Tetrahedron Letters p. 1377 - 1380 (1997)
Update date:2022-08-17
Topics:
Gotzhein, Frank
Kirmse, Wolfgang
1,2-H shift is the only intramolecular reaction of 7-(1-propenyloxy)-1-indanylidenes (8) whereas 7-(2-propenyloxy)-1-indanylidene (13) and 7-(2-butenyloxy)-1-indanylidenes (19) undergo addition to the side-chain C=C bond and 1,2-H shifts competitively. Owing to the small RCR bond angle of 1-indanylidenes, the intramolecular chemistry is dominated by the singlet state even if the carbenes are generated by triplet-sensitized photolysis (k(TS) > k(T)).
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