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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TL;DR: In this paper, a monoclinic C2/c (no. 15), a = 20.1788 (4) Å, b = 13.0247(4)Å, c = 18.0172(5)À, β = 119.874(2)°, V = 4106.1(2), Å3, Z = 4, Rgt(F) = 0.0363, wRref(F2)= 0.0981, T = 173(2)/ K.
Abstract: Abstract C51H56OP2, monoclinic, C2/c (no. 15), a = 20.1788(4) Å, b = 13.0247(4) Å, c = 18.0172(5) Å, β = 119.874(2)°, V = 4106.1(2) Å3, Z = 4, Rgt(F) = 0.0363, wRref(F2) = 0.0981, T = 173(2) K.
1 citations
01 Oct 2014
TL;DR: The workup procedure is green, involving only washing the reaction mixture with water to remove the ionic liquid, and reuse for at least seven successive runs without significant loss of catalytic activity.
Abstract: Bifunctional acidic ionic liquids, having both H-imidazolium and -SO3H groups as cation moieties (H-BFAILs) and CF3SO3- as anion, were synthesized in high yields. These H-BFAILs showed significant hydrophilic properties, lower acidity and higher thermal stability relative to common ionic liquids, due to their unique structures. The (propyl or butyl-3-sulfonic) imidazolium trifluoromethane sulfonates ([IMPS][TfO] and [IMBS][TfO]) were employed as efficient catalysts for the synthesis of 14-substituted-14H-dibenzo[a.j]xanthene derivatives via the condensation of β-naphthol with aromatic aldehydes at 80◦C under solvent-free conditions. The workup procedure is green, involving only washing the reaction mixture with water to remove the ionic liquid. The acidic ionic liquids were easily recovered and reused for at least seven successive runs without significant loss of catalytic activity.
1 citations
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20 Feb 2009
TL;DR: In this article, the xanthene derivative has n (representing an integer of 2-6) structural units represented by formula (1) (wherein, Rs represent each independently a 1-8C alkyl group, a 1 -8C alkoxy groups, a halogen atom, a hydroxy group or a 2-4C acyl group).
Abstract: PROBLEM TO BE SOLVED: To provide a new compound which is a compound other than xanthene and further improving heat stability of a thermoplastic polymer. SOLUTION: The xanthene derivative has n (representing an integer of 2-6) structural units represented by formula (1) (wherein, Rs represent each independently a 1-8C alkyl group, a 1-8C alkoxy group, a halogen atom, a hydroxy group or a 2-4C acyl group; i represents any integer of 0-3; j represents 0 or 1; and k represents any integer of 0-4). COPYRIGHT: (C)2010,JPO&INPIT
1 citations
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1 citations
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TL;DR: In this article, an efficient iron-catalyzed, microwave-promoted cascade benzylation−cyclization of phenols is reported, which can afford both 9-aryl and 9-alkyl xanthene derivatives in good to high yields using FeCl3 as the catalyst under MW irradiation conditions.
Abstract: An efficient iron-catalyzed, microwave-promoted cascade benzylation−cyclization of phenols is reported. Benzyl acetates, benzyl bromides, and benzyl carbonates are suitable benzylating reagents. The reactions proceed to afford both 9-aryl and 9-alkyl xanthene derivatives in good to high yields using FeCl3 as the catalyst under MW irradiation conditions.
1 citations