2Ethylhexyl

2-ethylhexyl is an eight-carbon branched alkyl substituent used in organic chemistry. It is derived from 2-ethylhexane and is commonly represented as the substituent name octan-2-yl; in many commercial contexts the name 2-ethylhexyl is preferred. The group is also known by synonyms such as iso-octyl or isooctyl, reflecting its relationship to the isooctyl family of branched octyl groups.

In terms of structure, the 2-ethylhexyl group attaches to other molecules through the primary carbon at one end, while a secondary carbon carries an ethyl substituent on the second carbon, giving a branched eight-carbon framework. This branching influences properties such as lipophilicity and volatility, which in turn affect the behavior of compounds bearing the group.

Uses and occurrence: 2-ethylhexyl is widely encountered as the alkyl tail in esters used across cosmetics, polymers, and solvents. Prominent examples include 2-ethylhexyl palmitate and 2-ethylhexyl acrylate, where the group contributes to texture, spreadability, and solvent characteristics. It also appears in various polymer additives and plasticizers; related compounds such as di-2-ethylhexyl phthalate have regulatory attention due to health and environmental concerns.

Safety and regulation: The hazard profile depends on the specific compound containing the 2-ethylhexyl group. While many esters are considered relatively stable and low-to-moderate hazard, some related phthalates and plastizers have regulatory restrictions in cosmetic and industrial contexts. Proper handling, labeling, and adherence to applicable safety regulations are advised for materials containing the 2-ethylhexyl group.

See also: iso-octyl, octan-2-yl, esters containing the 2-ethylhexyl group.