The best replacement for diol is glycol.

The best alternatives to diol are rated as following:
★★★★★  glycol
★★★★  dione

Your alternative for diol is not listed? Suggest!
Speaking about diol, one probably shouldn't forget about hio4.

Other search terms related to diol and their ratings are:
★★★★★ hio4
★★★★★ ketone
★★★★ pcc
You have in mind a companion for diol and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of diol in all years. Click on graph for more.
diol
glycol
dione