Try Potassium Tert-Butoxide (KOt-Bu) as base it will deprotonate the alcohol and facilitate the reaction

• Use solvents like DMSO or DMF for effective nucleophilic substitution

Deprotonation followed by nucleophilic substitution will form the ether via SN2 mechanism

• To be in detail, add strong base to alcohol in dry conditions this deprotonates the secondary alcohol to form the corresponding alkoxide which acts as nucleophile
• Once the alkoxide is formed, add ethyl iodide to RM and stir at RT results in ether formation
• After ether formation neutralize the RM with HCl. I mean PH adjustment with HCl and extract(separation) ether our product using any organic solvent

NOTE:

1. Be ensure that the chosen conditions do not lead to hydrolysis of that functional group, use a non-aqueous and anhydrous environment

2. To avoid side reactions be cautious while maintaining reaction conditions as ethyl iodide is a good electrophile due to the good leaving group iodine

Hope this helps you Keval Bambharoliya

1 equiv. of NaH in dry DMF at 0 °C. Then add your iodide and stir at rt.

Good luck!

Dissolve your Sec-Ol with dry xylene, add sodium metal (small pieces) into

that refluxed at 100 °C, and add ethyl iodide continue heating for 3 hr at same temperature.