Carbon-13 NMR analysis of cyclobutane dimers from benzocycloalkenes

Autor:	T. K. Dobbs, Edmund J. Eisenbraun, P. H. Ruehle, C. E. Browne
Rok vydání:	1979
Předmět:	Cyclobutanes chemistry.chemical_compound Chemistry Chemical shift chemistry.chemical_element General Materials Science General Chemistry Carbon-13 NMR Photochemistry Carbon Medicinal chemistry Spectral line Cyclobutane
Zdroj:	Organic Magnetic Resonance. 12:553-556
ISSN:	1097-458X 0030-4921
DOI:	10.1002/mrc.1270121002
Popis:	13C NMR Spectra for a series of 11 substituted cyclobutanes derived from photodimerization of benzocycloalkenes were recorded. Comparison of the carbon chemical shifts for the head-to-head and head-to-tail cis-syn-cis and cis-anti-cis isomers reveals shielding trends which should facilitate structural and stereochemical assignments for related compounds. The head-to-head isomers show a larger separation of cyclobutane carbon resonances than the head-to-tail isomers. The cis-syn-cis isomers relative to the cis-anti-cis isomers exhibit distinctive upfield shifts of all carbon resonances, except those of aromatic carbons ortho to alkyl-substituted aromatic carbons.
Databáze:	OpenAIRE
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