Synthesis and study of new photochromic unsymmetrical bis-spiropyrans with nonequivalent heteroarene fragments conjugated through the common 2H,8H-pyrano[2,3-f]chromene moiety
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DOI: 10.1016/j.molstruc.2020.128808
Abstract: Abstract Four novel bis-spiropyrans possessing two different photochromic units based on indoline and 1,3-benzoxazine heterocycles which are connected through the common 2H,8H-pyrano[2,3-f]chromene moiety and modified with electron donating substituents were obtained by multistep synthesis starting… read more here.
Keywords: common pyrano; chromene moiety; bis spiropyrans; moiety ... See more keywords