• Caution! Theproduct of double lithiation has been reported to explode on drying: Org. Process Res. Dev., 7, 1029 (2003).
• Has been used as a convenient source of the Mannich intermediate: J. Org. Chem., 33, 1719 (1968). For an example (dimethylaminomethyleneation of ferrocene), see: Org. Synth. Coll., 5, 434 (1973). Reaction with o-hydroxy ɑ-aryl acetophenones leads directly to isoflavanones: Synth. Commun., 29, 3895 (1999):