[5,5-difluoro-6-hydroxy-4-methyl-6-(trifluoromethyl)-1,3-dioxan-4-yl] 2,2-dimethylbutanoate;[2,2-difluoro-6-hydroxy-4-methyl-6-(trifluoromethyl)oxan-4-yl] 2,2-dimethylbutanoate;[5,5-difluoro-6-hydroxy-6-(trifluoromethyl)-1,3-dioxan-4-yl] 2,2-dimethylbutanoate;[3,3-difluoro-2-hydroxy-2-(trifluoromethyl)oxan-4-yl] 2,2-dimethylbutanoate;[2-hydroxy-2,4-bis(trifluoromethyl)oxan-4-yl] 2,2-dimethylbutanoate;[2-hydroxy-4,6-dimethyl-2,6-bis(trifluoromethyl)oxan-4-yl] 2,2-dimethylbutanoate;[2-hydroxy-4-methyl-2-(trifluoromethyl)oxan-4-yl] 2,2-dimethylbutanoate;[2-hydroxy-6-methyl-2,4,6-tris(trifluoromethyl)oxan-4-yl] 2,2-dimethylbutanoate;[6-hydroxy-6-(trifluoromethyl)-1,3-dioxan-4-yl] 2,2-dimethylbutanoate;[2-hydroxy-2-(trifluoromethyl)oxan-4-yl] 2,2-dimethylbutanoate;[3,3,5,5-tetrafluoro-2-hydroxy-2,6-bis(trifluoromethyl)oxan-4-yl] 2,2-dimethylbutanoate;[3,3,5,5-tetrafluoro-2-hydroxy-6-methyl-2,6-bis(trifluoromethyl)oxan-4-yl] 2,2-dimethylbutanoate;[3,3,5,5-tetrafluoro-2-hydroxy-2-(trifluoromethyl)oxan-4-yl] 2,2-dimethylbutanoate