title: Ligand-assisted rate acceleration in lanthanum(III) isopropoxide catalyzed transesterification of carboxylic esters.
abstract: The transesterification of an equimolar mixture of carboxylic esters and primary (1°), secondary (2°), and tertiary (3°) alcohols in hydrocarbon solvents was promoted with high efficiency by a lanthanum(III) complex, which was prepared in situ from lanthanum(III) isopropoxide (1 mol %) and 2-(2-methoxyethoxy)ethanol (2 mol %). The present La(III) catalyst was highly effective for the chemoselective transesterification in the presence of competitive 1°- and 2°-amines. Remarkably, esters were obtained in good to excellent yields as colorless materials without an inconvenient workup procedure.
authors.affiliation: Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8603, Japan.
authors.forename: Manabu
authors.initials: M
authors.lastname: Hatano
authors.forename: Yoshiro
authors.initials: Y
authors.lastname: Furuya
authors.forename: Takumi
authors.initials: T
authors.lastname: Shimmura
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Moriyama
authors.forename: Sho
authors.initials: S
authors.lastname: Kamiya
authors.forename: Toshikatsu
authors.initials: T
authors.lastname: Maki
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Ishihara