1-Nonyl-4-phenol is an organic compound consisting of an n-nonyl group attached to the 4-position of phenol. The related nonylphenols with branched nonyl groups are commercially important detergents. It is used with mixed-metals stabilizers for heat stabilization of plastic and is a starting material for producing phenol resins. It's insoluble in water, but soluble in organic compounds like benzene and heptane.[1]