The transient existence of thieno[3,4‐b]quinoxaline (2d) as a product of dehydration of 1,3‐dihydrothieno[3,4‐b]quinoxaline 2‐oxide (5) was demonstrated by trapping experiments with N‐phenylmaleimide and dimethyl acetylenedicarboxylate. Attempts to isolate 2d from reaction mixtures arising from dehydration of 5 and from dehydrogenation of 1,3‐dihydro‐thieno[3,4‐b]quinoxaline (8) were unsuccessful.
Polyole (I) und (III)‐(VI) können im Zweiphasensystem Methylenchlorid/Nitriersäure unter relativ sicheren Bedingungen zu Polynitraten, z.B. (II), verestert werden.
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