627496-12-2Relevant academic research and scientific papers
Ring transformations of heterocyclic compounds. XXIII [1]. The UV irradiation product of photochromic 2,4,6-triaryl-1 - (spiro[2H-1-benzopyran-2,2′-indoline]-6-yl)pyridinium salts - A phenolate betaine or a pyridinium substituted merocyanine dye?
Zimmermann, Thomas,Brede, Ortwin
, p. 611 - 616 (2003)
The synthesis of the novel 2,4,6-triaryl-1-(spiro [2H- 1-benzopyran-2,2′-indoline]-6-yl)pyridinium perchlorates 4 by reaction of 5-nitrosalicylaldehydes 6 with 1,3,3-trimethyl-2-methyleneindoline (7) to 6-nitrospiro [2H-1-benzopyran-2,2′-indolines] 1, the
