... Volume: Page: ... Good to high yields were obtained for all combinations of phenylazocarboxylic esters 1a–h with benzyl bromide (2a) (entries 1–8) irrespective of the ... entry, azo-carboxylate 1: R 1 =, allyl bromide 6: R 2 , R 3 , R 4 =, hydrazines 7:8 (%:%) a, α vs γ b. ...