• The combination with thionyl chloride (1:1), dissolved in DCM, is a useful and convenient reagent for conversion of alcohols and carboxylic acids to the alkyl or acyl chlorides: Synlett, 1763 (1999).
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For use in the synthesis of indolo[2,3-b]quinolines, see 2-Chloroquinoline, B23443.• For reviews of Katritzky's extensive work on benzotriazoles as versatile synthetic intermediates, see: Tetrahedron, 47, 2683 (1991); Chem. Soc. Rev., 363 (1994) Synthesis, 445 (1994); 1315 (1995).