1: With N-iodo-succinimide; N-hexadecyl-N,N,N-trimethylammonium bromide in 1,4-dioxane; water T=115°C; 0.25 h; Microwave irradiation; 2: With dipyridinium dichromate; acetic acid in 1,4-dioxane; water T=115°C; 0.25 h; Microwave irradiation;