for safrole and MeNO
2 a freezer is not really req, just follow msds info on storage for nitromethane and for safrole just keep it sealed (air and moisture proof) in a dark cool place.
Ketone: look at
https://www.thevespiary.org/rhodium/Rhodium/chemistry/brightstar.mdma.html
The ketone is unstable. It won't explode or anything, but if left to its own devises, it will rearrange. And then it will be useless. At room temp, it will rearrange in about a week - depending on where you live - if you keep it in the freezer - it can last months - FREEZER!
Answer your q?