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Indexed by: Journal Article

Date of Publication: 2012-01-01

Journal: JOURNAL OF ORGANOMETALLIC CHEMISTRY

Included Journals: EI、SCIE

Volume: 696

Issue: 26

Page Number: 4309-4314

ISSN: 0022-328X

Key Words: Carbon dioxide; 1,3-Butadiene; Palladium catalyst; P,N-Bidentate ligand; delta-Lactone

Abstract: Air-stable P,N-bidentate ligands L1-L7 with cyclic secondary amine moieties linked to the benzene rings of triphenylphosphine were designed and prepared. The chelating coordination mode of the P, N-bidentate ligands to the Pd(II) center was confirmed by determining the X-ray structures of the Pd(II) complexes C1 and C2 derived from ligands L1 and L2, respectively. The ligands were used for the selective synthesis of delta-lactone through the palladium (Pd)-catalyzed telomerization of 1,3-butadiene with carbon dioxide. The highest yield (60% with 79% selectivity) was observed using the Pd-2(dba)(3)/4(2-(diphenylphosphino)phenyl)morpholine (L2) catalyst system. (C) 2011 Elsevier B.V. All rights reserved.