Di-tert-butyl ether
Di-tert-butyl ether is a tertiary ether, primarily of theoretical interest as the simplest member of the class of di-tertiary ethers. Di-tertiary ethers are notoriously challenging to prepare because conventional SN,2 and dehydration methods favor elimination; as late as 1941, the existence of the molecule remained in doubt.
A mediocre-yielding synthesis for di-tert-butyl ether alkylates silver carbonate with tert-butyl chloride.