1. What Is 4-Ethenylphenol Ace t ate? 4-Ethenylphenol Acetate , also known as 4-Acetoxystyrene or 4-Vinylphenyl Acetate , is an aromatic organic compound used as a building block in polymer chemistry and functional material research. Its CAS Registry Number is 2628-16-2 . The molecule contains a vinyl group attached to an aromatic ring and an acetate-protected phenolic oxygen. This combination makes 4-Ethenylphenol Acetate relevant to researchers developing functional polymers, specialty resins, and materials requiring controlled chemical modification. Unlike compounds containing a free phenolic hydroxyl group, 4-Ethenylphenol Acetate has its phenolic oxygen protected by an acetate group. This structural feature can provide additional flexibility in synthetic route design. For chemical manufacturers, material developers, and R&D teams, understanding its molecular structure, polymerization behavior, and potential applications is essential when evaluating this monomer for a sp...