from Eliel, Ernest Conformational Analysis, Washington, D.C. 1981, p. 11
Energy diff (kcal/mol).....Relative Rate..............% Stable Isomer
0 .......................................1.0......................................50
.24.....................................1.5......................................60
.50.....................................2.33....................................70
.82.....................................4.0......................................80
1.03...................................5.7......................................85
1.3.....................................9.0......................................90
1.7...................................19.0......................................95
2.7...................................99.0......................................99
4.1.................................999.0......................................99.9
these ratios are at room temperature (25 oC)