Yoshinori Yamanoi

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMethylene-Bridged P-Chiral Diphosphines in Highly Enantioselective ReactionsYoshinori Yamanoi and Tsuneo ImamotoView Author Information Department of Chemistry, Faculty of Science, Chiba University, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan Cite this: J. Org. Chem. 1999, 64, 9, 2988–2989Publication Date (Web):April 10, 1999Publication History Received26 January 1999Published online10 April 1999Published inissue 1 April 1999https://pubs.acs.org/d

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDynamic Assembly of Coordination Boxes from (en)Pd(II) Unit and a Rectangular Panel-Like Ligand: NMR, CSI-MS, and X-ray StudiesYoshinori Yamanoi, Youichi Sakamoto, Takahiro Kusukawa, Makoto Fujita, Shigeru Sakamoto, and Kentaro YamaguchiView Author Information Department of Applied Chemistry Graduate School of Engineering Nagoya University and CREST, Japan Science and Technology Corporation (JST) Chikusaku, Nagoya 454-8603, Japan Coordination Che

[Reaction: see text]. A palladium-catalyzed direct trialkylsilyl transfer to aryl halides has been developed. In the presence of Pd(t-Bu3P)2 and K3PO4, electron-rich para- or meta-substitute aryl iodides were coupled efficiently with triethylsilane, triphenylsilane, and dimethylphenylsilane to afford the corresponding silylated products in moderate to good yields.

We have developed a convenient and efficient approach to the arylation of tertiary silanes under mild conditions. A variety of arylsilanes were synthesized in a one-step process with good to excellent yields in the presence of a rhodium catalyst with a base. The reaction was highly solvent dependent, and amides were the most effective of the various solvents used. This common catalyst system is highly tolerant of the various sensitive functional groups on the substrates, which might be difficult

ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPreparation of Enantiopure 2,2,5,5-Tetramethyl-3,4-hexanediol and Its Use in Catalytic Enantioselective Oxidation of Sulfides to SulfoxidesYoshinori Yamanoi and Tsuneo ImamotoView Author Information Department of Chemistry, Faculty of Science, Chiba University, Yayoi-cho, Inage-ku, Chiba 263, JapanCite this: J. Org. Chem. 1997, 62, 24, 8560–8564Publication Date (Web):November 28, 1997Publication History Received4 June 1997Published online28 November 1997P

We describe here the preparation of soft crystals using disilanyl macrocycle <b>C4</b> possessing four <i>p</i>-phenylenes circularly connected by four flexible disilane bonds. Single crystals of <b>C4</b> exhibited a reversible thermal single-crystal-to-single-crystal (SCSC) phase transition behavior between two crystal phases accompanied by remarkable mechanical motion (thermosalient effect), as revealed by thermal analyses and X-ray diffraction measurements. Detailed structural analyses impli

The arylation of dihydrosilanes with aryl iodides or heteroaryl iodides in the presence of a palladium catalyst provides the corresponding monohydrosilanes in good to high yield. Moderate to good yields are obtained even in the presence of a variety of reactive functional groups, such as -NH2, -OH, or -CN, without their protection.

A convenient procedure has been developed for the preparation of Group 14 compounds by integrated palladium-catalyzed cross-coupling of aromatic iodides with the corresponding Group 14 hydrides in the presence of a base. The reaction conditions can be applied to the cross-coupling of tertiary, secondary, and primary Group 14 compounds. In most cases, the desired arylated products were obtained in synthetically useful yields. Even in the case of aryl iodides containing OH, NH(2), CN, or CO(2)R gr

The development of disilane-bridged donor-acceptor-donor (D-Si-Si-A-Si-Si-D) and acceptor-donor-acceptor (A-Si-Si-D-Si-Si-A) compounds is described. Both types of compound showed strong emission (λem =ca. 500 and ca. 400 nm, respectively) in the solid state with high quantum yields (Φ: up to 0.85). Compound 4 exhibited aggregation-induced emission enhancement in solution. X-ray diffraction revealed that the crystal structures of 2, 4, and 12 had no intermolecular π-π interactions to suppress the

A series of ω-alkene-1-thiol-stabilized gold nanoparticles were prepared by a wet process and then covalently linked to a hydrogen-terminated silicon(111) surface with Si−C bonds via a thermal hydrosilylation reaction. The modified silicon surfaces were observed mainly by high-resolution scanning electron microscopy (HR-SEM). The HR-SEM images revealed that the gold nanoparticles protected with 2-propene-1-thiol (C3) were covalently bound to the hydrogen-terminated silicon surface, after which t

Six novel donor-acceptor-donor organic dyes containing a Si-Si moiety based on triarylamine functionalities as donor units were prepared by Pd-catalyzed arylation of hydrosilanes. Their photophysical, electrochemical, and structural properties were studied in detail. Most of the compounds showed attractive photoluminescence (PL) and electrochemical properties both in solution and in the solid state because of intramolecular charge transfer (ICT), suggesting these compounds could be useful for el

A σ-π extended aryldisilane, comprising a thienopyrazine group as an acceptor fragment and phenothiazine groups as the donor moiety, has been prepared through the introduction of two Si-Si bridges (compound 1). X-ray diffraction analysis determined the crystal structure of 1, and experimental and theoretical approaches investigated its optical properties. Solvatochromic studies revealed the dual emission of 1 in all solvents tested. Compound 1 also exhibited fluorescence in the solid state upon

The treatment of aryl iodides with tris(trimethylsilyl)silane in the presence of Pd(P(tBu)(3))(2) and the Hünig base leads to the formation of hypersilylated aromatic products in good to excellent yields without cleavage of weak Si-Si bonds under mild conditions.

The modification of flat semiconductor surfaces with nanoscale materials has been the subject of considerable interest. This paper provides detailed structural examinations of gold nanoparticles covalently immobilized onto hydrogen-terminated silicon surfaces by a convenient thermal hydrosilylation to form Si-C bonds. Gold nanoparticles stabilized by omega-alkene-1-thiols with different alkyl chain lengths (C3, C6, and C11), with average diameters of 2-3 nm and a narrow size distribution were us