2,2,3,6,6-pentamethylpiperidino(4,5,2',3')tetrahydropyrano(6',5'')spiro-2'',2'',3'',6'',6''-pentamethyl-Δ3''-dehydropiperidine-4,4''-oxide 在
sodium tungstate 、
双氧水 作用下,
以
甲醇 为溶剂,
反应 240.0h,
以66%的产率得到1-oxyl-2,2,3,6,6-pentamethylpiperidino(4,5,2',3')-tetrahydropyrano(6',5'')spiro-1''-oxyl-2'',2'',3'',6'',6''-pentamethyl-Δ
3''-dehydropiperidine-4,4''-oxide