1.4- Dibenzyl-1,4-dihydropyrazines, benzylic

The reactions of A -benzyl-A, A-diphenacylamine hydrobromide with benzylamine at 120-130° was also reported to give 1,4-dibenzyl-2,6-diphenyl-l, 4-dihydropyrazine... 

Pyrolysis of 1,2-dibenzyl-3,6-diphenyl-1,2-dihydropyrazine (3) gave a mixture of 2,5-diphenylpyrazine, 3-benzyl-2,5-diphenylpyrazine, 2,5-dibenzyl-3,6-diphenyl-pyrazine, and toluene (1535), and pyrolysis of l,2-dibenzyl-3,5-diphenyl-l,2-dihydropyrazine formed a mixture of 2,6-diphenylpyrazine and 2-benzyl-3,5-diphenylpyrazine (1535). l-Benzyl-2,3,5-triphenyl-l,2-dihydropyrazine refluxed with palladium on charcoal in benzene gave 2,3,5-triphenylpyrazine (1542) and the... 

---