Topic
Xanthene
About: Xanthene is a research topic. Over the lifetime, 2132 publications have been published within this topic receiving 34803 citations. The topic is also known as: Xanthene & dibenzo[a,e]pyran.
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Patent•
15 May 2018
TL;DR: In this paper, an acrylate derivative of spiro[fluorene-9,9'-xanthene]-3,6'-diphenol and a preparation method thereof in the technical field of organic compound preparation are presented.
Abstract: The invention discloses an acrylate derivative of spiro[fluorene-9,9'-xanthene]-3',6'-diphenol and a preparation method thereof in the technical field of organic compound preparation. A novel acrylatederivative monomer of spiro[9H-fluorene-9,9'-[9H]xanthene]-3',6'-diphenol which is not reported in documents is prepared, and a novel raw material monomer with excellent performance is provided for preparing novel high refraction materials; the preparation conditions are mild, rigor reaction conditions, such as high pressure, high temperature and the like are not needed, the yield is high, and substances with severe toxicity are not generated.
1 citations
TL;DR: The self-condensation of cyclohexanone in diethyl ether catalyzed by sodium amide has been found to provide a one-step route to pyran 3 as discussed by the authors.
Abstract: The self-condensation of cyclohexanone in diethyl ether catalyzed by sodium amide has been found to provide a one-step route to pyran 3. Evidence is presented that the Cornubert ketone formed by this reaction corresponds to ketol 2 which readily rearranges under dehydrating conditions to afford pyran 3. Structural elucidation of pyran 3 was achieved by a combination of degradative (3 → 5b), synthetic (8 → 5b), and spectral methods. Xanthene 7, a key dehydrogenation product of ketol 2, was converted by selective reduction to dihydropyran 5b. The five-step synthesis of dihydroxypyran 5b from 1-carbomethoxycyclopentanol (8) provided unequivocal evidence for the structure assigned pyran 3 and xanthene 7.
1 citations
TL;DR: In this article, a novel macrocycle containing fluorescein, C31H32O5, has a xanthene core and a benzyl unit that are planar.
Abstract: A novel macrocycle containing fluorescein, the highly fluorescent title compound, C31H32O5, has a xanthene core and a benzyl unit that are planar. The latter is rotated by 72.99 (3)° from the xanthene mean plane. The C11 alkyl tether and the xanthene group adopt a cage-like structure and the xanthene adopts a quinoid-type configuration. The compound crystallizes as a racemic mixture with one molecule of each isomer per unit cell. Even though the planes described by the xanthene and the benzene rings of different molecules are separated by 3.341 (4) and 3.73 (1) A, respectively, there is insufficient overlap between the aryl units to promote π-stacking.
1 citations
Patent•
18 Dec 1975
TL;DR: Aryllamines of formula (I): Z-NR1R2 (where Z is of formula and r 1-4 are aliphatic radicals, opt. the same; R 1,3,4 can be H, and/or R 4 can be alkoxy) are prepd. by reacting a prim. or sec. amine of formula H-NR 1R2 with a phenol of formula Z-OH, in the presence of a carboxylic acid as mentioned in this paper.
Abstract: Aryllamines of formula (I): Z-NR1R2 (where Z is of formula and r1-4 are aliphatic radicals, opt. the same; R1,3,4 can be H, and/or R4 can be alkoxy) are prepd. by reacting a prim. or sec. amine of formula H-NR1R2 with a phenol of formula Z-OH, in the presence of a carboxylic acid. Cpds. (I) are useful as inters. for plant protection agents, optical brighteners, partic. aminocoumarins and dyes of xanthene, pyronine, rhodamine, oxasine series, azo dyes and dephenylmethane and triphenylmethane dyes. Simple economic process giving good yields of pure prod. The process does not leave residual tars or form N,N'-disubstd. meta-phenylenediamines, does not corrosive conditions or reagents, forms few pollutants and avoids use of high pressure and temp.
1 citations