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Thermally Induced Sigmatropic Isomerization of Pseudosaccharyl Allylic Ether
Gómez-Zavaglia, A.; Kaczor, A.; Almeida, R.; Cristiano, M. L. S.; Eusébio, M. E. S.; Maria, T. M. R.; Mobili, P.; Fausto, R.The thermally induced sigmatropic isomerization of the pseudosaccharyl allylic ether [3-(allyloxy)-1,2-benzisothiazole 1,1-dioxide; ABID] has been investigated by a multidisciplinary approach using temperature dependent infrared spectroscopy, differential scanning calorimetry, and polarized light thermomicroscopy, complemented by theoretical methods. Migration of the allylic system from O to N occurs in the mel...
First observation of Chapman rearrangement of a pseudosaccharyl ether in the so...
Almeida, R.; Gómez-Zavaglia, A.; Kaczor, A.; Cristiano, M.L.S.; Eusébio, M.E.S.; Maria, T.M.R.; Fausto, R.3-(Methoxy)-1,2-benzisothiazole 1,1-dioxide, a pseudosaccharyl ether, was long ago known to undergo a thermal Chapman-like [1,3′]-isomerization to the corresponding N-methyl pseudosaccharin at temperatures above its melting point (ca. 184 °C) [Hettler H., Tetrahedron Lett.1968, 15, 1793]. In the present study, it is shown that this rearrangement can also take place in the solid state, at temperatures as low as ...
First observation of Chapman rearrangement of a pseudosaccharyl ether in the so...
Almeida, R.; Gómez-Zavaglia, Andrea; Kaczor, A.; Cristiano, M. L. S.; Eusébio, M. E. S.; Maria, T. M. R.; Fausto, R.3-(Methoxy)-1,2-benzisothiazole 1,1-dioxide, a pseudosaccharyl ether, was long ago known to undergo a thermal Chapman-like [1,3']-isomerization to the corresponding N-methyl pseudosaccharin at temperatures above its melting point (ca. 184 °C) [Hettler H., Tetrahedron Lett. 1968, 15, 1793]. In the present study, it is shown that this rearrangement can also take place in the solid state, at temperatures as low as...
Characterization of S-layer proteins of Lactobacillus by FTIR spectroscopy and ...
Mobili, P.; Londero, A.; Maria, T.M.R.; Eusébio, M.E.S.; De Antoni, G.L.; Fausto, R.; Gómez-Zavaglia, A.FTIR spectroscopy was used for the characterization of S-layer proteins extracted from microorganisms isolated from kefir grains. S-layer from Lactobacillus brevis ATCC 8287 has been already characterized [G. Vidgren, I. Palva, R. Pakkanen, K. Lounatmaa, A. Palva, J. Bacteriol. 174 (1992) 7419] and therefore it was used for the validation of FTIR as a method to investigate the secondary structure of the S-layer...
Permeation of sodium dodecyl sulfate through polyaniline-modified cellulose ace...
Valente, A. J. M.; Burrows, H. D.; Polishchuk, A. Ya.; Domingues, C. P.; Borges, O. M. F.; Eusébio, M. E. S.; Maria, T. M. R.; Lobo, V. M. M.The preparation of polyaniline (PANi)-cellulose acetate (CA) blends by casting films from a suspension, is reported. Two membranes were prepared from different solvents, one with a homogeneous and the other a heterogeneous dispersion of PANi in CA matrices. The membranes were characterized by X-ray diffraction, SEM, DSC, and FTIR, and the results were compared with those obtained for pure CA and PANi films. The...
Solvation of alkane and alcohol molecules. Energy contributions
Pais, A. A. C. C.; Sousa, A.; Eusébio, M. E.; Redinha, J. S.In this work we conduct a systematic ab initio study of the solvation of small alkane, monoalcohol and diol molecules, in polar solvents with different properties. A choice of basis set suitable for the type of compounds under study is presented. The various components of the solvent–solute interaction and the cavitation energy are treated individually and their variation with chain length and introduction of h...
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