... In this paper, we report on the synthesis, chemistry, and spectroscopy of some furazano[3,4-b] piperazines la-d, furoxano[3,4- blpiperazines 2b-d, and some related compounds. These ... Page 3. Furazano- and Furoxano[3,4-b]piperazines J. Org. Chem., Vol. 50, No. 25, 1985 5125 ...