8-oxaspiro[bicyclo[5.1.0]octane-2,2'-[1,3]dioxolane]

1-(三甲基硅氧基)环戊烯

6-溴-1,4-二噁螺[4.6]十一烷

7-oxo-1,4-dioxa-spiro[4.6]undecane-8-carboxylic acid ethyl ester

(三溴甲基)苯汞