Browsing by Author "Pessoa Mahana, Hernán"

Now showing items 1-6 of 6

    • Conformational dynamics of substituted N-acetyl-N-phenylbenzylamines. 1H-DNMR and AM1-MO study 
      Weiss López, Boris; Saitz Barría, Claudio; Pessoa Mahana, Hernán; Valderrama, Jaime; Araya Maturana, Ramiro (2001)
      Activation parameters for the rotation around the methylene-nitrogen single bond found in a series of four 2,2'-disubstituted N-acetyl-N-phenylbenzylamines, dissolved in DMSO-d6, were measured employing the temperature ...
    • Effects of 4,4-Dimethyl-5,8-dihydroxynaphtalene-1-one and 4,4-Dimethyl-5,8-dihydroxytetralone Derivatives ... 
      Araya Maturana, Ramiro; Delgado Castro, Tomás; Gárate, Mario; Ferreira Parker, Jorge; Pavani, Mario; Pessoa Mahana, Hernán; Cassels Niven, Bruce (Elsevier Science Ltd., 2002-01-29)
      Abstract—A set of structurally related compounds incorporating a carbonyl group in the ortho position withregard to a phenol function were tested against the TA3 mouse carcinoma cell line and its multidrug-resistant variant ...
    • Long-range correlations (nj C,H n > 3) in the HMBC spectra of 3-(4-oxo-4H-chromen-3-YL)-acrylic acid ethyl esters 
      Araya Maturana, Ramiro; Gavín-Sazatornil, José A.; Heredia Moya, Jorge; Pessoa Mahana, Hernán; Weiss López, Boris (Sociedade Brasileira de Quimica, 2005)
      A systematic study about the long-range correlations observed in the HMBC spectra of a series of cis and trans 3-(4-oxo-4H-chromen-3-yl)-acrylic acid ethyl esters, and 5-hydroxy derivatives, was carried out. The results ...
    • NMR assignment in regioisomeric hydroquinones 
      Dobado, Jose A.; Gómez-Tamayo, José C.; Calvo-Flores, Francisco G.; Martínez-García, Henar; Cardona, Wilson; Weiss López, Boris; Ramírez Rodríguez, Oney; Pessoa Mahana, Hernán; Araya Maturana, Ramiro (2011)
      A set of regioisomeric pairs of tricyclic hydroquinones, analogues of antitumor 9,10-dihydroxy-4,4-dimethyl-5,8-dihydroanthracen-1(4H)-one (1) and other derivatives, were synthesized and their regiochemistry and NMR spectra ...
    • Very long-range correlations (nJC,H n > 3) in HMBC spectra 
      Araya Maturana, Ramiro; Pessoa Mahana, Hernán; Weiss López, Boris (2008)
      The structural elucidation of natural products and complex organic molecules relies heavily on the application of proton detected heteronuclear NMR. Among these techniques, the HMBC NMR experiment remains as the most popular ...
    • Vibrational study of polyamine copper(II) complexes. Infrared spectra and normal coordinate analysis of ... 
      Díaz, Guillermo; Diez, Sylvia; López, Luis; Muñoz, René; Pessoa Mahana, Hernán; Campos Vallette, Marcelo (1992)
      The results of an investigation of the infrared spectra of mono(diethylenetriamine)copper(II) compounds are reported, with particular reference to the low-energy region. Most assignments are based on the available literature. ...