title: Synthesis and structural characterization of an azatitanacyclobutene: the key intermediate in the catalytic anti-Markovnikov addition of primary amines to [small alpha]-alkynes.
abstract: Reaction of the imidotitanium complexes [Ti(N(t)Bu)(N(2)N(py))(py)](1) and [Ti(N-2,6-C(6)H(3)(i)Pr(2))(N(2)N(py))(py)](2) with phenyl acetylene and tolyl acetylene in toluene gave the corresponding [2+2] cycloaddition products [Ti(N(2)N(py))[kappa(2)-N((t)Bu)CH[double bond]CR]](R = Ph:3, Tol:4) and [Ti(N(2)N(py))[kappa(2)-N(2,6-C(6)H(3)(i)Pr(2))CH[double bond]CR]](R = Ph:5, Tol: 6). Complex 6 is the first example of a key intermediate in the anti-Markovnikov addition of a primary amine to a terminal acetylene which has been structurally characterized by X-ray diffraction.
authors.affiliation: Laboratoire de Chimie Organométallique et de Catalyse, Institut Le Bel, Université Louis Pasteur, Strasbourg, France.
authors.forename: Benjamin D
authors.initials: BD
authors.lastname: Ward
authors.forename: Aline
authors.initials: A
authors.lastname: Maisse-Francois
authors.forename: Philip
authors.initials: P
authors.lastname: Mountford
authors.forename: Lutz H
authors.initials: LH
authors.lastname: Gade