ORCID Profile
0000-0003-2746-6276
Current Organisations
University of Sheffield
,
University of St Andrews
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Publisher: Elsevier BV
Date: 1991
Publisher: Elsevier BV
Date: 1990
Publisher: American Chemical Society (ACS)
Date: 05-2013
DOI: 10.1021/JA402833W
Publisher: Elsevier BV
Date: 1990
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2SC21298F
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3SC50500F
Publisher: Elsevier BV
Date: 06-1992
Publisher: American Chemical Society (ACS)
Date: 09-1991
DOI: 10.1021/JO00019A012
Publisher: Beilstein Institut
Date: 04-06-2013
DOI: 10.3762/BJOC.9.120
Abstract: Sensitised photolyses of ethoxycarbonyl oximes of aromatic and heteroaromatic ketones yielded iminyl radicals, which were characterised by EPR spectroscopy. Iminyls with suitably placed arene or heteroarene acceptors underwent cyclisations yielding phenanthridine-type products from ortho-additions. For benzofuran and benzothiophene acceptors, spiro-cyclisation predominated at low temperatures, but thermodynamic control ensured ortho-products, benzofuro- or benzothieno-isoquinolines, formed at higher temperatures. Estimates by steady-state kinetic EPR established that iminyl radical cyclisations onto aromatics took place about an order of magnitude more slowly than prototypical C-centred radicals. The cyclisation energetics were investigated by DFT computations, which gave insights into factors influencing the two cyclisation modes.
Publisher: Royal Society of Chemistry (RSC)
Date: 1990
DOI: 10.1039/P29900000531
Publisher: American Chemical Society (ACS)
Date: 28-01-2014
DOI: 10.1021/JO4027929
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1CC12720A
Abstract: Oxime carbonates were found to be excellent precursors for the clean and direct generation of iminyl radicals under UV irradiation. Suitably functionalised iminyls underwent cyclisations yielding various phenanthridines and also substituted quinolines and isoquinolines. EPR and X-ray analyses of oxime carbonates provided insight into the mechanism.
Publisher: American Chemical Society (ACS)
Date: 10-08-2012
DOI: 10.1021/JA306168H
Abstract: Under dry, anaerobic conditions, TiO(2) photocatalysis of carboxylic acid precursors resulted in carbon-carbon bond-forming processes. High yields of dimers were obtained from TiO(2) treatment of carboxylic acids alone. On inclusion of electron-deficient alkenes, efficient alkylations were achieved with methoxymethyl and phenoxymethyl radicals. In reactions with maleic anhydride or maleimides, phenoxyacetic acid produced chromenedione derivatives in addition to adducts. These photocatalytic reactions are simple and cheap to perform, and the TiO(2) is easily removed by filtration. The anaerobic photocatalysis strategy offers a range of synthetic possibilities.
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C1RA00909E
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for John Walton.