Thanh Thien Co

Kyungpook National University, Daikyū, Daegu, South Korea

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Publications (6)9.03 Total impact

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    ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
    ChemInform 01/2009; 40(32).
  • Synlett 01/2009; 2009(05):771-774. · 2.66 Impact Factor
  • Thanh Thien Co, Tae-Jeong Kim
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    ABSTRACT: A series of chiral (iminophosphoranyl)ferrocenes (1-3) are highly efficient ligands for Rh- and Ir-catalyzed hydrogenation of a number of unfunctionalized olefins; almost perfect enantiomeric excesses (up to 99% ee) have been achieved under mild reaction conditions.
    Chemical Communications 10/2006; · 6.38 Impact Factor
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    ABSTRACT: A series of new chiral [iminophosphoranyl]ferrocenes, {}Fe{} (1: R = Me, ), {}Fe{} (2: , OMe), and {} (3:R = Ph, ) have been prepared from the reaction of [1,1'-diphenylphosphino-2-(N,N-dimethylamino) ethyl]ferrocene with arylazides (1 & 2) and the reaction of phosphine dichlorides () with [1,1'-diphenylphosphino-2-aminoethyl]ferrocene (3), respectively. They form palladium complexes of the type (4-6: L = 1-3), where the ligand (L) adopts an -P,N (3) as expected. In the case of 1, a potential terdentate, an -P,N mode is realized with the exclusion of the ?=NAr group from the coordination sphere. Complexes 4-6 were employed as catalysts for allylic alkylation of 1,3-diphenylallyl acetate leading to an almost stoichiometric product yield with modest enantiomeric excess (up to 74% ee). Rh(I)-complexes incorporating 1-3 were also prepared in situ for allylic alkylation of cinnamyl acetate as a probe for both regio- and enantioselectivities of the reaction. The reaction exhibited high regiocontrol in favor of a linear achiral isomer regardless of the ligand employed.
    ChemInform 01/2006; 37(7).
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    ABSTRACT: A series of new chiral (iminophosphoranyl)ferrocenes, {η5-C5H4-(PPh2N-2,6-R2-C6H3)}Fe{η5-C5H3-1-PPh2-2-CH(Me)(Y)} (1a, Y = NMe2, R = Me; 1b, Y = NMe2, R = iPr; 1c, Y = OMe, R = iPr), {η5-C5H4-(PPh2N-2,6-R2-C6H3)}Fe{η5-C5H3-1-(PPh2N-2,6-R2-C6H3)-2-CH(Me)(Y)} (2a, R = Me, Y = NMe2; 2b, R = iPr, Y = NMe2,; 2c, R = Me, Y = OMe), and (η5-C5H5)Fe{η5-C5H4-1-PR2-2-CH(Me)NPPh3} (3a, R = Ph; 3b, R = C6H11), have been prepared from the reaction of 1,1‘-bis(diphenylphosphino)-2-[(dimethylamino)ethyl]ferrocene with aryl azides (1 and 2) and the reaction of phosphine dichlorides (R3PCl2) with 1,1‘-bis(diphenylphosphino)-2-(aminoethyl)ferrocene (3), respectively. They form rhodium complexes of the type [Rh(NBD)(L)]ClO4 (4−6; L = 1−3), where the ligand (L) adopts an η2(N,N) (2) or η2(P,N) mode (3), as expected. In the case of 1, a potential tridentate species, however, a chelating bidentate mode through the −CH(Me)NMe2 and −PPh2 groups is realized with the exclusion of the −PNAr group from the coordination sphere, as confirmed by the X-ray crystal structure of [Rh(NBD)(1b)]ClO4 (4b). The new ligands (1−3) exhibit exceptionally high enantioselectivity (up to 99%) and catalytic activity in the Rh-catalyzed asymmetric hydrogenation of (E)-2-methylcinnamic acid, (Z)-2-acetamidocinnamate, and (Z)-2-acetamidoacrylate.
    ChemInform 09/2005; 37(5).
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    ABSTRACT: The reaction of 1,2-ferrocenediylazaphosphinines (1a, R1 = H; 1b, R1 = Me; 1c, R1 = Ph) with M(CO)6 (M = Mo, W), MX(CO)5 (M = Mn, Re; X = Br, Cl), and [Pd(η3-C3H5)Cl]2 shows a strong tendency to adopt an unusual chelating bidentate coordination through nitrogen and the carbonyl oxygen, yielding M(η2-N,O)(CO)4 (2, M = Mo; 3, M = W), M(η2-N,O)(X)(CO)3 (6, M = Mn, X = Br; 7, M = Re, X = Cl), and [Pd(η2-N,O)(η3-C3H5)]BF4 (after treatment with AgBF4) (8), respectively. X-ray crystallographic structure determinations of 3a (R1 = H) and 8a (R1 = H) show the formation of a five-membered metallacycle with the distance of the metal−carbonyl oxygen bond being shorter than that of the metal−nitrogen bond in both compounds. The complexes 2 and 3 further undergo oxidative addition with allyl iodide to yield the corresponding M(II) complexes of the type [M(η2-N,O)( η3-C3H5)(I)(CO)2] (4, M = Mo; 5, M = W). Complexes 2−5 and 8 were employed as catalysts for nucleophilic allylic substitution of allyl acetates as a probe for both regio- and enantioselectivities of the reaction. All reactions involving unsymmetrical allyl acetates (E)-RCHCHCH2OAc (R = Pr, Ph) led exclusively to the formation of achiral linear product (E)-RCHCHCH2Nu regardless of the type of catalysts, the ligand, or the allyl substrate employed. One exception to the above statement is the observation that Mo- and W-based catalysts (2−5) are totally inactive toward the allylic substitution of cinnamyl acetate (R = Ph). Asymmetric allylic alkylation of a symmetrically 1,3-disubstituted substrate, PhCHCHCH(OAc)Ph, is accomplished only by Pd-catalysts (8) with enantiomeric excesses up to 50% ee.
    ChemInform 02/2003; 22(7).