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Pyrazinones dimerization

Scheme 18 Palladium-catalyzed homo-dimerization of 2(llf)-pyrazinones... Scheme 18 Palladium-catalyzed homo-dimerization of 2(llf)-pyrazinones...
Irradiation of 1 in the solid state with a high-pressure mercury lamp (400 W) at room temperature for 20 min gave the [4+4] anti dimer 2, mp 148-150 °C, in 100% yield based on recovered starting pyrazinone 1. [Pg.137]

Miscellaneous Reactions.- The syn-trans dimer (132) is obtained on irradiation of the pyrazinone (133) in the solid state. The structure, a (4+4)-dimer, was fully identified by X-ray crystallographic analysis. This report corrects an earlier account of the... [Pg.190]

A study of the photodimerization of the pyridones (245) in a micellar environment has been reported.The results show that there is an alignment of the molecules in the micelle. The pyrazinone derivative (246) is photochemically unreactive when it is irradiated in solution at room temperature. However when it is irradiated in the solid state at room temperature a [4 + 4]-dimer (247) is formed. [Pg.268]

See other pages where Pyrazinones dimerization is mentioned: [Pg.28]    [Pg.279]    [Pg.89]    [Pg.763]    [Pg.89]    [Pg.374]    [Pg.279]    [Pg.336]    [Pg.263]    [Pg.279]   
See also in sourсe #XX -- [ Pg.223 ]

See also in sourсe #XX -- [ Pg.223 ]



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