The synthesis of 40 fungitoxic analogues of the systemic fungicides N-(2,2,2-trichloro-1-methoxyethy1)formamide and triforine is described. The compounds comprise N-(2,2,2-trichloro-1-alkoxyethy1)formamides and related alkylaminoethyl, alkylthioethyl and arylthioethyl derivatives.