3',5'-Dibenzyloxyacetophenone

This compound is typically isolated as a white to pale cream crystalline solid with a faint aromatic odor. Its molecular formula is C22H20O3, corresponding to a molecular weight of 332.39. The melting point generally falls within the range of 112–116 ℃, reflecting a well-ordered crystal lattice. The calculated density is approximately 1.18 g/cm³ under ambient conditions. It exhibits good solubility in common organic solvents including dichloromethane, chloroform, ethyl acetate, and tetrahydrofuran, while showing limited solubility in methanol and ethanol and negligible solubility in water and aliphatic hydrocarbons. The molecule contains a central acetophenone core with benzyloxy substituents at the 3' and 5' positions of the phenyl ring. The ether linkages are stable under neutral and mildly basic conditions but may be cleaved by strong acids or hydrogenolysis. Storage in a tightly sealed container protected from light and moisture at ambient temperature is generally sufficient, though desiccated conditions are recommended for prolonged storage. Contact with strong oxidizing agents and strong acids should be avoided.

3',5'-Dibenzyloxyacetophenone consists of an acetophenone unit symmetrically substituted at the meta positions with two benzyloxy groups. The acetyl group attached to the central aromatic ring provides a reactive carbonyl site amenable to condensation reactions. The benzyl ethers serve as protecting groups for the phenolic hydroxyls, shielding them from unwanted reactions while remaining cleavable under mild hydrogenolysis conditions. The symmetrical substitution pattern creates a molecule with defined spatial arrangement of its functional groups, enabling selective transformations at either the ketone or the ether sites. This combination of a masked phenol and an activated carbonyl makes the compound a valuable intermediate for constructing more complex aromatic architectures, particularly in natural product synthesis and medicinal chemistry.

The benzyloxy groups allow temporary protection of phenolic hydroxyls during synthetic sequences requiring harsh conditions. After desired transformations at the acetyl group or elsewhere, the benzyl ethers can be cleanly removed by catalytic hydrogenation without affecting other sensitive functionalities. This orthogonal protection is widely exploited in the synthesis of polyphenolic natural products and their analogs.

The acetophenone core is a common motif in bioactive molecules with anti-inflammatory, antimicrobial, and anticancer properties. Derivatization at the carbonyl via Claisen condensation, aldol reactions, or reductive amination enables access to diverse compound libraries. The benzyloxy groups enhance lipophilicity and can be replaced with other substituents after deprotection to fine-tune pharmacokinetic parameters.

The rigid aromatic structure and electron-donating benzyloxy substituents make this compound a candidate for constructing organic semiconductors and light-emitting materials. After incorporation into conjugated polymers via cross-coupling or condensation reactions, it can contribute to hole-transport or light-harvesting properties in organic photovoltaic devices and OLEDs.

The acetyl group undergoes base-catalyzed condensation with aromatic aldehydes to form chalcones, which are key intermediates in flavonoid synthesis. The benzyl protecting groups can be retained throughout chalcone formation and subsequent cyclization, then removed in the final step to yield the target flavonoids. This strategy has been employed to prepare libraries of natural product analogs for biological screening.

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