• For example of use in the generation of dichlorocarbene under phase-transfer catalysis, see: Org. Synth. Coll., 7, 12 (1990). See also Bromoform, A11904.
• In the presence of base, phenols undergo formylation predominantly in the ortho-position, to give salicylaldehyde derivatives (the Reimer-Tiemann reaction). The mechanism probably involves dichlorocarbene, and yields are generally rather low. For an example, see: Org. Synth. Coll., 3, 463 (1955); review: Org. React., 28, (1982). Improved procedures have been reported: Synth. Commun., 18, 2095 (1988); and, using ultrasound: Synth. Commun., 20, 609 (1990); for an example, see 4-Chlorophenol, A15602.