1: 2,2,2-trimethylacetic acid With tetra(n-butyl)ammonium hydrogensulfate; sodium hydrogencarbonate in dichloromethane; water 0.166667 h; Cooling with ice; 2: thiocarbonic acid S-ethyl ester O-iodomethyl ester in dichloromethane; water T=20°C;

in tetrahydrofuran T=20°C; 14 h;

in N,N-dimethyl-formamide 16 h; Ambient temperature;