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Polystyrene-based Amphoteric Diblock Copolymers with Upper Critical Solution Temperature (UCST) in Aqueous Solutions
Oxford University Press (OUP) - Tập 50 Số 6 - Trang 1114-1117 - 2021
Hirokazu Fukumoto, Thu Thao Pham, Yusuke Shigeta, Shinji Ozoe, Shin‐ichi Yusa
An Improved Synthetic Method for Both Enantiomers of Tricyclo[5.2.1.02,6]deca-4,8-dien-3-one by Means of Chemoenzymatic Dissymmetrization of a meso-Compound
Oxford University Press (OUP) - Tập 22 Số 11 - Trang 1919-1922 - 1993
Masayuki Sato, H. HATTORI, Masayuki Murakami, Chikara Kaneko
Abstract Diels-Alder reaction of cis-1,4-diacetoxy-2-cyclopentene with cyclopentadiene gave a tricyclo[5.2.1.02,6]decene derivative stereoselectiviely. The titled dienone useful for enantioselective synthesis of cyclopentanoids and other natural products has been efficiently prepared from the adduct by means of dissymmetrization with lipase-catalyzed acetylation.
Ruthenium-catalyzed Oxidative Alkenylation of Arenes via Regioselective C–H Bond Cleavage Directed by a Nitrogen-containing Group
Oxford University Press (OUP) - Tập 40 Số 10 - Trang 1165-1166 - 2011
Yuto Hashimoto, Takumi Ueyama, Tatsuya Fukutani, Koji Hirano, Tetsuya Satoh, Masahiro Miura
Abstract Direct alkenylation of 1-phenylpyrazoles with alkenes such as acrylates accompanied by regioselective C–H bond cleavage proceeds efficiently under ruthenium catalysis in the presence of a copper oxidant. The procedure is also applicable to 2-phenylbenzothiazole and benzanilide.
Optically Active Tetrapyrazinoporphyrazines and Their Circular Dichroism in Monomeric and Dimeric Forms
Oxford 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 that R and S isomers stack in left- and right-hand... hiện toàn bộ
Fluoranthocyanine: A New Member of the Phthalocyanine Family
Oxford 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 (−)-Frontalin
Oxford 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%.
Mild, Efficient and Selective Nitration of Anilides, Non-Activated and Moderately Activated Aromatic Compounds with Ammonium Molybdate and Nitric Acid as a New Nitrating Agent
Oxford University Press (OUP) - Tập 29 Số 1 - Trang 48-49 - 2000
Sariah Sana, K. C. Rajanna, M. M. Ali, P. K. Saiprakash
Abstract Ammonium molybdate [Mo(VI)] is operationally simple, environmentally safe and inexpensive reagent. Regioselective nitration of anilides, non-activated and moderately activated aromatic compounds could be afforded by employing ammonium molybdate and nitric acid as mild and effective nitrating agent. This procedure works efficiently under reflux conditions to prepare mononitroderivatives of... hiện toàn bộ
1H NMR Study of Hydroxy Groups in Mesoporous Molecular Sieve SBA-15
Oxford 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 System
Oxford 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.
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