Results 181 to 190 of about 16,998 (233)

2-Benzopyran-3-one

Journal of the Chemical Society, Chemical Communications, 1983
Trapping and low temperature matrix isolation experiments show that 2-benzopyran-3-one (1) is efficiently generated by thermolysis or photolysis of the bis-lactone (2); flash vacuum thermolysis of (2) yields isocoumarin (5) and photolysis of (2) in an argon matrix gives (1) and the ketene (6).
David A. Bleasdale, David W. Jones, G�nther Maier, Hans Peter Reisenauer   +3 more
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Benzopyrans. Part 44. Synthesis of 3‐(4‐Oxo‐4H‐1‐benzopyran‐2‐yl)indolizines.

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Chandra Kanta Ghosh, Sumit Kumar Karak, Amarendra Patra   +2 more
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Convenient Preparation of Pyrano Benzopyranes in Aqueous Media

Synthetic Communications, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
M. Kidwai, S. Saxena
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ChemInform Abstract: Benzopyrans. Part 21. Reaction of 3‐Acyl‐4‐oxo‐4H‐(1)benzopyrans with Diazomethane: Synthesis of Heterocycles Fused with (1)Benzopyran.

ChemInform, 1987
AbstractThe reaction of the benzopyrans (Ia) and (Ib) with excess diazomethane (III) yields the products (II), (IVa), (IVb) and (Va).
C. K. GHOSH, A. BHATTACHARYYA, P. P. GHOSH‐DASTIDAR   +2 more
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Benzopyran sulfonamides as KV1.5 potassium channel blockers

Bioorganic & Medicinal Chemistry Letters, 2007
K(V)1.5 blockers have the potential to be atrium-selective agents for treatment of atrial fibrillation. The benzopyrans provide a template for the synthesis of potent and selective K(V)1.5 blockers.
John, Lloyd, Karnail S, Atwal, Heather J, Finlay, Michael, Nyman, Tram, Huynh, Rao, Bhandaru, Alexander, Kover, Joan, Schmidt, Wayne, Vaccaro, Mary Lee, Conder, Tonya, Jenkins-West, Paul, Levesque   +11 more
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QSAR studies on benzopyran potassium channel activators

European Journal of Medicinal Chemistry, 2006
QSAR studies on a series of benzopyrans as potassium channel activators have been carried out using a large set of distance-based topological indices. In addition, the molecular descriptors namely: negentropy and molecular redundancy indices have also been used.
V. K. Agrawal, J. Singh, M. Gupta, Y. A. Jaliwala, P. V. Khadikar, SUPURAN, CLAUDIU TRANDAFIR   +5 more
openaire   +3 more sources

Novel photochromism of differently-linked bis-benzopyrans

Organic & Biomolecular Chemistry, 2007
The unique photochromic bis-chromene 5 incorporates the structural attributes of both 3 and 4 . UV-vis irradiation of 5 leads to a dark brown colour, which is formed by mixing the purple and red colours observed for the photolysates of 3 and 4 , respectively.
Jarugu Narasimha, Moorthy, Parthasarathy, Venkatakrishnan, Subhas, Samanta   +2 more
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14.14 2H-1-Benzopyrans and 4H-1-Benzopyrans

Abstract2H-1-Benzopyrans and 4H-1-benzopyrans are a significant class of heterocyclic compounds that exist widely in plants, including edible vegetables and fruits, and possess a wide range of biological and pharmacological activities. Hence, these compounds have high potential in pharmaceutical discovery.
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Multidimensional Photochemistry Model: Application to Aminobenzonitrile and Benzopyran

19th International Conference on Ultrafast Phenomena, 2014
To understand the photoreactivity of aminobenzonitrile and benzopyran, their electronic structures and the potential energy landscapes were analyzed at the CASSCF level and models were developed to perform quantum dynamics ...
Perveaux, Aurélie, Gatti, Fabien, Meyer, Hans-Dieter, Lasorne, Benjamin, Lauvergnat, David, Castro, Pedro J., Reguero, M.   +6 more
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A generalised vibronic-coupling Hamiltonian model for benzopyran

The Journal of Chemical Physics, 2014
A new general model for describing intersecting multidimensional potential energy surfaces when motions of large amplitude are involved is presented. This model can be seen as an extension of the vibronic coupling models of Köppel et al. [“Multimode molecular dynamics beyond the Born-Oppenheimer approximation,” Adv. Chem. Phys. 57, 59 (1984)].
Joubert Doriol, Loic, Lasorne, Benjamin, Lauvergnat, David, Meyer, Hans-Dieter, Gatti, Fabien   +4 more
openaire   +2 more sources