کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5226744 | 1383584 | 2009 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Push-pull structures with a pyrazine core and hexatriene chain: synthesis and light-emitting properties Push-pull structures with a pyrazine core and hexatriene chain: synthesis and light-emitting properties](/preview/png/5226744.png)
In this paper, we describe the synthesis of various push-pull molecules with a central pyrazine unit connected to a hexatriene chain terminated by various p-substituted phenyl groups. The key steps involve metallation and subsequent transmetallation of 2-chloro and 2,6-dichloropyrazine followed by a Negishi cross-coupling reaction of the intermediate organozinc derivative with (2E,4E)-5-bromopentadienal. The aldehydes are then submitted to a Wittig reaction with the appropriate phosphonium salts readily obtained from various substituted benzyl alcohols. The light-emitting properties of the so obtained molecules are then investigated in terms of absorption and emission spectra and non-linear optics experiments have been carried out in two cases.
Journal: Tetrahedron - Volume 65, Issue 21, 23 May 2009, Pages 4190-4200