Radical addition of bromotrichloromethane to ethyl cinnamate was carried out under an ultrastrong gravitational field (>2.5 x 10(5)G), and ethyl 3-chloro-3-phenyl-2-(trichloromethyl)propionate (A), ethyl 3-bromo-3-pheny1-2-(trichloromethyl)propionate (B), and ethyl 2-bromo-3-pheny1-3-(trichloromethyl)propionate (C) were isolated by reversed-phase HPLC. To date, there has been no report of the synthesis of A and C at 1 G, and this would be the first example of a selectivity change induced by ultrastrong gravity.