4-Hexen-3-One is used as a Michael receptor to participate in addition reactions, such as reacting with nucleophiles like diethyl malonate and nitromethane, forming carbon carbon bonds. It is often used as a Michael receiver to take part in Michael addition reactions. This includes reacting with nucleophiles like diethylmalonate and nitrogenmethane. The resultant carbon carbon bonds are the basis for fine chemicals, such as long-chain ketone and cyclic molecules. Its carbon-carbon double bond can also be converted to saturated ketone by catalytic hydrogenation, and the corresponding alcohol can be produced through borohydride reaction. Ketocarbonyl group can undergo nucleophilic reaction such as addition and condensation. It is widely used to prepare pharmaceutical intermediates and spices, as well as functional materials monomers. It is the key link between basic chemical raw material and high-value functional molecules.

The essence and fragrance industry has found 4-hexene-3-one to be an essential ingredient due to its pleasant and unique aroma profile. Gas chromatography-mass spectrometry technology (GC-MS), used for analysis and sensory evaluation, reveals that its aroma combines sweetness of fresh fruit with freshness of grass. It has a scent that is similar to ripe apples and bananas, with a slight hint of grass and leaves. It has a low aroma threshold (about 0.05 – 0.1 mg/g) and is stable and persistent in the system. It interacts synergistically with different spice components. It is used not only to mix fruit essences such as apple, banana and pear but is also used in baked food essences (such as biscuit and cake) to enhance a natural and layered aroma. In the daily chemical essence field, it’s widely used in products like shampoo, body lotion, shower gel and other care products, as well as in cologne, eau de toilette and other fragrance products. It is used as a middle or top note to give the product a natural and fresh flavor. This meets the demands of the modern consumer for “natural” everyday chemical products.

The 4-hexen-3 one is a useful pharmaceutical intermediate because of its active functional groups that can be modified. Through epoxidation or addition, carbon carbon double bonds are used to create heterocyclic structures, which can then be used as the structural basis for synthesising biologically active drugs. As an example, to develop nonsteroidal antiinflammatory drugs, the indole derivatives that have anti-inflammatory properties can be produced by condensation reactions with aromatic amines followed by cyclizations, oxidations and other steps. In the production of large quantities of existing drugs, the indole derivative can be used as an intermediate to simplify synthesis and reduce costs. It can be used to replace high-cost raw materials in certain antidepressants and improve production efficiency.

Pesticides have become more effective due to the biological activity of 4-hexen-3-one and its structural adaptability. The research has shown that unsaturated ketones fragments within its molecular structures have a destructive impact on the cell membranes of certain plant pathogens, such as powdery mildew or downy mildew. They also have contact killing properties against pests like aphids and spider mites. Scientists have created new insecticides and fungicides through structural derivatization, which involves adding halogens, heterocycles and other functional groups to double or carbonyl site. This enhances their biological activity and selectivity and reduces toxicity. The 4-hexene-3-one can also be used in pesticide formulations as a synergist, reducing the thickness of the epidermis of plants, improving the adhesion of active ingredients to plant surfaces and thereby reducing pesticide dosage.

Due to its carbonyl reactivity and double bond polymerization, 4-Hexen-3-One is a promising material for materials science research. The carbon-carbon double bond of 4-hexene-3-one can be copolymerized or coordinated with monomers like ethylene, propylene and styrene to produce copolymers with ketone-carbonyl side groups. These groups can act as reaction sites, and undergo cross-linking with polyamines and polyols. This results in a three-dimensional structure which improves mechanical properties, heat resistance and solvent resistance. This modified polymer is widely used for high-performance coatings, such as anti-corrosion and automotive topcoats. It can also be used as an environmentally friendly adhesive (such a water-based polyurethane glue), as well as in biomedical materials. After modification, copolymers with 4-Hexen-3-One structural units can be used to create drug carriers that have a sustained release.