Topic
Benzopyran
About: Benzopyran is a research topic. Over the lifetime, 1889 publications have been published within this topic receiving 15235 citations.
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2 citations
TL;DR: An x-ray diffraction structural study was carried out for the photochromic spirpyran 1′,3′, 3′-trimethyl-5′-nitrospiro(indoline-2′,2′-[2H-1]-benzopyran) as mentioned in this paper.
Abstract: An x-ray diffraction structural study was carried out for the photochromic spirpyran 1′,3′,3′-trimethyl-5′-nitrospiro(indoline-2′,2′-[2H-1]-benzopyran). The Cspiro-O bond in the spiropyran is longer than the normal value but shorter than in the isomeric spiropyran with the nitro group in the benzopyran fragment, which is characterized by a higher quantum yield.
2 citations
TL;DR: Palladium catalysis is an efficient way to obtain trimethylsilyl substituted benzopyran derivatives as mentioned in this paper. But it is not suitable for the use of synthetic materials, such as polyethylene.
Abstract: Palladium catalysis is an efficient way to obtain trimethylsilyl substituted benzopyran derivatives. After screen- ing a series of reactions , we found optimized conditions.
2 citations
2 citations
01 Jan 2012
TL;DR: In this paper, the synthesis of 6-chloro-4-(furan-2-ylmethyleneamino)-2,2-dimethyl-2H-chromen-3-ol was achieved.
Abstract: The synthesis of 6-chloro-4-(furan-2-ylmethyleneamino)-2,2-dimethyl-2H-chromen-3-ol was achieved. These compounds were synthesized from different substituted phenols as starting material. The phenols acetylated in the first step and undergone Fries rearrangement in the second step to afford ortho hydroxyl acetophenone moiety 3a-e. These further treated with acetone in toluene in the presence of piperidine to afford benzopyaranone 4a-e. The compound 4a-e was further reduced by sodium borohydrate in methanol to obtain 4hydroxy benzopyran 5a-e. The compound 5a-e was refluxed under Dean Stack condition using p-toluene sulphonic acid to afford benzopyrans 6a-e. These compounds were converted to epoxide 7a-e by treating with sodium hyphochloride in the presence of phosphate buffer and DCM- water as solvent. In the next step the ring opening reaction is done by treating with ammonia and methanol at 50-60 o C to afford 8a-e. The amino alcohol functional group is treated with different substituted furfuraldehyde to afford the target compound 9a-j. All the target compounds 9a-j were characterized by IR, NMR and Mass spectral data and tested for in vivo antihypertensive activity.
2 citations