Tetrahedron Letters p. 7445 - 7446 (1989)
Update date:2022-08-04
Topics:
Kitamura
Takachi
Kawasato
Kobayashi
Taniguchi
Treatment of o-(phenyloxy)phenylalkyne 1 with HC104 or HBF4 gave dibenz [b, f]oxepin 2, whereas the sulfur analogue, o-(phenylthio)phenyl-alkyne 3, provided 1-phenyl 1-1-benzothiophenium salts 4.
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