Abstract
Exposure of 1a to MsCl in the presence of Et 3 N, followed by treatment with H 2 O provided anthracene and phenanthrene derivatives 4 and 5 in an (1:1) product ratio via 1,6-didehydro[10]annulene intermediate. Under the same conditions 2a gave naphthalene derivative 6 in 9% yield via ene-yne-allene intermediate. These transformation could be explained by the rapid diradicalforming cycloaromatization. 1a reacted with MsCl in the presence of Et 3 N, followed by treatment with H 2 O to give 4 and 5 in an (1:1) product ratio. Under the same conditions, 2a gave 6 in 9% yield. Both reactions proceed via diradical intermediates.
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