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