1H-1H Long range couplings in fused cyclopropanes. NMR spectral assignment and conformation of 17,18-cyclosteroids

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1H-1H NMR couplings through four bonds ( 4JH-H) involving cyclopropane hydrogens were calculated for model compounds by semiempirical methods and used for the 13C and 1H NMR spectral assignment of 17,18-cyclosteroids. The couplings (4JHH) between cyclopropyl and non-cyclopropyl hydrogens follow an a...

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Detalles Bibliográficos
Autor principal: Sproviero, E.M
Otros Autores: Ferrara, A., Contreras, Rubén Horacio, Burton, G.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: Royal Society of Chemistry 1996
Acceso en línea:Registro en Scopus
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Biblioteca Central Dr. Luis F. Leloir (FCEN) de Universidad de Buenos Aires
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100 1 |a Sproviero, E.M. 
245 1 0 |a 1H-1H Long range couplings in fused cyclopropanes. NMR spectral assignment and conformation of 17,18-cyclosteroids 
260 |b Royal Society of Chemistry  |c 1996 
270 1 0 |m Burton, G.; Departamento de Química Orgánica, Universidad de Buenos Aires, Ciudad Universitaria, (1428) Buenos Aires, Argentina 
504 |a Nickisch, K., Bittler, D., Laurent, H., Losert, W., Casals-Stenzel, J., Nishino, Y., Schillinger, E., Wiechert, R., (1987) J. Med. Chem., 30, p. 1403 
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504 |a Blumbach, J., Hammond, D.A., Whitting, D.A., (1986) J. Chem. Soc., Perkin Trans. 1, p. 261 
504 |a Ferrara, A., Benedetti, M.O.V., Ghini, A.A., Burton, G., (1993) J. Chem. Res. (S), p. 276 
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504 |a Diz, A.C., Giribet, C.G., Ruiz De Azúa, M.C., Contreras, R.H., (1990) Int. J. Quantum Chem., 37, p. 663 
504 |a Aucar, G.A., Contreras, R.H., (1991) J. Magn. Reson., 93, p. 413 
504 |a Aucar, G.A., unpublished work; Marat, K., Templeton, J.F., Ling, Y., Lin, W., Gupta, R.K., (1995) Magn. Reson. Chem., 33, p. 529 
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504 |a Desai, U.R., Trivedi, G.K., (1991) J. Org. Chem., 56, p. 4625 
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506 |2 openaire  |e Política editorial 
520 3 |a 1H-1H NMR couplings through four bonds ( 4JH-H) involving cyclopropane hydrogens were calculated for model compounds by semiempirical methods and used for the 13C and 1H NMR spectral assignment of 17,18-cyclosteroids. The couplings (4JHH) between cyclopropyl and non-cyclopropyl hydrogens follow an angular dependence which resembles that of allylic couplings. Solution conformations of rings C-D and the side-chain of 17,18-cyclopregnanes were determined from semiempirical molecular orbital calculations, three and four bond 1H-1H coupling constants and NOE measurements.  |l eng 
593 |a Departamento de Química Orgánica, Universidad de Buenos Aires, Ciudad Universitaria, (1428) Buenos Aires, Argentina 
593 |a Departamento de Física, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, (1428) Buenos Aires, Argentina 
700 1 |a Ferrara, A. 
700 1 |a Contreras, Rubén Horacio 
700 1 |a Burton, G. 
773 0 |d Royal Society of Chemistry, 1996  |g v. 5  |h pp. 933-938  |p J Chem Soc Perkin Trans 2  |x 03009580  |w (AR-BaUEN)CENRE-119  |t Journal of the Chemical Society. Perkin Transactions 2 
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