Optically Active Tetrapyrazinoporphyrazines and Their Circular Dichroism in Monomeric and Dimeric FormsOxford University Press (OUP) -  Tập 27 Số 8  - Trang 851-852 - 1998
Nagao Kobayashi, W. A. Nevin
Abstract
               Metal-free and copper derivatives of tetrapyrazinoporphyrazines containing four (1R)-(−)- or (1S)-(+)-camphor units have been synthesized and their circular dichroism (CD) has been studied: in monomeric state, R and S isomers showed mainly positive and negative CD signs, respectively, while CD pattern in a cofacial dimeric state suggested th......  hiện toàn bộ
 Fluoranthocyanine: A New Member of the Phthalocyanine FamilyOxford University Press (OUP) -  Tập 27 Số 5  - Trang 423-424 - 1998
Nagao Kobayashi, Yuko Yoshikawa, Osamu Ito, H. Bruce Goodbrand, Jim Mayo
Abstract
               Fluoranthocyanine, a phthalocyanine analog fused by four five-membered rings and four 1,8-naphthalene units, has been synthesized and characterized by electronic absorption, magnetic circular dichroism, and fluorescence spectroscopy.
 Isolation and Structure of Magnoloside A, a New Phenylpropanoid Glycoside from Magnolia obovata Thunb.Oxford University Press (OUP) -  Tập 17 Số 1  - Trang 163-166 - 1988
Takashi Hasegawa, Yoshiyasu Fukuyama, Toshihide Yamada, Kazuyuki Nakagawa
Abstract
               Magnoloside A, a novel phenylpropanoid glycoside has been isolated from the MeOH extract of Magnolia obovata and its structure has been elucidated as 3,4-dihydroxy-β-phenyl-ethyl-O-α-l-rhamnopyranosyl-(1→2)-3-O-caffeoyl-β-d-allopyranoside by means of spectroscopic and chemical evidences.
 Enantioselective Syntheses of (+)- and (−)-FrontalinOxford University Press (OUP) -  Tập 16 Số 1  - Trang 41-44 - 1987
Masaki Ohwa, Ernest L. Eliel
Abstract
               (+)- and (−)-Frontalin have been obtained from a chiral 1,3-oxathiane precursor in a short (3-step) synthesis in moderate (70%) enantiomeric excess (e.e.). A longer (6-step) modification gives the two enantiomers in 96% e.e. Overall yields range from 28 to 43%.
 1H NMR Study of Hydroxy Groups in Mesoporous Molecular Sieve SBA-15Oxford University Press (OUP) -  Tập 30 Số 11  - Trang 1164-1165 - 2001
 Lei Shi, Yan Zou, Heyong He
Abstract
               Three types of hydroxy groups, which are attributed to single, hydrogen-bonded and geminal SiOHs in mesoporous molecular sieve SBA-15 are directly and quantitatively observed by 1H ultrafast MAS NMR spectroscopy.
 A New Ternary Compound in Rare Earth-Cobalt-Boron SystemOxford University Press (OUP) -  Tập 1 Số 10  - Trang 875-876 - 1972
Koichi Niihara, Seishi Yajima
Abstract
               A new ternary boride RCo12B6 with a rhombohedral structure was synthesized by arc-melting in R-Co-B system, where R is a rare earth ion. From magnetic measurements, it was found that CeCo12B6 had a Curie temperature at 130°–140°K and exhibited a Curie–Weiss behavior in the paramagnetic region above 140°K.
 Synthesis and Characterization of 3-Aminopropyltriethoxysilane-Modified Superparamagnetic Magnetite NanoparticlesOxford University Press (OUP) -  Tập 33 Số 11  - Trang 1468-1469 - 2004
Xing‐Can Shen, Xiuzhong Fang, Ying‐Hua Zhou, Hong Liang
Abstract
               The aminosilane-modified magnetite nanoparticles were synthesized by the coprecipitation and surface modification with 3-aminopropyltriethoxysilane (APTTS). The superparamagnetic APTTS/Fe3O4 nanospheres with an average diameter of 10 nm were characterized significantly with functional group, well dispersion and stabilization in aqueous fluid......  hiện toàn bộ