NCS
COCl2
PCl3
CCl4 or C2Cl6
HCl/oxidant†
SOCl2
PH3PCl2
PCl5
NaClO3
TosCl/MesCl
HBr
TCCA
nBu4NCl
POCl3
NaDCC
NaCl/KCl
LiCl
DCDMH
NaCl/oxidnant†
Cl2/oxidant†
(COCl)2