S-1-[N-(Benzylidene)hydrazinylcarbonyl]-2-hydroxyethylcarbamate esters: layered structures created from H•••O ( = N,O) hydrogen-bonds
Authors: Howie, R.A.; De Souza, M.V.N.; Pinheiro, A.C.; Kaiser, C.R.; Wardell, J.L.; Wardell, S.M.S.V. Source: Zeitschrift für Kristallographie, p. 110302053145056-491, 2011 Publisher: De Gruyter Abstract The molecular structures of tert-butyl (S)-2-hydroxy-[N-(substituted-benzylidene)hydrazinyl-carbonyl]-ethylcarbamates, C15H20N3O4X (3: X = H, o-OH, o-NO2, m-NO2 and p-CN), derived from L-serine, are formally rather similar. Despite the variation in substituent, X, tricälinic […]
Ethambutol analysis by copper complexation in pharmaceutical formulations: spectrophotometry and crystal structure
Authors: Faria, A.F.; Marcellos, L.F.; Vasconcelos, J.P.; De Souza, M.V.N.; Do Carmo, W.R.; Diniz, R.; Oliveira, M.A.L. Source: Journal of the Brazilian Chemical Society (Impresso), v. 22, p. 867-874, 2011. Publisher: Brazilian Chemical Society Abstract An alternative method for ethambutol (ETB) determination by UV spectrophotometry in pharmaceutical formulations using ETB complexation with Cu(II) was optimized […]
