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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TL;DR: In this paper, the regiospecificity of the Michael and cyclisation reactions were discussed. But they were applied to activated monosubstituted 1,4-benzoquinones under mild conditions to give the corresponding Michael adducts.
Abstract: (+)-Euryfuran cycloadds regiospecifically to activated monosubstituted 1,4-benzoquinones under mild conditions to give the corresponding Michael adducts which, depending on the quinone substituent, undergo in situ redox reactions to the respective euryfurylbenzoquinones. One of the reported Michael adducts undergoes a facile stereoselective cyclisation under oxidant conditions to afford a naphthofuro[4,3- c ]benzopyran derivative. The regiospecificity of the Michael and cyclisation reactions are discussed.
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31 Jan 1995
TL;DR: In this paper, a method for safening herbicides in crop plants by using substituted benzopyran or tetrahydronaphthalene compounds of formula I was provided.
Abstract: There is provided a method for safening herbicides in crop plants by using substituted benzopyran or tetrahydronaphthalene compounds of formula I ##STR1## Further provided are compounds of formula II and compositions comprising a herbicide and an antidotally effective amount of a substituted benzopyran or tetrahydronaphthalene compound of formula I.
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27 Mar 1980
TL;DR: Tetrazolyl-chromones of formula (where R is 1-3C alkoxy), are new anti-allergic agents as mentioned in this paper and may be used in the management of conditions such as hay fever and asthma, generally at dosages of 0.012-0.100 kg/kg.
Abstract: Tetrazolyl-chromones of formula (where R is 1-3C alkoxy), are new. (I) are anti-allergic agents. (I) may be used in the management of conditions such as hay fever and asthma, generally at dosages of 0.012-0.100 kg./kg. orally or by aerosol admin.. In an example, 8-methoxycarbonitrile is refluxed with NaN3 in THF containing AlCl3 to give 8-methoxy-3-(1H-tetrazol-5-yl)-4H-1-benzopyran-4-one.