Journal of the Chemical Society. Chemical communications p. 421 - 423 (1990)
Update date:2022-09-26
Topics:
Watanabe, Shigeru
Nakazumi, Hiroyuki
Maeda, Katsumi
Kitao, Teijiro
Novel 4'-styryl spiro<2H-naphtho<2,1-b>pyran-2,2'-2'H-1'-benzothiopyrans> have been prepared by condensation of 2,4-dimethyl-1-benzothiopyrylium perchlorate (1) with 2-hydroxy-1-naphthaldehyde (3) followed by deprotonation with piperidine which gave the coloured form having an absorption band in the near-IR region on UV irradiation.
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