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A new strategy for the synthesis of chromans and chromenes

✍ Scribed by David W. Knight; Paul B. Little

Book ID
108386843
Publisher
Elsevier Science
Year
1998
Tongue
French
Weight
262 KB
Volume
39
Category
Article
ISSN
0040-4039

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Pi= Swern-type oxidation of various 7-halogenobicyclo[4.l.O]heptane-2,3-or -3,4- 10 s affords the corresponding bicyclic diketones which undergo in situ ring expansion and loss of hydrogen halide to give a-tropolones in high yieme quantitative conversion of the isolable 1,4-diketone 26 into the y-tr