1996
DOI: 10.1002/jlac.199619960221
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Wavelength Control in the Photochemical Addition of Tricyclic [g]‐Fused 1‐Thiocoumarins or Coumarins to Alkenes Yielding Mono‐ and Bis([2 + 2]‐Cycloadducts)

Abstract: On long-wavelength (>395 nm) irradiation in the presence same alkene furnishes mixtures of all bis(photocyc1oad-of 2,3-dimethylbut-2-ene the benzobis(thiin0nes) 6 and 7 af-ducts), of which some were isolated by chromatography and ford 4 : 1 mixtures of cis-and trans-fused monocycloadducts.analyzed by 'H-NMR spectroscopy. -Mixed bis([2 + 21-phoSimilarly, irradiation of thiinobenzopyrandione 8 affords 50 % tocycloadducts) of such molecules become easily accessible, of a 4 : l mixture of cis-and trans-fused monoc… Show more

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Cited by 6 publications
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“…The Margaretha group also investigated the site selectivity in several thiocoumarin-containing bichromophoric compounds. ,,, A few examples 446 – 448 are shown in Figure , with the more reactive bonds toward a [2 + 2] photocycloaddition with 2,3-dimethyl-2-butene being marked.…”
Section: Direct Excitation and Sensitizationmentioning
confidence: 99%
“…The Margaretha group also investigated the site selectivity in several thiocoumarin-containing bichromophoric compounds. ,,, A few examples 446 – 448 are shown in Figure , with the more reactive bonds toward a [2 + 2] photocycloaddition with 2,3-dimethyl-2-butene being marked.…”
Section: Direct Excitation and Sensitizationmentioning
confidence: 99%