Oxygenated aminophenol compounds and methods for preventing monomer polymerization

A method for inhibiting the polymerization of monomers in a monomer-containing composition, the method comprising:

• adding a nitrogen- and oxygen-containing aromatic antipolymerant to a composition comprising a polymerizable monomer, wherein the polymerizable monomer is (a) selected from the group consisting of acrolein, acrylonitrile, alkylated styrene, chloroprene, divinylbenzene, ethyl acrylate, ethyl methacrylate, isoprene, methyl methacrylate, methyl acrylate, α-methylstyrene, methacrylonitrile, styrene, styrene sulfonic acid, vinyl acetate, vinyltoluene, and vinylpyridine, (b) selected from the group consisting of ethylene, acetylene, methylacetylene, vinylacetylene, propylene, butene, butyne, and butadiene;
• or (c) an unsaturated cyclic aliphatic compound, the nitrogen- and oxygen-containing aromatic antipolymerant being a compound of Formula I:
• wherein at least one of —R1, —R2, —R3, —R4, and —R5 is or are —OR8,
• wherein R8 is selected from the group consisting of —H, alkyl, aryl, alkyl-aryl, and aryl-alkyl having 3-18 carbon atoms, wherein any one or more of —R1, —R2, —R3, —R4, and —R5 that is not —OR8 is or are selected from the group consisting of hydrogen, alkyl, aryl, alkyl aryl and aryl alkyl, or any two adjacent groups of —R1, —R2, —R3, —R4, and —R5 that are not —OR8 form one or more ring structures;
• wherein R6 and R7 are, independently, carbon-containing groups, and at least one of R6 and R7 comprises one or more oxygen atom(s) separated from the N atom by one or more carbon atoms;
• wherein the compound of Formula I inhibits polymerization of the polymerizable monomer in the composition.