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A facile synthesis of 2,2-disubstituted 5-carbethoxy-2,3-dihydro-4H-pyran-4-ones

✍ Scribed by Nancy I. Totah; Deqi Chen

Publisher
Elsevier Science
Year
1998
Tongue
French
Weight
159 KB
Volume
39
Category
Article
ISSN
0040-4039

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Dedicated to Professor Heinz Heimgartner on the occasion of his 65th birthday On irradiation (350 nm) in benzene solution, dihydropyranone 3 affords predominantly (75%) the cis-anti-cis HH-dimer 4, but in smaller amounts (12%) also dimer 5, wherein one of the six-membered rings is trans-fused to the