[Cl:1][C:2]1[N:7]=[C:6]([C:8]([OH:10])=O)[CH:5]=[CH:4][CH:3]=1.O=S(Cl)[Cl:13]>>[Cl:1][C:2]1[N:7]=[C:6]([C:8]([Cl:13])=[O:10])[CH:5]=[CH:4][CH:3]=1A mixture of 40 g 6-chloro-2-pyridinecarboxilic acid and 150 ml SOCl2 is refluxed 4 hrs. After removing excess SOCl2 there is obtained 44 g 6-chloro-2-pyridinecarboxylic acid chloride, m.p. 76° C.
Wird geladen…