A5009564292- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Organic Chemistry Cycloaddition Reactions
- Ionic liquids properties and applications
- Axial and Atropisomeric Chirality Synthesis
- Chemical Synthesis and Reactions
- Synthesis and Catalytic Reactions
- Molecular spectroscopy and chirality
- Crystal structures of chemical compounds
- Asymmetric Synthesis and Catalysis
- Oxidative Organic Chemistry Reactions
- Crystallography and molecular interactions
- Synthesis and Reactions of Organic Compounds
- Synthesis and biological activity
- Catalysis and Oxidation Reactions
- Sulfur-Based Synthesis Techniques
- Problem and Project Based Learning
- Chemical Safety and Risk Management
- Carbon dioxide utilization in catalysis
- Inorganic and Organometallic Chemistry
- Bone Tissue Engineering Materials
- Phytochemistry and Biological Activities
- Biochemical Acid Research Studies
- Carbohydrate Chemistry and Synthesis
- Innovative Educational Technologies
Universidad de Extremadura
2005-2022
Leibniz University Hannover
1998
University of California, Los Angeles
1998
Extraction of dibenzothiophene from dodecane using ionic liquids as the extracting phase has been investigated for a range with varying cation classes (imidazolium, pyridinium, and pyrrolidinium) anion types liquid–liquid partition studies QSPR (quantitative structure–activity relationship) analysis. The ratio to showed clear variation class (dimethylpyridinium > methylpyridinium pyridinium ≈ imidazolium pyrrolidinium), much less significant type. Polyaromatic quinolinium-based even greater...
Cigarette butts are one of the most common types litter all around world. This waste when disposed in environment pose a major threat to living organisms and ecosystem health. mainly made cellulose acetate (2.45 substitution) that biodegrades slowly can take up 18 months break down under normal conditions. Cellulose is valuable polymer be used for great variety applications. In this communication, we present results from an ongoing study addressed value cigarette butt based on recovery by...
2-Amino-2-thiazoline derivatives bearing alkyl or aryl substituents at exocyclic nitrogen have been condensed with different isocyanates and isothiocyanates. The addition occurs ring endocyclic in a regiospecific manner to afford kinetic enthalpy-favored adducts. unequivocal assignment of these structures has confirmed by X-ray diffraction analyses several compounds. endo adducts do not rearrange on heating the sole exception which remains unsubstituted. Trapping experiments presence other...
2-Aminothioisomünchnones, a well-known family of masked dipoles, react with aromatic aldehydes in domino cascade reaction that produces episulfides (thiiranes) or beta-lactams (2-azetidinones). This sequence is initiated by [3+2] dipolar cycloaddition followed ring opening cycloadducts and intramolecular rearrangement to afford these unusual contractions. The nature the products depends on structural characteristics starting dipole experimental conditions. Episulfides are obtained...
Dihydrothiophenes can easily be obtained by a general protocol involving the reaction of 2-aminothioisomünchnones with electron-deficient alkenes. The overall process interpreted as sequential [3+2] cycloaddition/ring-opening cyclization reaction. structures products could unequivocally assigned X-ray diffraction analysis. A theoretical study at semiempirical level (PM3) further single-point refinement energies B3LYP/6−31G* also offers mechanistic insights into stereochemical outcome.
Abstract This communication presents the first study on use of azodicarboxamides against mesoionic heterocycles as 1,3‐dipoles. The reactions yield thioureido compounds. Their formation could be explained, basis experimental results and preliminary theoretical calculations, by a nucleophilic addition followed rearrangement; however, formal 1,3‐dipolar cycloaddition subsequent fragmentation rearrangement transient cycloadducts not ruled out. Reactions are carried out in refluxing toluene...
The present paper summarizes a straightforward synthesis of 4,5-dihydro-1,3,4-thiadiazoles by the 1,3-dipolar cycloaddition thioisomünchnones. These reactions have been carried out in dichloromethane and are essentially complete within 60 min at room temperature. Under such mild conditions asymmetric version has explored as well. Unequivocal structure elucidation accomplished means one- two-dimensional NMR techniques well X-ray analysis.
The catalytic activity of six different carbons was tested in the solvent-free acetylation reaction alcohols, phenols, and monosaccharides with acetic anhydride. Three commercial carbons—a basic activated carbon M (Merck KGaA), a moderately gel X (Xerolutions S.L.), an N (Norit Netherland B.V.)—were studied. From these carbons, three acidic carbons—M-S, X-S, N-S—were obtained by treatment sulfuric acid. All were characterized means nitrogen adsorption capacity, porosimetry, elemental organic...
Abstract The development of new chemical synthetic methodologies that transform industrial processes into more sustainable ones, constitutes one the challenges and objectives research both in academia industry. use activated carbons as heterogeneous catalysts represents most beneficial options for process efficiency terms reaction rate, yield, ease work-up. We have produced six by treatment three affordable commercial with either nitric acid, or sulfuric acid. complete characterization these...