How are sulfides structurally related to ethers?

Sulfides (also known as thioethers) are structurally related to ethers because they are the sulfur analogs of these compounds.1

In an ether, an oxygen atom is bonded to two organic groups (R–O–R′), whereas in a sulfide, a sulfur atom is bonded to two organic groups (R–S–R′). Because sulfur and oxygen are both members of the chalcogen family, they exhibit structural similarities across various classes of compounds, including the relationship between ethers and sulfides.12

While they share this fundamental structural framework, there are significant differences in their properties due to the nature of the sulfur atom. Sulfur is a larger, more polarizable atom than oxygen, which influences the reactivity and physical characteristics of sulfides compared to their oxygen-containing counterparts.2