title: Metallic macrocycle with a 1,3-alternate calix[4]arene phosphorus ligand.
abstract: The preparation of an 1,3-alternate calix[4]arene phosphorus ligand, 25,27-bis(2-(diphenylphosphino)ethoxy)-26,28-bis(1-propyloxy)calix[4]arene (3), is presented. Ligand 3 is obtained in three steps in 64% overall yield. Reaction of 3 with [Rh(cot)2]BF4 produced the encapsulated rhodium complex [Rh[(P,P)-diphen-calix[4]arene]]BF4 (4). As revealed by a single-crystal X-ray diffraction study, the rhodium center has a bent coordination environment with a P-Rh-P angle of 135.66(3) degrees. Palladation of 3 employing [Pd(MeCN)4](BF4)2 yielded the chelate palladium complex 7 in which the palladium center has a slightly bent configuration. Treatment of the ligand with Pd(cod)Cl2 and [Pd(eta3-C4H7)(THF)2]BF4 leads to the isolation of the monometallic complex. Full characterization includes X-ray structural studies of compounds 3, 4, and 6.
authors.affiliation: Department of Chemistry, Korea University, Chochiwon, Chungnam 339-700, Korea.
authors.forename: Sanghoon
authors.initials: S
authors.lastname: Kim
authors.forename: Jong Seung
authors.initials: JS
authors.lastname: Kim
authors.forename: Ok Jae
authors.initials: OJ
authors.lastname: Shon
authors.forename: Shim Sung
authors.initials: SS
authors.lastname: Lee
authors.forename: Ki-Min
authors.initials: KM
authors.lastname: Park
authors.forename: Sang Ook
authors.initials: SO
authors.lastname: Kang
authors.forename: Jaejung
authors.initials: J
authors.lastname: Ko