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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TL;DR: In this paper, a chiral pyrano[2,3-b] benzopyrans were synthesized by reaction of 2-C-acetoxymethylglycals 1 and 2 with phenols under Lewis acid catalysis.
37 citations
TL;DR: In this paper, a one-step synthesis of 2,2-dimethylchromans and chromenes using Amberlyst 15 as a catalyst is described, and the synthesis is shown to work in a single step.
Abstract: A convenient one-step synthesis of 2,2-dimethylchromans and chromenes using Amberlyst 15 as a catalyst is described.
37 citations
02 Jan 2008
36 citations
TL;DR: A new photochromic fused benzopyran presenting a bridge between the pyran double bond and the benzenic ring prevents the formation of the undesirable long-lived colored TT isomer and after laser irradiation the colored solution fades following a fast monoexponential decay.
35 citations
TL;DR: In this paper, the intramolecular cycloaddition of o-quinomethanes generated in situ from o-hydroxybenzaldehydes and unsaturated alcohol in the presence of trimethyl orthoformate was investigated.
Abstract: Elemental iodine has been utilized as an efficient catalyst for the intramolecular[4 + 2]cycloaddition of o-quinomethanes generated in situ from o-hydroxybenzaldehydes and unsaturated alcohol in the presence of trimethyl orthoformate to afford the corresponding trans-annelated pyrano[3,2-c]benzopyrans in high yields with high diastereoselectivity
35 citations