A new route to 4-hydroxytetralones and 1-naphthols
作者:Nigel J. P. Broom、Peter G. Sammes
DOI:10.1039/p19810000465
日期:——
bases, participate in Michael addition reactions with a variety of conjugated olefins. For singly-activated olefins the conjugate anion reacts intramolecularly with the lactone group to produce 4-hydroxytetralones in moderate to good yield. Dehydration of these hydroxytetralones, by brief treatment with acid, produces the corresponding α-naphthol. Substituted phthalides react similarly making the method
Photochemical reactions. Part II. Cycloaddition reactions with photoenols from 2-methylbenzaldehyde and related systems
作者:Barry J. Arnold、Susan M. Mellows、Peter G. Sammes、Timothy W. Wallace
DOI:10.1039/p19740000401
日期:——
On photolysis, 2-methylbenzaldehyde can form the corresponding (E)-photoenol which can be trapped with dienophiles in a highly stereoselective manner. Maleic anhydride gives a single adduct (11), the reactions of which have been studied. From trapping experiments no evidence for the formation of (Z)-photoenol intermediates could be found. Ketones which cannot form (E)-photoenols for steric reasons
Thermal addition reactions to benzocyclobutenones studied by flash photolysis
作者:P. Schiess、M. Eberle、M. Huys-Francotte、J. Wirz
DOI:10.1016/s0040-4039(01)80210-0
日期:1984.1
Ortho-quinoid vinylketenes 2 have been generated through flashphotolysis of benzocyclobutenones 1. A kinetic study of intermolecular addition reactions of 2 competing with the recyclization 2 → 1 reveals strikingly different substituent effects for the addition of methanol and of dienophiles.