Preparation of Different Poly 3-Alkylthiophene Ultrathin Films at the Surface of Chemically Adsorbed Monolayer Having Thienyl Group

Polymerization processes of two types ultrathin films containing polythienyl groups anchored to the substrate surface through siloxane bonds were investigated. When the oxidative polymerization on the Chemically Adsorbed (CA) monolayer prepared with 11-(3-thienylundecyl)trichlorosilane (TTS) was performed in the acetonitrile solution containing 3-octylthiophene monomer and FeCl₃, the thienyl groups in the CA monolayer and the outer 3-octylthiophene monomers were polymerized each other along the directions of both in-plane and out-of-plane of the CA monolayer. On the other hand, when the oxidative polymerization was performed without the additive 3-octylthiophene monomer, the long conjugated linkage of the thienyl groups was not formed in the CA monolayer. The highest conductivity of the film prepared with the additive 3-octylthiophene of about 10 nm thickness was 10^?2 S/cm.     

Preparation of 2-Methoxy-3,4-methylenedioxybenzaldehyde (Croweacin Aldehyde) from Pyrogallol

2-Methoxy-3,4-methylenedioxybenzaldehyde (croweacin aldehyde) of high purity was prepared in 55% overall yield from pyrogallol.     

Highly Oxidized States of Phthalocyaninato Terbium(III) Multiple-Decker Complexes Showing Structural Deformations,Biradical Properties and Decreases in Magnetic Anisotropy

Presented here is a comprehensive study of highly oxidized multiple-decker complexes composed of Tb^III and Cd^II ions and two to five phthalocyaninato ligands, which are stabilized by electron-donating n-butoxy groups. From X-ray structural analyses, all the complexes become axially compressed upon ligand oxidation, resulting in bowl-shaped distortions of the ligands. In addition, unusual coexistence of square antiprism and square prism geometries around metal ions was observed in +4e charged species. From paramagnetic ¹H NMR studies on the resulting series of triple, quadruple and quintuple-decker complexes, ligand oxidation leads to a decrease in the magnetic anisotropy, as predicted from theoretical calculations. Unusual paramagnetic shifts were observed in the spectra of the +2e charged quadruple and quintuple-decker complexes, indicating that those two species are actually unexpected triplet biradicals. Magnetic measurements revealed that the series of complexes show single-molecule magnet properties, which are controlled by the multi-step redox induced structural changes.     

Scrambling time from local perturbations of the eternal BTZ black hole

Journal of High Energy Physics - The Goldstone equivalence theorem allows one to relate scattering amplitudes of massive gauge fields to those of scalar fields in the limit of large scattering...     

Molecular Design by Cycloaddition Reactions. VII. Facile Thermal Isomerization in the Reaction of Isopyrazole with Diphenylcyclopropenone

Combination of the diazadiene system with three carbon dienophile in the Diels-Alder reaction would provide a synthesis of seven-membered diazaheterocycles. The reaction of 3,6-disubstituted-1,2,4,5-tetrazines with cyclopropene provides a useful route to 2,5-disubstituted-3,4-diazanorcaradienes and 5H-1, 2-diazepines.² However, in the extensive literature on the Diels-Alder reaction, there are only a few examples of cycloadditions with the azadienes as the 4e components.³

We have examined the reaction of isopyrazole with diphenylcyclo-propenone in the hope of obtaining a convenient synthetic route to the medium-size unsaturated heterocycles. Recently, the reactions of the 4,4-disubstituted isopyrazoles have been indicated to react only with cyclobutadiene⁴ and 4-phenyl-1,2,4-triazoline-3,5-dione as one of the most potent dienophiles.⁵     

Stereochemical study on an oxygen-directed olefin oxidation and subsequent oxygen cyclization: Differences between peracid and metal oxide-catalyzed hydroperoxide in oxidation reactions

Optically active (2S,4R)-2-hydroxy-4-pentyl enol ether was prepared for the first time and subjected to hydroxy-directed oxidations at the olefinic group. Treatment with m-chloroperbenzoic acid and tert-butyl hydroperoxide/vanadium acetylacetonate resulted in the same stereoface differentiation at the olefin, with diastereomeric excesses as high as 79% and 92%, respectively, whereas the stereochemistry of the products of subsequent nucleophilic additions of the hydroxy group was opposite.     

Feasibility studies towards future self-sufficient supply of the 99Mo-99mTc isotopes with Japanese accelerators

In order to establish a self-sufficient supply of ^99mTc, we studied feasibilities to produce its parent nucleus, ⁹⁹Mo, using Japanese accelerators. The daughter nucleus, ^99mTc, is indispensable for medical diagnosis. ⁹⁹Mo has so far been imported from abroad, which is separated from fission products generated in nuclear reactors using enriched ²³⁵U fuel. We investigated ^99mTc production possibilities based on the following three scenarios: (1) ⁹⁹Mo production by the (n, 2n) reaction by spallation neutrons at the J-PARC injector, LINAC; (2) ⁹⁹Mo production by the (p, pn) reaction at E_p = 50–80 MeV proton at the RCNP cyclotron; (3) ^99mTc direct production with a 20 MeV proton beam from the PET cyclotron. Among these three scenarios, scenario (1) is for a scheme on a global scale, scenario (2) works in a local area, and both cases take a long time for negotiations. Scenario (3) is attractive because we can use nearly 50 PET cyclotrons in Japan for ^99mTc production. We here consider both the advantages and disadvantages among the three scenarios by taking account of the Japanese accelerator situation.