84196-42-9Relevant articles and documents
EFFECT OF THE INCLUSION OF A CYCLIC FRAGMENT IN THE CHROMOPHORE ON THE PROPERTIES OF A SPIROPYRAN-MEROCYANINE SYSTEM
Gal'bershtam, M. A.,Sidorov, A. P.,Przhiyalgovskaya, N. M.,Strokach, Yu. P.,Barachevskii, V. A.,et. al.
, p. 923 - 928 (2007/10/02)
The corresponding merocyanines, which do not display a tendency to form spiropyran structures, are formed in the condensation of 1,3,3-trimethyl-2-methyleneindoline with 5-methyl-2-furoylacetaldehyde, 2-formylcyclohexanone, or 2-formyl-1-tetralone.Spiran compounds in which the spiropyran-merocyanine equilibrium is shifted markedly to favor the closed form are formed when 4a,9-dimethyl-2,3,4,4a-tetrahydrocarbazone - the cyclic analog of the Fischer base - is used in the reaction with salicylaldehydes and benzoylacetaldehydes.