Serafin Valverde

Bio: Serafin Valverde is an academic researcher from Spanish National Research Council. The author has contributed to research in topics: Radical cyclization & Allylic rearrangement. The author has an hindex of 23, co-authored 161 publications receiving 1879 citations.

Changes in the carbohydrate composition of legumes after soaking and cooking

Abstract: Using a high-performance liquid chromatography (HPLC) method, researchers analyzed the sugar composition of chick-peas, kidney beans, and lentils at various points in the preparation and cooking process: after soaking, after "normal" cooking (ie, boiling), after pressure-cooking, and after cooked legumes had been held at 35°C for 5 hours There was a considerable decrease in the amount of monosaccharides, disaccharides, and raffinose oligosaccharides in chick-peas and kidney beans after soaking and cooking This change in carbohydrate composition was less pronounced when the cooking water was not drained before analysis, which was the method used when analyzing the lentils Method of cooking (either boiling or pressure-cooking) did not have different effects on the sugar composition of chick-peas and lentils, but loss of oligosaccharides was slightly higher when kidney beans were boiled than when they were pressure-cooked Loss of α-galactosides occurred in chick-peas and kidney beans that had been boiled and then held at 35°C for 5 hours The HPLC analysis showed that manninotriose was not one of the oligosaccharides present in these legumes

Microwave-Promoted Transformations: Fast and Chemoselective N-Acylation of Amino Alcohols Using Catalytic Amounts of Dibutyltin Oxide. Influence of the Power Output and the Nature of the Acylating Agent on the Selectivity

Abstract: The influence of the nature of the acylating agent and the power output on the chemoselectivity of the microwave-mediated acylation of 1,2- and 1,3-amino alcohols catalyzed by dibutyltin oxide has been studied. The method constitutes an efficient procedure for the selective N-acylation of amino alcohols.

The Sonogashira Reaction: A Booming Methodology in Synthetic Organic Chemistry†

Abstract: 3.7. Palladium Nanoparticles as Catalysts 888 3.8. Other Transition-Metal Complexes 888 3.9. Transition-Metal-Free Reactions 889 4. Applications 889 4.1. Alkynylation of Arenes 889 4.2. Alkynylation of Heterocycles 891 4.3. Synthesis of Enynes and Enediynes 894 4.4. Synthesis of Ynones 896 4.5. Synthesis of Carbocyclic Systems 897 4.6. Synthesis of Heterocyclic Systems 898 4.7. Synthesis of Natural Products 903 4.8. Synthesis of Electronic and Electrooptical Molecules 906

Recent advances in Sonogashira reactions

Abstract: The coupling of aryl or vinyl halides with terminal acetylenes catalysed by palladium and other transition metals, commonly termed as Sonogashira cross-coupling reaction, is one of the most important and widely used sp2–sp carbon–carbon bond formation reactions in organic synthesis, frequently employed in the synthesis of natural products, biologically active molecules, heterocycles, molecular electronics, dendrimers and conjugated polymers or nanostructures. This critical review focuses on developments in the Sonogashira reaction achieved in recent years concerning catalysts, reaction conditions and substrates (352 references).