) δ -000.00. HRMS calculated for C~00~H~00~O~0~N~0~ClS~0~ \[M + H\]^+^ 000.00000, found 000.00000.  *(0-(ethylthio)-0,0,0-oxadiazol-0-yl)methyl 0-chlorobenzenesulfonate* (**0a-00**). White liquid; yield, 00.0%; ^0^H NMR (000 MHz, CDCl~0~) δ 0.00--0.00 (m, 0H, Ar-H), 0.00--0.00 (m, 0H, Ar-H), 0.00 (s, 0H, -CH~0~-), 0.00 (q, *J* = 0.0 Hz, 0H, -CH~0~-), 0.00 (t, *J* = 0.0 Hz, 0H, -CH~0~). ^00^C NMR (000 MHz, CDCl~0~) δ 000.00, 000.00, 000.00, 000.00, 000.00, 000.00, 00.00, 00.00, 00.00. HRMS calculated for C~00~H~00~O~0~N~0~ClS~0~ \[M + H\]^+^ 000.00000, found 000.00000.  *(0-(ethylthio)-0,0,0-oxadiazol-0-yl)methyl 0-bromobenzenesulfonate* (**0a-00**). White liquid; yield, 00.0%; ^0^H NMR (000 MHz, CDCl~0~) δ 0.00 (d, *J* = 0.0 Hz, 0H, Ar-H), 0.00 (d, *J* = 0.0 Hz, 0H, Ar-H), 0.00 (s, 0H, -CH~0~-), 0.00 (q, *J* = 0.0 Hz, 0H, -CH~0~-), 0.00 (t, *J* = 0.0 Hz, 0H, -CH~0~). ^00^C NMR (000 MHz, CDCl~0~) δ 000.00, 000.00, 000.00, 000.00, 000.00, 000.00, 00.00, 00.00, 00.00. HRMS calculated for C~00~H~00~O~0~N~0~BrS~0~ \[M + H\]^+^ 000.00000, found 000.00000.  *(0-((0-fluoroethyl)thio)-0,0,0-oxadiazol-0-yl)methyl 0-fluorobenzenesulfonate* (**0a-00**). White liquid; yield, 00.0%; ^0^H NMR (000 MHz, Acetone-*d~0~*) δ 0.00 (dd, *J* = 0.0, 0.0 Hz, 0H, Ar-H), 0.00 (t, *J* = 0.0 Hz, 0H, Ar-H), 0.00 (s, 0H, -CH~0~-), 0.00 (t, *J* = 0.0 Hz, 0H, -CH-), 0.00 (t, *J* = 0.0 Hz, 0H, -CH-), 0.00 (t, *J* = 0.0 Hz, 0H, -CH-), 0.00 (t, *J* = 0.0 Hz, 0H, -CH-).^00^C NMR (000 MHz, Acetone-*d~0~*) δ 000.00 (d, *J* = 000.0 Hz), 000.00, 000.00, 000.00 (d, *J* = 0.0 Hz), 000.00 (d, *J* = 00.0 Hz), 000.00 (d, *J* = 00.0 Hz), 00.00 (d, *J* = 000.0 Hz), 00.00, 00.00 (d, *J* = 00.0 Hz). ^00^F NMR (000 MHz, 