152365-47-4Relevant academic research and scientific papers
New photochromic 2,2-diphenyl-[2H]-chromenes annellated with nitrogenated six-membered ring
Pozzo,Lokshin,Guglielmetti
, p. 75 - 78 (1994)
New photochromic 2,2-diphenyl-[2H]-chromenes 1-6 annellated with nitrogenated six-membered ring have been synthetized by optimized reaction of suitable metal phenolates and β-phenyl cinnamaldehyde. All compounds exhibit photochromic behavior at room tempe
Effect of the type of linkage between phenyl groups on the structure and photochemical properties of 2,2-diaryl-substituted pyridoannelated [2H]-chromenes
Aldoshin,Chuev,Filipenko,Utenyshev,Harie,Lokshin,Samat,Guglielmetti,Pepe
, p. 1098 - 1104 (1998)
Three 2,2-diaryl-substituted pyridoannelated [2H]-chromenes have been studied by X-ray diffraction analysis. Bonding of the benzene rings through bridges of different nature and with different length affects substantially the orientation of the benzene rings, steric interactions at the C center, the conformation of the molecule, and the C-O bond length. A correlation between the photocolorability of chromenes under study and the orientation of the benzene rings with respect to the C-O bond, which provides different prerequisites to stabilization of the C(1)-centered cation formed upon cleavage of the C-O bond, was established. The effect of the orientation of the benzene rings on the dark reaction of ring closure was found.
