Results 121 to 130 of about 3,127 (182)

Photochromic Mechanism of Heterofused Benzopyran Derivatives

Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 2000
Abstract ABATRACT The photochromic behavior of 2-phenyl-2-(thien-2-yl)-2H-benzo [b]furano[3,2-f]benzopyran (1) and 2,2-diphenyl-2H-benzo[b] furano[3,2-f]benzopyran (2) was examined by the nanosecond laser photolysis and normal time scale analysis. The results showed that the thienyl group could stabilize the colored forms as compared with the phenyl ...
Ping Fan, Jingqiang Wei, Aiping Zhu, Yangfu Ming, M. G. Fan, Wenfeng Wang, Side Yao   +6 more
openaire   +1 more source

A Novel Synthesis of Acetophenone Benzopyran Derivative

Advanced Materials Research, 2010
The development of a novel synthesis of acetophenone benzopyran is reported. A acetophenone benzopyran derivative was prepared from 1-(2,4-dihydroxyphenyl)ethanone (3) through O-prenylation and Lewis acids catalyzed intermolecular cyclization reaction.
Xiao Yan Qi, Lin Wu, Jian Guo Wang, De Lian Yi   +3 more
openaire   +1 more source

Benzopyran derivatives from Melicope pteleifolia

Journal of Asian Natural Products Research
Phytochemical investigation of M. pteleifolia branches and leaves led to the isolation of seven benzopyran derivatives, including five new ones named melicopols A - E (2 - 6). The chemical structures were confirmed by extensive analysis of the 1D, 2D NMR, CD, and HR-QTOF mass spectra. The absolute configuration 1'S of leptol A (1) was firstly confirmed
Pham Thi Cham, Le Thi Vien, Ninh Thi Ngoc, Tran Thi Hong Hanh, Nguyen The Cuong, Nguyen Xuan Cuong, Nguyen Hoai Nam   +6 more
openaire   +2 more sources

New Substituted Derivatives of Benzopyran and Chromone

Synthetic Communications, 1998
Abstract The synthesis of substituted (CN and SR) 2-methylene-benzopyran and 2-methylchromones is described.
Francis Pochat, Paul L'Haridon
openaire   +1 more source

Insights into the Origin and Therapeutic Implications of Benzopyran and Its Derivatives

ChemistrySelect, 2023
Man Vir Singh
exaly  

Benzopyran Derivatives and an Aliphatic Compound from a Mangrove Endophytic Fungus Penicillium citrinum QJF‐22

Chemistry and Biodiversity, 2020
Runlin Cai, Zhigang She, Yan Chen
exaly  

Synthesis and pharmacological activity of 2-oxo-(2H) 1-benzopyran-3-carboxamide derivatives

European Journal of Medicinal Chemistry, 1993
Daniela Secci
exaly  

2,4,6-Trichloro-1,3,5-triazine as an Efficient Catalyst for Synthesis of Benzopyran Derivatives under Solvent-Free Conditions

Synthetic Communications, 2008
Zhan-Hui Zhang
exaly  

Benzopyran derivatives

1997
KOGA HIROSHI, SATO HARUHIKO, ISHIZAWA TAKENORI, NABATA HIROYUKI   +3 more
openaire   +4 more sources

Two new benzopyran derivatives from Gouania leptostachya DC. var. tonkinensis Pitard.

Chinese Chemical Letters, 2011
Chong Yao
exaly