2,4-Dimethylpyrrole Struktur

2,4-Dimethyl-1H-pyrrol

Bezeichnung:2,4-Dimethyl-1H-pyrrol

CAS-Nr625-82-1

Englisch Name:2,4-Dimethylpyrrole

CBNumberCB2266022

SummenformelC6H9N

Molgewicht95.14

MOL-Datei625-82-1.mol

Synonyma

2,4-Dimethyl-1H-pyrrol

2,4-Dimethyl-1H-pyrrol physikalisch-chemischer Eigenschaften

Schmelzpunkt	6.5°C (estimate)
Siedepunkt	165-167 °C (lit.)
Dichte	0.924 g/mL at 25 °C (lit.)
Brechungsindex	n20/D 1.496(lit.)
Flammpunkt	>230 °F
storage temp.	Keep in dark place,Inert atmosphere,2-8°C
Löslichkeit	Chloroform (Slightly), Methanol (Slightly)
pka	18.03±0.50(Predicted)
Aggregatzustand	Crystalline Powder
Farbe	Orange-red to maroon, brown or violet
Stabilität	Light Sensitive
InChIKey	MFFMQGGZCLEMCI-UHFFFAOYSA-N
LogP	1.667 (est)
CAS Datenbank	625-82-1(CAS DataBase Reference)
NIST chemische Informationen	1H-Pyrrole, 2,4-dimethyl-(625-82-1)

Sicherheit

Kennzeichnung gefährlicher	Xi
R-Sätze:	36/37/38
S-Sätze:	26-36-37/39
WGK Germany	3
HS Code	29339900

Gefahreninformationscode (GHS)

2,4-Dimethylpyrrole Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
S37/39:Bei der Arbeit geeignete Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
Chemische Eigenschaften
clear light yellow to light yellow-orange liquid
Verwenden
2,4-Dimethylpyrrole may be used in the synthesis of the following:
- 2,5-bis(2′,4′-dimethyl-5′-pyrryl)p-benzoquinone
- boron dipyrromethene (BODIPY) dyes
- 2,4-dimethyl-6-methoxyprodigiosene
Verwenden
2,4-Dimethylpyrrole is a substituted pyrrole. Its synthesis by using ethyl acetoacetate as starting material has been reported. Its basicity has been evaluated from UV spectral data.Its photodecomposition on irradiation has been reported to afford H2, CH4, C2H6 and polymeric products.

2,4-Dimethylpyrrole may be used in the synthesis of the following:
2,5-bis(2′,4′-dimethyl-5′-pyrryl)p-benzoquinone.
boron dipyrromethene (BODIPY) dyes.
2,4-dimethyl-6-methoxyprodigiosene.
Synthesis Reference(s)
Synthesis, p. 1585, 2000 DOI: 10.1055/s-2000-7618
Allgemeine Beschreibung
2,4-Dimethylpyrrole is a substituted pyrrole. Its synthesis by using ethyl acetoacetate as starting material has been reported. Its basicity has been evaluated from UV spectral data. Its photodecomposition on irradiation has been reported to afford H₂, CH₄, C₂H₆ and polymeric products.
Synthese
420 g (2.0 mol) of 2,4-dimethyl-3,5-bismethoxycarbonylpyrrole were suspended in 1200 g of 20% strength sodium hydroxide solution, and the mixture was heated. The solid gradually passed into solution during this process. At 92° C. gas had started to evolve vigorously; some of the dicarboxylic acid was decarboxylated in the process. The methanol formed during the hydrolysis was distilled off continuously until essentially only water was passing over. The mixture which remained was then neutralized with 250 g of 50% strength sulfuric acid (pH about 7.5) and heated to boiling at the reflux condenser with water separator. The 2,4-dimethylpyrrole separated out as a yellow upper phase over the course of a few hours. The aqueous phase was continuously recycled into the boiling mixture. A total of 152.5 g of organic phase was obtained. This comprised 8.1% of water, the remainder consisted of 99.1% of 2,4-dimethylpyrrole, determined as area percentages by gas chromatography using a flame ionization detector. This corresponded to 138.9 g of 2,4-dimethylpyrrole (73% of theory).

2,4-Dimethylpyrrole Upstream-Materialien And Downstream Produkte

2,4-Dimethyl-1H-pyrrol Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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