Spiropyrans and Spirooxazines. Part 3. Synthesis of Photochromic 5′‐(4,5‐Diphenyl‐1,3‐oxazol‐2‐yl)‐spiro[indoline‐2,3′‐naphtho [2,3‐b]pyran].

Abstract

Photochromic substances T 2200Spiropyrans and Spirooxazines. Part 3. Synthesis of Photochromic 5'-(4,5-Diphenyl-1,3-oxazol-2-yl)-spiro[indoline-2,3'-naphtho[2,3-b]pyran]. -The merocyanine form of title compound (XI) forms intensely colored complexes with bivalent heavy metal ions, e.g., Cu 2+ , Mn 2+ , Ni 2+ , Zn 2+ , and Cd 2+ . -(VOLOSHIN, N. A.; CHERNYSHEV, A. V.; METELITSA*, A. V.; RASKITA, I. M.; VOLOSHINA, E. N.; MINKIN, V. I.; Russ. Chem. Bull. 54 (2005) 3, 705-710; Inst. Phys. Org. Chem., Rostov State Univ., Rostov-on-Don 344090, Russia; Eng.) -D. Singer 08-149

Photochromic and thermochromic spiranes. 34.* synthesis of photochromic 5-(4,5-diphenyl-1,3-oxazol-2-yl)-substituted spirobenzochromeneindolines

“…Yield 51%; mp 213-214°C. The 1 H NMR spectrum of the obtained compound was identical with the spectrum of the compound obtained earlier [17]. …”

“…Instead of the previously described multistage method for the synthesis of the diphenyloxazolylsubstituted aldehyde 3a [17] it is possible to propose a simple and effective method for the synthesis of the aldehydes 3a,b (Scheme 3).…”