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Metabolites of the higher fungi. Part 31.1 Longianone, a C7H6O4 spiro bicyclic lactone from the fungus Xylaria longiana (Rehm.)

Autor: Anthony J. S. Whalley, Claire L. Oliver, Michael Stephen Pacey, Raymond L. Edwards, Derek J. Maitland, Len Shields

Publikováno v: Journal of the Chemical Society, Perkin Transactions 1. :715-720

Longianone 1 from Xylaria longiana is identified as 1,7-dioxaspiro[4,4]non-2-ene-4,8-dione by chemical and physical methods. The possible biosynthetic origin is discussed.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::15419fc50ec0e0638add2d17f67e005f
https://doi.org/10.1039/a808845d

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Solid-State Characterization of Chlordiazepoxide Polymorphs

Autor: Peter V. Marshall, Dilraj Singh, Len Shields, Peter York

Publikováno v: Journal of Pharmaceutical Sciences. 87:655-662

A novel crystal form (form II) of the benzodiazepine chlordiazepoxide is reported. The new polymorphic phase was characterized and distinguished from the standard form (form I) by X-ray diffractometry, differential scanning calorimetry, infrared spec

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::983aad5c59c39f93ff81c5e3f07b94d7
https://doi.org/10.1021/js960385c

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FT-Raman spectroscopic investigation of a pseudopolymorphic transition in caffeine hydrate

Autor: E.E. Lawson, M. de Matas, Peter York, Len Shields, H.G.M. Edwards

Publikováno v: Journal of Molecular Structure. 440:97-104

The FT-Raman spectra of caffeine hydrate and anhydrous β-caffeine have been recorded. The accelerated dehydration of the hydrate has been monitored at 30, 35 and 40°C using an environmental chamber. The spectra representing the individual pseudopol

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3dfb4d2601630aa8a43eed6c988bf8a8
https://doi.org/10.1016/s0022-2860(97)00231-7

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Metamorphosis of caffeine hydrate and anhydrous caffeine

Autor: Peter York, Marcel de Matas, E.E. Lawson, Len Shields, Howell G. M. Edwards

Publikováno v: Journal of the Chemical Society, Perkin Transactions 2. :1985-1990

The phase stability, interconversion and physicochemical characterisation of caffeine (1,3,7-trimethylpurine-2,6-dione) hydrate and anhydrous caffeine relate to the strength of the available hydrogen-bonds. A hydrogen-bonded T-branched spine of hydra

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3cb8b7289618a24f2f78d4a524290032
https://doi.org/10.1039/a702041d

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Metabolites of the higher fungi. Part 29. Maldoxin, maldoxone, dihydromaldoxin, isodihydromaldoxin and dechlorodihydromaldoxin. A spirocyclohexadienone, a depsidone and three diphenyl ethers: keys in the depsidone biosynthetic pathway from a member of the fungus genus Xylaria

Autor: Raymond L. Edwards, Len Shields, M. O. Adeboya, Anthony J. S. Whalley, Thomas Lassøe, Derek J. Maitland

Publikováno v: J. Chem. Soc., Perkin Trans. 1. :1419-1425

2-(3′-Chloro-2′-hydroxy-4′-methoxy-6′-methoxycarbonylphenoxy)-6-hydroxy-4-methylbenzoic acid (dihydromaldoxin 1), 2-(3′-Chloro-4′-hydroxy-2′-methoxy-6′-methoxycarbonylphenoxy)-6-hydroxy-4-methylbenzoic acid (isodihydromaldoxin 2), dec

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4bbae25ea642fee52703be75726fe64d
https://doi.org/10.1039/p19960001419

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X-ray crystallographic studies of sterically strained cyclic oligocarbonate precursors for polymerization

Autor: Utai Meekum, Steve A. Dobrowski, Howell G. M. Edwards, Len Shields, Anthony F. Johnson

Publikováno v: Polymer. 35:4707-4711

Crystals of the dimeric and trimeric cyclic oligocarbonates of bisphenol A have been prepared by recrystallization from benzene, and these have been examined by X-ray diffractometry. The trimeric oligomer crystals have been shown to include solvate m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6012613eddc7ae4f43deac6066999177
https://doi.org/10.1016/0032-3861(94)90721-8

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ChemInform Abstract: Metabolites of the Higher Fungi. Part 31. Longianone, a C7H6O4 Spiro Bicyclic Lactone from the Fungus Xylaria longiana (Rehm.)

Autor: Raymond L. Edwards, Derek J. Maitland, Len Shields, Claire L. Oliver, Anthony J. S. Whalley, Michael Stephen Pacey

Publikováno v: ChemInform. 30

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5ada3fcb55ca13ac282b026173962c06
https://doi.org/10.1002/chin.199932097

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Solid-state properties and crystal structure of gliclazide

Autor: Conrad S. Winters, Peter York, Peter Timmins, Len Shields

Publikováno v: Journal of pharmaceutical sciences. 83(3)

The solid-state characterization of gliclazide, for which no analytical standard was previously available, has been completed by extensive structural and physical analytical examination. The crystal and molecular structure for gliclazide was determin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d8086d64ab11a07f9fef9eab323c8760
https://pubmed.ncbi.nlm.nih.gov/8207672

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Critical temperature studies of multiphase oxocuprates

Autor: Len Shields

Publikováno v: Journal of Materials Chemistry. 5:999

An exploratory study of critical temperatures (Tc) in multiphase oxocuprates examines the relation between Tc values and crystal field effects induced by chemical compositional variation. Onset Tc of some yttrium barium and bismuth barium oxocuprates

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::36e46840725a28ce74c77092bfaeeb64
https://doi.org/10.1039/jm9950500999

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