title: Contribution to the study of the mechanism of directed remote-metalation. Evidence for the intermediacy of a geminal dimetallo dialkoxide C(OM)2 (M = Li, K), first doubly charged director of ortho metalation.
abstract: The mechanism of the metalation of 2-biphenyl carboxylic acid (1) with the Lochmann-Schlosser superbase was determined by deuteriolysis. Both ortho (C(3)) and remote (C(2')) positions are metalated. The C(2')-metalated species 2 cyclizes instantaneously. Under suitable conditions, the doubly charged geminal dimetallo dialkoxide group C(OM)(2) 4 directs metalation in the adjacent position (C(1)), affording a stable 1-metallo-9H-fluorene-9,9-dimetallo dialkoxide 5 that can be trapped by diverse electrophiles to give 1-substituted 9H-fluoren-9-ones 7 and 9 after acidic workup. [structure: see text]
authors.affiliation: Université du Maine and CNRS, Unité de Chimie Organique Moléculaire et Macromoléculaire (UMR 6011), Faculté des Sciences, avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France.
authors.forename: David
authors.initials: D
authors.lastname: Tilly
authors.forename: Subhendu S
authors.initials: SS
authors.lastname: Samanta
authors.forename: Asish
authors.initials: A
authors.lastname: De
authors.forename: Anne-Sophie
authors.initials: AS
authors.lastname: Castanet
authors.forename: Jacques
authors.initials: J
authors.lastname: Mortier