title: Efficient bulky phosphines for the selective telomerization of 1,3-butadiene with methanol.
abstract: A series of bulky phosphines containing substituted biphenyl, 2-methylnaphthyl, or 2,7-di-tert-butyl-9,9-dimethylxanthene moiety were prepared. They were used in the preparation of new monophosphine-palladium(0)-dvds complexes, which were employed as catalysts for the selective telomerization of 1,3-butadiene with methanol to obtain 1-methoxyocta-2,7-diene (1-MOD), the key intermediate in the Dow 1-octene process. Several ligands showed improved selectivity and yield compared to that of the benchmark ligand PPh(3). Especially 2,7-di-tert-butyl-9,9-dimethylxanthen-4-yl-diphenylphosphine (4, "mono-xantphos") stands out as an excellent ligand in terms of yield, selectivity, and stability.
authors.affiliation: Institute of Chemical Research of Catalonia (ICIQ), Avinguda Paisos Catalans, 16, 43007 Tarragona, Spain.
authors.forename: Mathieu J-L
authors.initials: MJ
authors.lastname: Tschan
authors.forename: Eduardo J
authors.initials: EJ
authors.lastname: García-Suárez
authors.forename: Zoraida
authors.initials: Z
authors.lastname: Freixa
authors.forename: Hélène
authors.initials: H
authors.lastname: Launay
authors.forename: Henk
authors.initials: H
authors.lastname: Hagen
authors.forename: Jordi
authors.initials: J
authors.lastname: Benet-Buchholz
authors.forename: Piet W N M
authors.initials: PW
authors.lastname: van Leeuwen