Computed Properties of C15H12O. Ohashi, K; Kinoshita, Y; Tamiaki, H in [Ohashi, Kota; Kinoshita, Yusuke; Tamiaki, Hitoshi] Ritsumeikan Univ, Grad Sch Life Sci, Kusatsu, Shiga, Japan published Syntheses of Chalcone-Type Chlorophyll Derivatives Possessing a Bacteriochlorin, Chlorin or Porphyrin pi-System and Their Optical Properties in 2019.0, Cited 21.0. The Name is Chalcone. Through research, I have a further understanding and discovery of 94-41-7.
C3-(Trans-2-arylethenyl)carbonylated chlorophyll derivatives possessing a bacteriochlorin or chlorin pi-system were synthesized by cross-aldol (Claisen-Schmidt) condensation of methyl pyrobacteriopheophorbide-a or 3-acetyl-3-devinyl-pyropheophorbide-a bearing the C3-acetyl group with p-(un)substituted benzaldehydes under basic conditions. The corresponding porphyrin-type chlorophyll derivatives were prepared by the oxidation (17,18-didehydrogenation) of the chlorin-type. Their Qy absorption and fluorescence emission maxima in dichloromethane correlated well with Hammett substituent constants of the p-substituents. Several electron-withdrawing p-substituents suppressed the emission due to photoinduced electron transfer quenching in a molecule. The substitution sensitivities for their maxima and fluorescence quantum yields decreased in the order of bacteriochlorin-, chlorin- and porphyrin-type derivatives.
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Reference:
Thiazolidine – Wikipedia,
,Thiazolidine – ScienceDirect.com