Oxford University Press (OUP)
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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
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
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
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...
Fluoranthocyanine: A New Member of the Phthalocyanine Family
Oxford University Press (OUP) - Tập 27 Số 5 - Trang 423-424 - 1998
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
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
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
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...
1H NMR Study of Hydroxy Groups in Mesoporous Molecular Sieve SBA-15
Oxford University Press (OUP) - Tập 30 Số 11 - Trang 1164-1165 - 2001
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
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.
Selective Electrochemical Response of Dopamine against 3,4-Dihydroxyphenylacetic Acid at Bare Indium–Tin Oxide Electrode
Oxford University Press (OUP) - Tập 34 Số 8 - Trang 1120-1121 - 2005
Abstract Electrochemistry of dopamine and 3,4-dihydroxyphenylacetic acid at ITO
were investigated. The oxidation of dopamine significantly depended on pH and
supporting electrolyte. The peak current increased more than one hundred folds
with increasing pH from 2.5 to 10.0 in phosphate buffer. Moreover, selective
oxidation of dopamine against 3,4-dihydroxyphenylacetic acid at bare ITO was
observed....
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