[PDF] Top 20 J. Braz. Chem. Soc. vol.10 número4
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J. Braz. Chem. Soc. vol.10 número4
... seus 10 anos de exis tên cia, a Asso ci a ção, hoje com 212 as so ci a dos, vem con cen - tran do seu tra ba lho em um de seus prin ci pa is ob je ti - vos, que é o de di vul gar e pro mo ver o uso da téc ni ca de ... See full document
2
J. Braz. Chem. Soc. vol.10 número4
... whose 1 H signals appeared as two doublets at δ 4.40 and 4.32 (J = 18.8 Hz) and the attribution of the chemical shifts of all methyl groups, was carried out by analysis of the HMBC spectrum (Figs. 2 and 3). It was ... See full document
4
J. Braz. Chem. Soc. vol.10 número4
... In order to carry out this work, carbons C-1, C-8, C-9, C-10 and C-11 of the polycyclic compounds were studied. Chlorinated and dechlorinated compounds were prepared according to procedures reported in the ... See full document
5
J. Braz. Chem. Soc. vol.10 número4
... MALME-3M cells treated with 10 µM SPM grew simi- larly to untreated cells for 120 h (Fig. 6). In the presence of BMS the cells grew for 48 h and then completely ceased growing.. There was significant loss in cell ... See full document
7
J. Braz. Chem. Soc. vol.10 número4
... spectrometer using TMS as the internal standard. Calcula- tions of carbon-13 chemical shifts were performed using the ACD/CNMR program (Version 1.0). Six alkylamino- hexanethiosulfuric acids (R = propyl, isopropyl, ... See full document
8
J. Braz. Chem. Soc. vol.10 número4
... neat methanol. Because of relatively rapid chemical exchange of the hydroxyl protons, no J-coupling is seen between the hydroxyl and methyl protons. Strong hydrogen bonding shifts the OH resonance line to about ... See full document
5
J. Braz. Chem. Soc. vol.10 número4
... 12. For 1 H-NMR data on 3 see Floyd, A.J.; Symes, K.C.; Fray, G.I.; Gymer, G.E.; Oppenheimer, A.W. Tetra- hedron Lett. 1970, 1735; 13 C-NMR (CDCl 3 , 300 MHz) 205.91 (s, C-1), 168.94 (s, C-2), 141.37 (s, C-3), 57.55 (d, ... See full document
4
J. Braz. Chem. Soc. vol.10 número4
... interaction studies were prepared by dissolving the respec- tive NBGH until the desired concentration (13 mM, 25 mM, 50 mM and 75 mM) in a 7.25 x 10 -5 M stock solution of BSA (98% - Aldrich Chemical Company). NMR ... See full document
6
J. Braz. Chem. Soc. vol.10 número4
... some like it hot The strong shielding and deshielding effects exerted by cyclic π-systems on surrounding protons has long fasci- nated annulene chemists who coined the terms diatropic and paratropic to describe the ... See full document
22
J. Braz. Chem. Soc. vol.10 número4
... t a n e ou s a c qu i si ti on of ec ho+a nti ec ho amplitude-modulated signals followed by their disentan- glement via techniques such as time-proportional phase incrementation (TPPI) or off-resonance irradiation ... See full document
15
J. Braz. Chem. Soc. vol.10 número4
... The position of the hydroxyl groups was obvious from the 1 H, 1 H coupling constants: 3 J(H-7’, H-8’) = 8.8 Hz (ortho-coupling); typical AA’XX’ sub-spectrum for H- 2/H-3/H-5/H-6 in 2; although the spin-system of ... See full document
3
J. Braz. Chem. Soc. vol.10 número4
... 8. Gaussian 94, Revision E.2, Frisch, M.J.; Trucks, G.W.; Schlegel, H.B.; Gill, P.M.W.; Johnson, B.G.; Robb, M.A.; Cheeseman, J.R.; Keith, T.; Petersson, G.A.; Montgomery, J.A.; Raghavachari, K.; Al-La- ham, M.A.; ... See full document
6
J. Braz. Chem. Soc. vol.10 número4
... stereoisomeric mixtures: an enantiomeric pair (R,R and S,S) and two meso compounds (R,S and S,R), in a 2:1:1 ratio (Scheme 2). These diastereomers were detected by 31 P- NMR, as three signals (0-10 ppm). ... See full document
6
J. Braz. Chem. Soc. vol.10 número4
... width is found for N550 with the greatest aggregate size. At around 240 K the sample filled with N110 with the smallest aggregate size has the highest line width. In spite of the high concentration of carbon black no ... See full document
8
J. Braz. Chem. Soc. vol.10 número4
... between 10 kHz and 90 ...x 10 -9 ) at this field and room temperature, the resulting spectrum demonstrates the high sensitivity of the SQUID detection ...x 10 -2 , an enhancement of seven orders of ... See full document
6
J. Braz. Chem. Soc. vol.10 número5
... In the present work, two electrochromic devices (or electrochromic windows) based on intrin- sically conducting polymers were assembled and characterized. For both devices, the materials used on the assembling were the ... See full document
7
J. Braz. Chem. Soc. vol.10 número6
... unknown equilibrium constants by least-square techniques were minimized. Three titrations were performed with the metal ion and each ligand. All the potentiometric studies were carried out in a Micronal (Brasil) model ... See full document
6
J. Braz. Chem. Soc. vol.10 número5
... concentration range from 6.5 x 10 -4 to 3.2 x 10 -3 mol L -1 , in 0.5 mol L -1 NaCl solution and v = 20 mV s -1 . To keep the pH constant, the buffers acetic acid/acetate (pH 3.5), biphthalate (pH 6.0) and ... See full document
5
J. Braz. Chem. Soc. vol.10 número5
... 15. (a) Grigg, R.; Montgomery, J.; Somasunderam, A. Tetrahedron 1992, 48, 10431. (b) de Kimpe, N.; Verhe, R.; de Buyck, L.; Schamp, N. J. Royal Netther- lands Chem. Soc. 1977, 96, 242. (c) ... See full document
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J. Braz. Chem. Soc. vol.10 número6
... concerning the chemical composition of the volatile com- pounds obtained were not completed, owing to the limita- tion in instrumental and analytical methods 3 . The direct thermal cracking of fatty acids (FFAs) and ... See full document
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