A Facile Access to Substituted 2-Nitrosophenols and 2-NitrophenolsviaRegioselective Nitrosation of Resorcinol Monoethers
摘要:
Solid sodium nitrite in anhydrous propionic acid is an effective system for regioselective nitrosation of the subject compounds. High yields of pure 2-nitroso products are obtained rapidly and efficiently. Attack at the 4-position becomes competitive if water is present in the medium. The 5-alkoxy (but not the 3,5-dialkoxy)-2-nitrosphenols can be easily oxidized with nitric acid to yield the corresponding 2-nitro compounds.
Photochromic compound and articles containing the same
申请人:PPG Industries, Inc.
公开号:US04986934A1
公开(公告)日:1991-01-22
Described are spirobenzoxazine pyrrolo pyridine compounds. Also described is the use of such compounds as photochromic substances in organic host materials such as an organic transparent plastic material, e.g., an ophthalmic lens, to impart a photochromic response thereto.