Zobrazeno 1 - 10 of 11 pro vyhledávání: '"David C. Neill"'
1
Stereochemistry of polymethylated β,β′-dibromoethers formed by bromination of alkene–epoxide mixtures
Autor: David C. Neill, Susan E. Thomas
Publikováno v: J. Chem. Soc., Perkin Trans. 1. :2620-2622
Examination of β,β′-dibromoethers formed when bromine is added to alkene–epoxide mixtures in pentane at –78 °C revealed that opening of the bromonium ion and the epoxide occurs under high stereochemical control, whilst approach of the epoxid
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::946fdc39f55cb280223d7620386f30e4
https://doi.org/10.1039/p19900002620
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2
Stereochemical effects in mass spectrometry: preferential formation of bromonium ions from trans-substituted 1,1′,2,2′-polyalkyl-2,2′-dibromodiethyl ethers
Autor: Michael J. Harrison, Susan E. Thomas, Richard D. Bowen, David C. Neill
Publikováno v: J. Chem. Soc., Chem. Commun.. :1346-1347
The relative abundance of bromonium ions in the electron ionisation mass spectra of acyclic 1,1′,2,2′-polyalkyl-2,2′-dibromodiethyl ethers is enhanced by trans stereochemistry of the alkyl groups.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::48a3aa05d8ee0acd2e56bcd35ad6e4a6
https://doi.org/10.1039/c39910001346
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3
Dynamic stereochemistry of imines and derivatives. Part 11. Synthesis and stereochemistry of (E)- and (Z)-nitrones
Autor: W. Brian Jennings, David C. Neill, Derek R. Boyd, Johannes Bjørgo
Publikováno v: J. Chem. Soc., Perkin Trans. 1. :254-259
A range of hindered nitrones [ArCR:N(O)R′; R = H or alkyl] has been synthesized and their stereochemistry has been assigned. The relative proportions of (E)- and (Z)-nitrone isomers at equilibrium were found to be both substituent- and solvent-depe
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4037aeec2bc91ac7436371d6b2c3a98e
https://doi.org/10.1039/p19770000254
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4
Dynamic stereochemistry of imines and derivatives. Part VI. Stereochemistry of the peroxyacid–imine route to oxaziridines
Autor: Derek R. Boyd, W. Brian Jennings, David C. Neill, Chris Watson
Publikováno v: J. Chem. Soc., Perkin Trans. 2. :1813-1818
The stereochemistry of the peroxyacid oxidation of N-alkyl-aldimines and -ketimines to oxaziridines containing a stable nitrogen pyramid is considered over a range of reaction conditions. The possible relevance of reactant and product molecular geome
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bc38d82ede865956ea8318b3a3aef6dd
https://doi.org/10.1039/p29750001813
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6
Photoracemization at a chiral pyramidal nitrogen centre
Autor: Johannes Bjørgo, Rose M. Campbell, David C. Neill, Derek R. Boyd
Publikováno v: J. Chem. Soc., Chem. Commun.. :162-163
The absorption of u.v. light by chiral oxaziridines having a stable pyramidal nitrogen configuration results in photoracemization via a mechanism involving C–O bond cleavage and a nitrone intermediate.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bcfa09ec5edcf52fd45173d26799a293
https://doi.org/10.1039/c39760000162
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7
Configurationally stable E–Z-aldonitrones
Autor: Derek R. Boyd, David C. Neill, Johannes Bjørgo
Publikováno v: J. Chem. Soc., Chem. Commun.. :478-479
The elusive E-isomer of aldonitrones was formed in two independent kinetically controlled reactions; the observation of both the E- and the Z-aldonitrones at equilibrium, and their subsequent separation, permitted an estimation of rotational barriers
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9f71128762267affcbb27028a44e6c17
https://doi.org/10.1039/c39740000478
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8
Thermal elimination reactions of nitrones. Part 2. A mechanistic study based on substituent and solvent effects
Autor: David C. Neill, Derek R. Boyd, Michael E. Stubbs
Publikováno v: Journal of the Chemical Society, Perkin Transactions 2. :30
The rates of thermal elimination of isobutene from a series of N-(diarylmethylene)-t-butylamine N-oxides have been measured by u.v. spectroscopy. Activation parameters derived for N-(fluoren-9-ylidene)-t-butylamine N-oxide in decalin and t-butyl alco
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1e1a2ef93418b229ac38b4d544edb9a2
https://doi.org/10.1039/p29780000030
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9
Thermal elimination reactions of nitrones. Part 1. Applications, limitations, and stereochemistry
Autor: David C. Neill, Derek R. Boyd
Publikováno v: Journal of the Chemical Society, Perkin Transactions 1. :1308
A series of N-(fluoren-9-ylidene)alkylamine N-oxides has been synthesised by direct oxidation of the parent imines with peroxy-acid. Most of these nitrones underwent a thermal elimination reaction (analogous to the Cope elimination of tertiary amine
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::630e2bd7349d625386118424a50d7033
https://doi.org/10.1039/p19770001308
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10
Dynamic stereochemistry of imines and derivatives. Part 18. Photosynthesis and photoracemization of optically active oxaziridines
Autor: Rose M. Campbell, Derek R. Boyd, W. Brian Jennings, David C. Neill, James Grimshaw, Peter B. Coulter
Publikováno v: Journal of the Chemical Society, Perkin Transactions 1. :849
Optically active oxaziridines have been synthesized with a maximum optical yield of 31% by photoisomerization (λ > 300 nm) of achiral aldo- and keto-nitrones in the presence of the chiral solvent (+)-(S) or (–)-(R)-2,2,2-trifluoro-1-phenylethanol.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4733906f3824ac2187a6d263aa833594
https://doi.org/10.1039/p19850000849
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