Topic
Benzopyrans
About: Benzopyrans is a research topic. Over the lifetime, 694 publications have been published within this topic receiving 8830 citations.
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16 Nov 2018
TL;DR: The benzopyrans compound provided by the invention is simple in structure, easy to synthesize, low in production cost, and has a good inhibiting effect on the strawberry botrytis cinerea, potato altemaria solani, and watermelon fusarium oxysporum.
Abstract: The invention relates to the field of the agricultural fungicide, and specifically relates to a benzopyrans compound as well as a preparation method and application thereof. The benzopyrans compound provided by the invention is simple in structure, easy to synthesize, low in production cost, and has a good inhibiting effect on the strawberry botrytis cinerea, potato altemaria solani, and watermelon fusarium oxysporum.
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TL;DR: The absorption spectra in the visible region of the merocyanine forms of 1,3,3-trimethyl-6′nitrospiro [indoline-2,2′-[2H-1]benzopyrans] with different substituents in the 5 and 8′ positions were measured in this article.
Abstract: The absorption spectra in the visible region of the merocyanine forms of 1,3,3-trimethyl-6′nitrospiro [indoline-2,2′-[2H-1]benzopyrans] with different substituents in the 5 and 8′ positions were measured. The results are in agreement with concepts regarding the change in the contribution of the polar and nonpolar forms to the resulting merocyanine structure on introduction of substituents.
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30 Oct 1990
TL;DR: In this paper, the meanings of the benzopyrans of the formula "STR1" and "STR2" are described, a process for their preparation, and their use in pressure-sensitive or heat-sensitive layers.
Abstract: Benzopyrans of the formula ##STR1## where X is a radical ##STR2## and R1, R2, R3, R4 and the ring A have the meanings stated in the description, a process for their preparation, and their use in pressure-sensitive or heat-sensitive layers.
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TL;DR: The reaction of homophthaldehyde with 8-(benzylamino)menthol is regio-and diastereo-selective, leading to the chiral perhydro-1,3-benzoxazine 3 as a single diastereoisomer as discussed by the authors.
Abstract: The reaction of homophthaldehyde with (–)-8-(benzylamino)menthol is regio- and diastereo-selective, leading to the chiral perhydro-1,3-benzoxazine 3 as a single diastereoisomer. The addition of different organometallics to 3 yielded alcohols 4 in excellent yields. Hydrolysis of carbinols, with 2 % HCl in methanol or ethanol, allowed for the synthesis of 1,3-disubstituted isochromanes, but hydrolysis in toluene led to enantiopure 1-substituted isochromenes. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)