The reaction of primary and secondary alkyl halides with mercury (II) acetate in oxiranes, oxetanes, and tetrahydropyran results in ring-opening to give the corresponding alkoxyalkyl acetates. Similar reactions with mercury (II) thiocyanate in oxetanes afford alkoxyalkyl isothiocyanate and thiocyanate, ROCH 2 C (R′) 2 CH 2 NCS and ROCH 2 C (R′) 2 CH 2 SCN, where the isomer ratios (N/S ratios) are 82–96/4–18. It is suggested that the ...