1H NMR chemical shifts and proton-proton coupling constants for some 3-substituted 2-methylpropenes [YCH2C(Me)CH2, Y = H, Cl, Br, I, OH, OMe, OEt, SH, SMe, SEt, NMe2 and NEt2] are reported. Resonances of the olefinic protons were assigned through lanthanide-induced shifts. Chemical shifts of the olefinic protons (HA and HB) showed a dependence on the substituent at C-3 of the allylic fragment. Long-range allylic coupling constants (4Jcisoid for HA and CH2 and HB and Me; 2Jtransoid for HB and CH2 and HA and Me) were determined by spectral expansion and simulation. © 1997 by John Wiley & Sons, Ltd.353147152Kowalewsky, D.G., (1971) J. Magn. Reson., 4, p. 249Curry, E.R., Sardella, D.J., (1962) J. Am. Chem. Soc., 84, p. 2748Barfield, M., Spear, R.J., Sternhell, S., (1976) Chem. Rev., 76, p. 593Contreras, R.H., Facelli, J.C., Kowalewsky, D.G., (1982) Org. Magn. Reson., 20, p. 40Whipple, E.B., Goldstein, J.H., Mandell, L., (1960) J. Am. Chem. Soc., 82, p. 3010ApSimon, J.W., Beierbeck, H., Fruchiera, A., (1972) Can. J. Chem., 50, p. 2725Hinckley, C.C., (1969) J. Am. Chem. Soc., 91, p. 5160Sievers, R.E., (1973) Nuclear Magnetic Resonance Shift Reagents, , Academic Press, New YorkFukumi, T., Arata, Y., Fujiwara, S., (1968) J. Mol. Spectrosc., 27, p. 443Inamoto, N., Masuda, S., Tori, K., Nishikawa, J., (1983) Tetrahedron Lett., 24, p. 5265Hansch, C., Leo, A., (1979) Substituent Constants for Correlation Analysis in Chemistry and Biology, , Wiley-Interscience, New YorkCharton, M., (1981) Prog. Phys. Org. Chem., 13, p. 119Charton, M., (1987) Prog. Phys. Org. Chem., 16, p. 287Curry, R., Sardella, D.J., (1974) J. Am. Chem. Soc., 96, p. 1822Durig, D.T., Little, T.S., Durig, J.R., (1993) Spectrochim. Acta, Part A, 49, p. 1873Durig, J.R., Eltayeb, S., Guirgis, G.A., (1994) J. Raman Spectrosc., 25, p. 767Rittner, R., Braibante, M.E.F., (1992) Magn. Reson. Chem., 30, p. 420Abraham, R.J., Bovill, M.J., Chadwick, D.J., Griffiths, L., Sancassan, F., (1980) Tetrahedron, 36, p. 279