Results 161 to 170 of about 3,529 (194)

A New Efficient Synthesis of Spirocyclic Benzopyrans

Synthesis, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Gregoire Pave, Pierre Chalard, Marie‐Claude Viaud‐Massuard, Yves Troin, Gerald Guillaumet   +4 more
openaire   +1 more source

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
openaire   +2 more sources

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.
openaire   +1 more source

Antimicrobial Benzopyrans from the Receptacle of Sunflower

Bioscience, Biotechnology, and Biochemistry, 1996
The antimicrobial substances in sunflower (Helianthus annuus) were investigated. Two antifungal benzopyran derivatives, 6-acetyl-2,2-dimethyl-1,2-benzopyran (1) and 6-acetyl-7-hydroxy-2,2-dimethyl-1,2-benzopyran (2), were isolated from the ethanol extract of sunflower receptacles.
A, Satoh, H, Utamura, M, Ishizuka, N, Endo, M, Tsuji, H, Nishimura   +5 more
openaire   +2 more sources

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
openaire   +1 more source

ChemInform Abstract: NEW ROUTES TO BENZOPYRANS. II. 4H‐1‐BENZOPYRANS

Chemischer Informationsdienst, 1979
A. HERCOUET, M. LE CORRE
openaire   +1 more source

Benzopyrans

1977
Nicholas P. Plotnikoff, Harold E. Zaugg
openaire   +1 more source

Organocatalytic Synthesis of Benzopyrans

Synfacts, 2007
A. Córdova, H. Sundén, I. Ibrahem, G.-L. Zaho, L. Eriksson   +4 more
openaire   +1 more source

Benzopyrans. 17. Triethylamine-mediated transformation of 4-oxo-4H-[1]benzopyran-3-carboxaldehyde

The Journal of Organic Chemistry, 1984
Chandra Kanta Ghosh, Chandrakanta Bandyopadhyay, Nimai Tewari   +2 more
openaire   +1 more source

Oxidation of 2-1-Benzopyrans to 4-1-Benzopyran-4-ones

2003
A. C. Williams, N. Camp
openaire   +1 more source