# How to name this cyclic compound with an O in it?

How to name this cyclic compound with an O in it?

I was going to name it cyclobutane, but not all of the atoms making up the ring are carbons, one is an oxygen. So, then I decided to name it butane, but that doesn't make sense because there is a ring.

• This is $1,4$-epoxy butane. – Paras Khosla Dec 7 '19 at 19:37