3,6-DI-2-PYRIDYL-1,2,4,5-TETRAZINE Chemical Properties

Melting point:

225 °C (dec.) (lit.)

Boiling point:

509.1±48.0 °C(Predicted)

Density 

1.317±0.06 g/cm3(Predicted)

storage temp. 

Inert atmosphere,Room Temperature

form 

powder to crystal

pka

-1.77±0.11(Predicted)

color 

Red to Dark red to Brown

Water Solubility 

Slightly soluble in water.

InChI

InChI=1S/C12H8N6/c1-3-7-13-9(5-1)11-15-17-12(18-16-11)10-6-2-4-8-14-10/h1-8H

InChIKey

JFBIRMIEJBPDTQ-UHFFFAOYSA-N

SMILES

N1C(C2=NC=CC=C2)=NN=C(C2=NC=CC=C2)N=1

CAS DataBase Reference

1671-87-0

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36

WGK Germany 

3

HS Code 

29339900

MSDS

• Language:English Provider:SigmaAldrich

3,6-DI-2-PYRIDYL-1,2,4,5-TETRAZINE Usage And Synthesis

Uses

3,6-Di-2-pyridyl-1,2,4,5-tetrazine may be used in the preparation of mononuclear, cyclic tetranuclear, and 1-D helical-chain Cu(II) complexes, via metal-assisted hydrolysis. It also may be used in the synthesis of novel cyclic tetranuclear ZnII complex and synthesis of substituted 3,6-di(2-pyridyl)pyridazines, via inverse electron demand Diels Alder reaction with alkenes or alkynes.

General Description

3,6-Di-2-pyridyl-1,2,4,5-tetrazine undergoes solid-state reaction with fullerene C₆₀ by high-speed vibration milling technique. It acts as electron-deficient diene in the inverse electron demand Diels Alder reaction.

Synthesis

The general procedure for the synthesis of 3,6-di-2-pyridyl-1,2,4,5-tetrazine from the compound (CAS: 19081-87-9) was as follows: 8.0 g (0.077 mol) of 2-cyanopyridine was dissolved in 200 mL of anhydrous ethanol and transferred to a three-neck flask. Subsequently, 9.54 mL (0.308 mol) of 95% hydrazine hydrate was added to the solution. The mixture was refluxed for 6 h. Upon completion of the reaction, 7.54 g (81.7% yield) of orange dianhydride-based product was obtained. The solid was collected by filtration, washed several times with ethanol and then dissolved in glacial acetic acid. Under cooling conditions in an ice bath, 5-6 mL of concentrated nitric acid was added slowly and dropwise. After the reaction was completed, the mixture was poured onto crushed ice and adjusted to alkaline with sodium bicarbonate, followed by two extractions with chloroform. The organic layers were combined, dried over anhydrous sodium sulfate and concentrated under reduced pressure to give 6.3 g (85% yield) of 3,6-bis(2'-pyridinyl)-1,2,4,5-tetrazine as a purple solid. 6.3 g (0.027 mol) of the resulting 3,6-bis(2'-pyridyl)-1,2,4,5-tetrazine was dissolved in dimethylformamide (DMF) and transferred to a three-neck flask. Acetylene gas was passed into the solution and refluxed. During the reaction, the color of the mixture gradually changed from purple to transparent. After completion of the reaction, DMF was evaporated under reduced pressure and the residue was extracted with ethyl acetate. The resulting solid was purified by silica gel column chromatography with the eluent ethyl acetate:hexane (1:4, v/v).

References

[1] Patent: WO2007/7943, 2007, A1. Location in patent: Page/Page column 8

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