01863nas a2200265 4500008004100000022001400041245009900055210006900154260007900223300001400302490000800316520096200324653001701286653002001303653001401323653001101337653002101348653001101369100002101380700002401401700002001425700001801445700001501463856011901478 2013 eng d a0273-228900aBiodegradation of phenol by the yeast candida tropicalis: an investigation by NMR spectroscopy0 aBiodegradation of phenol by the yeast candida tropicalis an inve a999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USAbHUMANA PRESS INCcAPR a2029-20370 v1693 a

The process of phenol biodegradation by the yeast Candida tropicalis NCIM 3556 in aqueous medium was studied by H-1, C-13, and DOSY NMR techniques. Samples at regular intervals were centrifuged to separate the cells, and H-1 spectral data were collected at 400 MHz. Though a gradual decrease in the concentration of phenol was observed, after an incubation period of similar to 8 h, formation of any intermediate products could not be detected. Experiments carried out with uniformly C-13-labeled phenol also failed to detect formation of any carboxylic acid intermediates during degradation. The studies indicated that the phenol was completely degraded to carbon dioxide and water in approximately 20 h. Self-diffusion coefficient measurements showed that the lifetime of phenol in the bound form is too small to impart any change in its diffusion behavior and the intermediates formed are converted to carbon dioxide and water at a very fast rate.

10abiocatalysis10aCarboxylic acid10aDiffusion10aEnzyme10aNMR spectroscopy10aphenol1 aPhalgune, U., D.1 aRajamohanan, P., R.1 aGaikwad, B., G.1 aVarma, R., J.1 aGeorge, S. uhttps://library.ncl.res.in/content/biodegradation-phenol-yeast-candida-tropicalis-investigation-nmr-spectroscopy-001235nas a2200229 4500008004100000022001400041245010300055210006900158260000800227300001400235490000700249520043000256653002600686653002000712653003000732653002500762100002600787700002000813700002300833700002200856856012700878 2020 eng d a0376-469900aP2O5-mediated Friedel-Crafts acylation of activated arenes with carboxylic acid as acylating agent0 aP2O5mediated FriedelCrafts acylation of activated arenes with ca cDEC a1861-18670 v593 a

P2O5 has been found to be a highly efficient and environmental friendly catalyst for the liquid-phase acylation of activated aromatic substrates giving aromatic ketones (45-93%) in a regioselective manner. Both aromatic and aliphatic carboxylic acids can be employed as acylating source. The process is particularly demonstrated at 100 g scale in the case of anisole and acetic acid to produce 4-methoxyacetophenone.

10a4-methoxyacetophenone10aCarboxylic acid10aFriedel-Crafts acylations10aphosphorus pentoxide1 aKalshetti, Rupali, G.1 aMandle, Ram, D.1 aKamble, Sanjay, P.1 aSudalai, Arumugam uhttps://library.ncl.res.in/content/p2o5-mediated-friedel-crafts-acylation-activated-arenes-carboxylic-acid-acylating-agent02698nas a2200217 4500008004100000022001400041245017800055210006900233260000800302300001100310490000800321520186300329653002402192653002602216653002002242653001402262100002602276700002402302700002502326856012902351 2024 eng d a0961-953400aDirect oxidation of alcohols to carboxylic acids using simple and economical Pd@Glu-HTC catalyst: practical and scalable approach towards biomass based value added chemicals0 aDirect oxidation of alcohols to carboxylic acids using simple an cAUG a1072900 v1873 a

Sustainable catalytic transformation of bio-based alcohols to high value-added fine chemicals is an important topic of research. This work described preparation of simple and economical Pd@Glu-HTC catalyst from biomass derived low cost D-glucose. Hydrothermal carbonization of glucose was carried out in first step to synthesize GluHTC support in a simpler, greener, economical and efficient manner followed by incorporation of palladium metal on surface of the catalyst in second step. The catalyst was characterized using techniques such as Fourier Transform Infrared Spectroscopy (FT-IR), Solid-state Cross-Polarization Magic Angle Spinning Carbon-13 (13C CPMAS), Energy-dispersive X-ray spectroscopy (EDAX), Powder X-ray diffraction (P-XRD), X-ray photoelectron spectroscopy (XPS), Thermogravimetric/Differential Thermal Analyzer (TG-DTA), Field emission scanning electron microscopy (FE-SEM) and High-resolution transmission electron microscopy (HR-TEM). The catalyst was evaluated for direct oxidation of alcohols to yield carboxylic acids and exhibited very good catalytic activity for wider substrate scope. Oxidation of alcohols was carried out using milder base, molecular oxygen and water as a solvent to achieve 92-99 % excellent yields. The practical utility of current strategy was also studied for gram scale synthesis of bio-based value added industrially important chemicals such as furoic acid (flavouring agent and preservative in industry), 2, 5-furan-dicarboxylic acid (monomer to 100 % fossil-free, recyclable polymer polyethylene furanoate (PEF), tetrahydro-2-furoic acid (production of many drugs) and vanillin (important product of flavor and fragrance industry). Pd@Glu-HTC catalyst was found to be reusable for four recycles and the catalytic performance was retained without any loss in its activity after four cycles.

10aBio-based chemicals10aCarbonaceous catalyst10aCarboxylic acid10aOxidation1 aKirdant, Swapnali, P.1 aBankar, Shubham, R.1 aJadhav, Vrushali, H. uhttps://library.ncl.res.in/content/direct-oxidation-alcohols-carboxylic-acids-using-simple-and-economical-pdglu-htc-catalyst