in chloroform 0.0833333 - 0.166667 h;

1: phosgene; (4-(3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyl)phenyl)methanol in tetrahydrofuran; toluene T=20°C; 18 h; 2: dicyclohexylamine salt of N-hydroxysuccinimide in chloroform T=20°C; 3 h;