Right- and left-handed circularly polarized light (CPL) has been proposed as one of the origins homochirality biomolecules. However, enantiomeric excess induced by CPL only very low (<2% ee). We found unprecedented example asymmetric autocatalysis triggered directly a chiral physical factor, that is, right- CPL, leading to near enantiopure compound. Asymmetric photolysis racemic pyrimidyl alkanol r-CPL irradiation followed affords (R)-pyrimidyl with >99.5% ee. On other hand, l-CPL...

Straightforward substitution: An excellent combination of a silyl nucleophile and indium catalyst was used to accomplish the dehydroxylation/alkylation alcohols under nearly neutral conditions (see scheme, Si=silyl group) even though this type reaction usually requires at least an equimolar amount acid. Supporting information for article is available on WWW http://www.wiley-vch.de/contents/jc_2002/2004/z53121_s.pdf or from author. Please note: The publisher not responsible content...

Abstract In this paper we describe a method for modeling and rendering dynamic behavior of fluids withsplashes foam. A particle system is built into fluid simulation to represent an ocean wavecresting spraying over another object. We use the Cubic Interpolated Propagation (CIP) asthe solver. The CIP can solve liquid gas together in framework dynamicsand has high accuracy case relatively coarse grids. This enables us simulate ashort time motion splashes air that associated with well.The foam...

The combination of InCl3 and Me3SiBr provided an enhanced Lewis acid system that can be used to promote a wide range direct coupling reactions between alcohols silyl nucleophiles in non-halogenated solvents, such as hexane or MeCN. acidity this was measured by the 13C NMR terms coordination alcohol. Moreover, interaction In(III) species revealed 29Si spectral analysis. Highly chemoselective allylations toward hydroxyl moiety over ketone acetoxy ones have been demonstrated.

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHighly Enantioselective Synthesis Induced by Chiral Primary Alcohols Due to Deuterium SubstitutionItaru Sato, Daisuke Omiya, Takahiro Saito, and Kenso SoaiView Author Information Department of Applied Chemistry Faculty Science, Science University Tokyo Kagurazaka, Shinjuku-ku, Tokyo, 162-8601 Japan Cite this: J. Am. Chem. Soc. 2000, 122, 47, 11739–11740Publication Date (Web):November 10, 2000Publication History Received11 August 2000Published...

Effects of WC grain size, Co content and Cr3C2 addition WC-Co based cemented carbides on tensile fatigue property were investigated because repetitive stress often causes fracture impact punches. To determine loads for measuring property, strength each carbide was measured. Fatigue evaluated by number times until the several at grade carbide. The specimens broken into two in a small high stress. not numbers 107 decreasing to 30-50 % strength. Fining size WC, optimized adopting increased same

Abstract This study investigated R‐ curve behavior when a crack extended several 100 nm for Y 2 O 3 –Al doped Si N 4 ceramics, using single‐edge notched microcantilever beam specimens. The serrate or sawtooth was observed around the maximum load of load‐displacement diagram, indicating repetition initiation and arrest. toughness plots with extension from diagram resulted in rising R ‐curve fitting into one smooth line, which showed 1.4 MPa m 1/2 increase during equivalent to one‐grain...

This paper describes VHD (very high definition) image media competing in spatial resolution with the familiar film as a new digital concept, and discusses problem of acquisition key technology for achieving systems. Towards development system, work presents signal-processing based approach using multiple different cameras. The approach, processing integrating images taken simultaneously cameras, produces an improved sufficiently signal-to-noise ratio. Theoretical analysis experimental...

Indium halides or bismuth catalyzed the coupling of various alcohols with alkenylsilanes to give corresponding alkenes stereospecifically without any other activators.

As defined by the Society of Automotive Engineers (SAE), drivers are required to resume control from an automated driving system (ADS) in Level 2 and 3 when requested system. For example, driver must manual functional limitations ADS approaching or have reached. In addition, he she may also whenever he/she realizes limits approaching, malfunction is imminent. such cases, it necessary smoothly transfer driver, even immediate steering actions needed. Accordingly, this research proposes a...

Mechanical forces are critical for regulating many biological processes such as cell differentiation, proliferation, and death. Probing the continuously changing molecular force through integrin receptors provides insights into mechanism of rigidity sensing in cells; however, information is still limited. Here, we built a coil-shaped DNA origami (DNA nanospring, NS) sensor that reports dynamic motion single integrins well magnitude orientation living cells. We monitored extension with...

A fabrication technique for high-quality AlN templates using only metalorganic vapor phase epitaxy, which involves a tiny-pit layer optimized by changing the growth temperature and V/III ratio, is proposed. Combining with main can be beneficial achieving epitaxial lateral overgrowth reducing threading dislocation density (TDD). According to transmission electron microscopy observations, TDD in on was 7.3 × 109 cm–2, further reduced 2.6 108 cm–2 adopting multiple layers. Tiny voids were...

Research Article| January 01, 2001 Temporal variation in the wavelength of hummocky cross-stratification: Implications for storm intensity through Mesozoic and Cenozoic Makoto Ito; Ito 1Department Earth Sciences, Chiba University, 263-8522, Japan Search other works by this author on: GSW Google Scholar Asako Ishigaki; Ishigaki 2Graduate School Science Technology, Toru Nishikawa; Nishikawa Takahiro Saito Geology (2001) 29 (1): 87–89....

Direct Csp3-Csp3 coupling of various aliphatic trimethylsilyl ethers and allylsilanes is effectively catalyzed by InCl3 I2. The transformation thought to involve an in situ-derived combined Lewis acid Me3SiI. reaction can be used for the construction quaternary-quaternary quaternary-tertiary carbon-carbon bonds. This system enabled a highly chemoselective conducted with ether including aryl halide moiety. Furthermore, couplings were possible using alkynyltrimethylsilane ketene acetal.

Sei nicht sauer! Ein Silylnucleophil kombiniert mit einem Indiumkatalysator wurde zur Dehydroxylierung/Alkylierung von Alkoholen unter fast neutralen Bedingungen eingesetzt (siehe Schema). Üblicherweise erfordert dieser Reaktionstyp äquimolare Mengen an Säure.

The ellipsoidal mirror is an ideal soft X-ray focusing optic that enables achromatic and highly efficient to a nanometer spot size; however, high-quality surface necessary for focusing. Knowledge of the required figure accuracy important fabrication. In this paper, we analyze effects errors on performance through wave-optical calculations based Fresnel–Kirchhoff diffraction theory, assuming coherent X-rays. Figure are classified into three types from viewpoint manufacturing. effect alignment...