Abstract
Symmetric bis-spiropyrans have been synthesized by the reaction of 5-[2-(3-formyl-4-hydroxyphenyl)ethynyl]-2-hydroxybenzaldehyde, which had previously been prepared by a palladium-catalyzed reaction of 2-hydroxy-5-iodo-benzaldehyde and 5-ethynyl-2-hydroxybenzaldehyde, with 2 equiv. of Fischer's bases. Non-symmetric bis-spiropyrans were synthesized by palladium-catalyzed reaction of 6-iodospiropyrans with 6-ethynylspiropyrans, which had been prepared by reaction of 2-hydroxy-5-iodobenzaldehyde with 1 equiv. of Fischer's base, and the reaction of 5-ethynyl-2-hydroxybenzaldehyde with 1 equiv. of Fischer's base respectively. The bis-spiropyrans obtained were characterized by 1H NMR, IR spectroscopy, UV and GC-MS.
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