy, diffuse reflectance UV–Vis spectroscopy, TPD-NH3 and ²⁹Si...

The selective synthesis of fine chemicals from wasted derived biomass is one of the main challenges for the industry for valorizing and transforming these products into valuable substances. In this work, several materials based on zeolites, titanium dioxide, titanates and molybdenum were tested in the isomerization reaction of biomass derived α- an...

Isomerization of α-pinene epoxide was carried out over a Colombian natural zeolite as potential geocatalyst with heulandite, chabazite and clipnotilolite as main crystallographic phases; the heulandite was identified as the active phase. Over synthetic zeolites, isomerization of α-pinene epoxide depended on Si/Al ratio, unit cell and the kind of st...

Solvent plays an important role in the industrial processes; in the case of organic chemistry, the solvent could affect the selectivity of a specific molecular target. Monoterpene oxides are intermediate compounds that can be rearrangement into products as aldehydes, ketones and diols and their selectivity can be tailored by the solvents that can s...

Kinetic study of the photo-assisted oxygen atom transfer reaction (OAT) using a dioxo-Mo complex anchored on TiO2, stimulated by light, was performed at ambient conditions using triphenylphosphine (PPh3) as a model molecule. The kinetic of the OAT reaction was studied with three catalytic systems: 4,4’-dicarboxylate-2,2’-bipyridinedioxochloromolybd...

The reaction mechanism of the isomerization of α and β-pinene epoxides with Fe species as catalysts was studied with DFT calculations and an experimental methodology. β-pinene epoxide can be isomerized into myrtanal and myrtenol in four steps; while in the case of perillyl alcohol, two additional steps are necessary. On the other hand, high selecti...

A kinetic study for the isomerization of α-pinene epoxide over Fe/SBA-15 and Fe/ MCM-41 catalysts was developed using a pseudo-homogeneous (polynomial law) and heterogeneous (LHHW formalism with one and two actives sites) models. TEM analysis of Fe/SBA-15 and Fe/MCM-41 showed that the materials have the typical hexagonal organization; FTIR adsorpti...

A natural zeolite presents in rocks of volcanic origin located in Colombia was characterized and tested for the isomerization of β-pinene epoxide. The material was characterized by TPD-NH3, BET, SEM, FRX, FTIR of adsorption-desorption of pyridine, TPD-CO2 and TPR-H2. It was found that 65% of the acidity was strong and 75% was Lewis type; the materi...

Fe and Cu based heterogeneous catalysts were evaluated in the isomerization reaction of α- and β-pinene epoxides. The metals were incorporated on SBA-15 and MCM-41 using incipient wetness impregnation procedure and the materials were characterized by XRD, Raman spectroscopy, BET analysis, NH3-TPD, TEM and XPS. 1.4/Fe-MCM-41 was the catalyst with th...

Se sintetizó el catalizador Cu/MCM-41 mediante impregnación húmeda incipiente y se caracterizó por DRX, XPS, TPD-NH3 y adsorción-desorción de N2. Se evaluó el efecto de diferentes condiciones de reacción (temperatura, tiempo, tipo de solvente y cantidad de catalizador) en la isomerización del epóxido de α-pineno para la obtención de aldehído canfol...

An exploratory reaction mechanism for the transformation of beta pinene epoxide into myrtanal was proposed based on computational and theoretical information. The theoretical study was carried out using 33YLP/LanL2dz//B3YLP/6-31G(d,p) including the effect of the solvent.

Natural zeolite as potential geocatalyst was evaluated for ring-opening of alpha and beta pinene epoxides for obtaining high-added value chemicals.