To provide a novel fluorinated dioxolan compound which can be used as a raw material for a fluorinated polymer excellent in characteristics such as heat resistance, mechanical strength, transparency and rigidity, and a novel polymer. A compound represented by the following formula (1A), a compound represented by the following formula (1B) and a polymer comprising repeating units, wherein these compounds are polymerized. Here, Q
f1
represents a single bond, an oxygen atom, a C
1-5
perfluoroalkylene group, or a C
1-5
perfluoroalkylene group having an etheric oxygen atom inserted between carbon-carbon atoms, X
2
is a fluorine atom, or a group represented by —OR (wherein R is a hydrogen atom, a C
1-5
is alkyl group, or a C
1-5
alkyl group having an etheric oxygen atom inserted between carbon-carbon atoms).
提供一种新型含
氟二
氧戊环化合物,该化合物可用作具有优异耐热性、机械强度、透明性和刚性等特性的含
氟聚合物的原料,以及一种新型聚合物。一种由下式(1A)表示的化合物、一种由下式(1B)表示的化合物和一种由重复单元组成的聚合物,其中这些化合物被聚合。这里,Q
f1
代表单键、氧原子、C
1-5
全氟烯基或 C
1-5
在碳-碳原子之间插入一个醚氧原子的 C 1-5
全氟烯烃基,X
2
是
氟原子,或由 -OR 表示的基团(其中 R 是氢原子、C
1-5
烷基,或 C
1-5
烷基,该烷基在碳-碳原子之间有一个醚氧原子)。