101
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Ito S, Sekiguchi S, Yoshifuji M. Topochemical [2+2] Dimerization of Kinetically Stabilized 1-Phosphaallenes in the Solid State. European J Org Chem 2003. [DOI: 10.1002/ejoc.200300471] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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102
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Liang H, Nishide K, Ito S, Yoshifuji M. Preparation, properties, and catalytic activity of transition-metal complexes containing a ligated 2-methyl-3,3-diphenyl-1,3-diphosphapropene skeleton. Tetrahedron Lett 2003. [DOI: 10.1016/j.tetlet.2003.09.073] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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103
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Kimura S, Ito S, Yoshifuji M, Veszprémi T. Experimental and theoretical studies on the conjugation of the phosphorus-carbon double bond with a cyclopropyl group. J Org Chem 2003; 68:6820-3. [PMID: 12919058 DOI: 10.1021/jo034648g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
X-ray structural analysis for (Z)-2-cyclopropyl-1-(2,4,6-tri-tert-butylphenyl)-1-phosphaethene (2) was performed to confirm that the cyclopropyl group largely interacts with the P[double bond]C group compared with its carbon analogue, vinylcyclopropane (1). Absorption spectrum and redox properties of 2 were also studied to prove the conjugation. Theoretical investigation for nonsubstituted derivatives (4) indicated conjugative interaction between the P[double bond]C and cyclopropyl groups and revealed the physicochemical similarities between the P=C and C[double bond]C.
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104
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Sugiyama H, Ito S, Yoshifuji M. Synthesis of a 1,3-diphosphacyclobutane-2,4-diyl from Mes*C[triple bond]P. Angew Chem Int Ed Engl 2003; 42:3802-4. [PMID: 12923849 DOI: 10.1002/anie.200351727] [Citation(s) in RCA: 124] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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105
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Sugiyama H, Ito S, Yoshifuji M. Synthesis of a 1,3-Diphosphacyclobutane-2,4-diyl from Mes*CP. Angew Chem Int Ed Engl 2003. [DOI: 10.1002/ange.200351727] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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106
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Toyota K, Kawasaki S, Nakamura A, Yoshifuji M. Preparation and Properties of Sterically Protected Diphosphene and Fluorenylidenephosphine Bearing the 2,6-Di-tert-butyl-4-methoxyphenyl Group. CHEM LETT 2003. [DOI: 10.1246/cl.2003.430] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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107
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Ito S, Kimura S, Yoshifuji M. Preparation, structure, and reaction of a sterically encumbered 1-phosphaallene containing a cyclopropylidene moiety. Org Lett 2003; 5:1111-4. [PMID: 12659586 DOI: 10.1021/ol0341750] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] Sterically protected (Z)-1-(2,4,6-tri-tert-butylphenyl)-2,5-dibromo-1-phosphapent-1-ene was allowed to react with potassium tert-butoxide to afford a cyclopropylidenephosphaethene, which was characterized spectroscopically and by X-ray crystallography. Construction of the cycloalkyl groups and isomerization of 1-phosphapenta-1,2,4-trienes to cyclopropylidenephosphaethenes are also described.
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108
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Ito S, Liang H, Yoshifuji M. Preparation, structure, and some coordination properties of 2-chloro-3,3-diphenyl-3-thioxo-1-(2,4,6-tri-t-butylphenyl)-1,3-diphosphapropene. Chem Commun (Camb) 2003:398-9. [PMID: 12613631 DOI: 10.1039/b211230b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A sterically encumbered 3-thioxo-1,3-diphosphapropene, bearing a P=C-P=S skeleton, was prepared, characterised, and allowed to react with a carbonyltungsten(0) reagent and iodine affording the corresponding chelate tungsten(0) complex and charge-transfer complex with iodine, respectively, which were analysed by the X-ray crystallography.
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109
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Ito S, Kimura S, Yoshifuji M. Preparation and Properties of Kinetically Stabilized Phosphaethene Derivatives Carrying the Methylsulfanyl Group. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2003. [DOI: 10.1246/bcsj.76.405] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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110
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111
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Liang H, Ito S, Yoshifuji M. Preparation, structure and coordination properties of 3,3-bis(diisopropylamino)-3-thioxo-1-(2,4,6-tri-tert-butylphenyl)-1,3-diphosphapropene. Org Biomol Chem 2003; 1:3054-8. [PMID: 14518128 DOI: 10.1039/b305216h] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
(Z)-1-Chloro-2-(2,4,6-tri-tert-butylphenyl)-2-phosphaethenyllithium was allowed to react with bis(diisopropylamino)-phosphenium triflate to afford the corresponding 1,3-diphosphapropene which was converted to 3-thioxo-1,3-diphosphapropene [(Z)-Mes*P = C(Cl)-P(= S)(NiPr2)2]. The coordination properties of 3-thioxo-1,3'-diphosphapropene were investigated with carbonyltungsten(0) and dichloroplatinum(II) reagents, and the molecular structure of the chelate dichloroplatinum(II) complex was unambiguously determined by X-ray crystallography together with the free ligand. The dichloroplatinum(II) complex underwent intramolecular cyclisation involving C-H activation to give a 5,7-di-tert-butyl-3,3-dimethyl-l-(phosphinomethyl)-1-phosphaindane derivative as well.
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112
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Toyota K, Nakamura A, Yoshifuji M. Development of a new sterically protecting auxiliary of the metacyclophane type and application to unsymmetrical diphosphenes, 1,3-diphosphaallene and 1,4-diphosphabutatriene. Chem Commun (Camb) 2002:3012-3. [PMID: 12536792 DOI: 10.1039/b209666h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new bulky bromobenzene of the metacyclophane type was converted to an unsymmetrically substituted 1,4-diphos-phabutatriene whose spin-spin coupling constant (3Jpp) turned out to be larger, for the first time, than the 2Jpp value of the corresponding 1,3-diphosphaallene.
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113
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Sasaki S, Sutoh K, Murakami F, Yoshifuji M. Synthesis, structure, and redox properties of the extremely crowded triarylpnictogens: tris(2,4,6-triisopropylphenyl)phosphine, arsine, stibine, and bismuthine. J Am Chem Soc 2002; 124:14830-1. [PMID: 12475308 DOI: 10.1021/ja027493n] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of the extremely crowded triarylpnitogens, tris(2,4,6-triisopropylphenyl)phosphine (1), arsine (2), stibine (3), and bismuthine (4), were synthesized by the reaction of 2,4,6-triisopropylphenylcopper(I) with the corresponding pnictogen trichlorides. Introduction [corrected] of the three bulky aryl groups resulted in the unusual structures and redox properties, which were studied by X-ray crystallography and cyclic voltammetry. The triarylpnictogens 1, 2, and 3 had extremely large bond angles around pnictogen atoms (1: 111.5 degrees , 2: 109.2 degrees , 3: 106.7 degrees ), and not only 1 and 2, but also stibine 3 displayed a reversible redox wave in the cyclic voltammograms at very low potentials (1: 0.16 V, 2: 0.50 V, 3: 0.57 V vs Ag/Ag+), which suggests considerable stability of the corresponding cation radicals.
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114
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Sasaki S, Aoki H, Sutoh K, Hakiri S, Tsuji K, Yoshifuji M. Synthesis and Redox Properties of Bis{4-[bis(4-methoxyphenyl)amino]-2,6-bis(2,4,6-triisopropylphenyl)phenyl}diphosphene. Helv Chim Acta 2002. [DOI: 10.1002/1522-2675(200211)85:11<3842::aid-hlca3842>3.0.co;2-u] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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115
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Ozawa F, Okamoto H, Kawagishi S, Yamamoto S, Minami T, Yoshifuji M. (Pi-allyl)palladium complexes bearing diphosphinidenecyclobutene ligands (DPCB): highly active catalysts for direct conversion of allylic alcohols. J Am Chem Soc 2002; 124:10968-9. [PMID: 12224930 DOI: 10.1021/ja0274406] [Citation(s) in RCA: 314] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The (pi-allyl)palladium complex bearing an sp2-hybridized phosphorus ligand (DPCB-OMe: 1,2-bis(4-methoxyphenyl)-3,4-bis[(2,4,6-tri-tert-butylphenyl)phosphinidene]cyclobutene) efficiently catalyzes direct conversion of allylic alcohols in the absence of activating agents of alcohols such as Lewis acids. N-Allylation of aniline proceeds at room temperature to afford monoallylated anilines in 90-97% yields. C-Allylation of active methylene compounds is also successful at 50 degrees C using a catalytic amount of pyridine as a base, giving monoallylation products in 85-95% yields. The catalytic mechanism involving hydrido- and (pi-allyl)palladium intermediates has been proposed on the basis of stoichiometric examinations using model compounds of presumed intermediates.
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116
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Ito S, Sugiyama H, Yoshifuji M. Preparation of 2,4-bis(2,4,6-tri-tert-butylphenyl)-1,3-diphosphacyclobutenes from 2-(2,4,6-tri-tert-butylphenyl)-1-phosphaethyne and alkyllithiums. Chem Commun (Camb) 2002:1744-5. [PMID: 12196978 DOI: 10.1039/b204142c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
2-(2,4,6-Tri-tert-butylphenyl)-1-phosphaethyne was allowed to react with 0.5 eq. of alkyllithium to afford 2,4-bis(2,4,6-tri-tert-butylphenyl)-1,3-diphosphacyclobutenes through an intramolecular cyclisation of a 1,3-diphosphabuta-1,3-diene intermediate.
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117
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Sasaki S, Kato K, Tanabe Y, Mori T, Yoshifuji M. Synthesis of Phosphoryl Substituted Acetylenes and Their Reaction with Transition Metal Complexes. PHOSPHORUS SULFUR 2002. [DOI: 10.1080/10426500213425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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118
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Sugiyama H, Ito S, Yoshifuji M. Synthesis and Structure of a Kinetically Stabilized 1,3,6-Triphosphafulvene. PHOSPHORUS SULFUR 2002. [DOI: 10.1080/10426500213341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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119
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Murakami F, Sasaki S, Yoshifuji M. Synthesis, Structure and Redox Properties of Sterically Protected Phosphaquinoid Compounds. PHOSPHORUS SULFUR 2002. [DOI: 10.1080/10426500213330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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120
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Sasaki S, Sutoh K, Murakami F, Yoshifuji M. Construction of Redox System Composed of Crowded Tetraaryldiphosphanes. PHOSPHORUS SULFUR 2002. [DOI: 10.1080/10426500213292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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121
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Kimura S, Ito S, Yoshifuji M. Preparation of Some 1,4-Diphospha-1,3-Butadienes by Oxidative Coupling Reaction. PHOSPHORUS SULFUR 2002. [DOI: 10.1080/10426500213417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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122
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Toyota K, Yamada N, Yoshifuji M. Preparations of Dichloroplatinum(II) Complexes of Some Sterically Protected 3,4-Diphosphinidenecyclobutene Derivatives. PHOSPHORUS SULFUR 2002. [DOI: 10.1080/10426500213404] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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123
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124
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125
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Ito S, Kimura S, Yoshifuji M. Copper-mediated Coupling Reaction of Kinetically Stabilized 1-Methyl-2-phosphaethenyllithiums Involving an Isomerization to a 3-Phospha-2-propenyllithium Derivative. CHEM LETT 2002. [DOI: 10.1246/cl.2002.708] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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