Benzopyrans

About: Benzopyrans is a research topic. Over the lifetime, 694 publications have been published within this topic receiving 8830 citations.

Novel substituted naphthopyrans

Abstract: Described are novel reversible photochromic naphthopyran compounds, examples of which are compounds having a cycloalkyl ester substituent at the number 5 carbon atom and optionally certain substituents at the number 6 carbon atom of the naphtho portion of the naphthopyran and certain substituents at the 2-position of the pyran ring. Substituents may also be present at the number 7, 8, 9 or 10 carbon atoms of the naphtho portion of the naphthopyran. These compounds may be represented by the following graphic formulae: Also described are various substrates, e.g., paper, glass, organic polymeric materials, etc., that contain or that are coated with such compounds. Optically clear articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., certain other naphthopyrans, indenonaphthopyrans, benzopyrans, oxazine-type compounds, etc., are also described.

4H-1-benzopyrans and lubricant compositions containing same

Abstract: 4H-1-Benzopyrans are prepared by reacting an aminomethylphenol with an alkali metal hydroxide or an alkaline earth metal hydroxide and a 1,3-diketone. The products are useful as antioxidants.

2-methyl-2'-hydroxymethyl-6-amido benzopyrans derivatives and pharmaceutically acceptable salt thereof, method for preparation, pharmaceutical composition for inhibiting oxidative stress and its use using them

Abstract: A pharmaceutical composition for inhibiting oxidative stress is provided to treat Alzheimer's diseases and cerebral apoplexy by using a 2-methyl-2'-hydroxymethyl-6-amidobenzopyran derivative and its salts. A pharmaceutical composition for inhibiting oxidative stress comprises a 2-methyl-2'-hydroxymethyl-6-amidobenzopyran derivative represented by the formula 1. A method for manufacturing the 2-methyl-2'-hydroxymethyl-6-amidobenzopyran derivative consists of the following steps of manufacturing a 6-amino benzopyran derivative represented by the formula 3 by reducing a 6-nitrobenzopyran derivative represented by the formula 2 with 1.0-3.0 mole equivalent of reductant.