Xanthene

Structural formula
General
Surname	Xanthene
other names	9 H -xanthene Dibenzopyran 10 H -9-oxaanthracene
Molecular formula	C 13 H 10 O
Brief description	yellowish leaflets
External identifiers / databases
CAS number 92-83-1 EC number 202-194-4 ECHA InfoCard 100.001.996 PubChem 7107 Wikidata Q413791
properties
Molar mass	182.22 g mol −1
Physical state	firmly
Melting point	100 ° C
boiling point	310-312 ° C
solubility	almost insoluble in water, slightly soluble in ethanol soluble in diethyl ether , chloroform , acetic acid , benzene and ligroin
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 317 P: 280
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Xanthene ( Greek "xanthos" = yellow ) is a tricyclic ether and thus a heterocyclic compound . The xanthene dyes , for example the rhodamines , fluorescein and eosin B and eosin Y , have the basic structure of xanthene.

Properties, presentation and use

Xanthene crystallizes in yellowish leaflets that dissolve well in non-polar solvents such as benzene , diethyl ether and chloroform , poorly in ethanol and not in water. The synthesis of xanthene takes place from xanthone by catalytic hydrogenation or by distillation with zinc dust . In the course of the oxidation , the reverse of the synthesis results in xanthone. Xanthene is used in organic synthesis and as a fungicide . In Germany, Austria and Switzerland there is no approval as a plant protection product.

Individual evidence

1. ↑ ^{a b c d e f} Entry on Xanthene. In: Römpp Online . Georg Thieme Verlag, accessed on April 19, 2014.
2. ↑ ^{a b} Xanthenes data sheet from Sigma-Aldrich , accessed on November 3, 2016 ( PDF ).
3. ^ Directorate-General for Health and Food Safety of the European Commission: EU pesticide database ; Entry in the national registers of plant protection products in Switzerland , Austria and Germany ; accessed on March 12, 2016.