How do you name hemiacetals?
There are two acceptable names for hemiacetals.
Consider the hemiacetal that is formed from butanal and ethanol:
You could name this as an alkoxy alcohol.
The name is then 1-ethoxybutan-1-ol.
Or you could name it using the class name "hemiacetal".
The name is then butanal ethyl hemiacetal.
Both names are acceptable.