4,4'-Dibromobenzophenone #CAS3988-03-2

4,4'-Dibromobenzophenone #CAS3988-03-2

It is an organic synthetic building block that combines a biphenyl ketone framework with dual active aromatic halogens, and is highly stable and highly reactive. In terms of its structure, the carbonyl group at the center has a strong electron-withdrawing effect, significantly reducing the electron density of the two adjacent benzene rings. As a result, it is extremely difficult for this compound to undergo traditional electrophilic substitution reactions through conventional electron modification. However, under high temperature or strong base conditions, its carbonyl group can still undergo nucleophilic addition with hydrazines or amine compounds (such as transforming into hydrazone), or undergo McMurry coupling reaction to reduce the carbonyl group to a double bond framework. The core chemical activity of this compound lies in the two symmetricalally distributed aromatic bromine atoms at the para position. They are excellent sites for transition metal catalyzed coupling reactions, which can simultaneously or stepwise react with aryl borates, terminal alkenes or amines under the action of catalysts such as palladium or nickel, thereby efficiently constructing linear symmetrical, highly conjugated biphenyl or polyaryl liquid crystal frameworks. In addition, it has excellent physical and chemical stability against air, water, strong acids and mild oxidants. It does not hydrolyze or self-polymerize at room temperature. However, under extreme strong reducing agents (such as lithium aluminum hydride) or strong light exposure, the carbonyl group and carbon-bromine bonds can undergo partial reduction degradation or breakage.

Application Of 4,4'-Dibromobenzophenone

4,4'-Dibromobenzophenone is used in the synthesis of high molecular weight poly(p-phenylene) derivatives through palladium-catalyzed polycondensation reaction.

4,4′-Dibromobenzophenone is the main degradation product of bromopropylate in honey.

4,4'-Dibromodiphenylketone belongs to symmetrical diaryl ketones. Symmetrical diaryl ketones are an important class of organic synthetic intermediates and have extensive applications in fields such as medicine, pesticides, and polymer materials. For example, diphenylketone is a key intermediate for preparing the anti-dizziness drug Chemicalbook Diphenhydramine and Difenidol, and 4,4’-difluorodiphenylketone is a key intermediate for preparing the cerebrovascular drug Fluphenazine. Moreover, many natural products and drug active molecules contain the skeleton structure of symmetrical diaryl ketones.

In the field of photoelectric chemical engineering, due to its highly symmetrical molecular structure and bidirectional transition metal catalytic coupling activity, it is widely used on a large scale for the synthesis of high-end engineering plastics (such as specialty polyetheretherketone PEEK, polyaryletherketone PAEK, etc., which are high-temperature resistant functional polymers), and it is also a major component for constructing organic light-emitting diode (OLED) photoelectric materials, thermally activated delayed fluorescence (TADF) main materials, liquid crystal display (LCD) polymers, and nonlinear optical materials with a large conjugated core structure.

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