Introduction: Tetrabutylammonium bromide, also known as tetrabutylammonium bromide, is a white crystalline solid with deliquescent properties. It has a melting point of 118°C. It is readily soluble in water, alcohols, ethers, and acetone, and slightly soluble in benzene.

Applications: Tetrabutylammonium bromide is used as a phase transfer catalyst in organic chemistry for the synthesis of pharmaceutical intermediates such as benzyltriethylammonium chloride, ethyl cinnamate, and pseudoionone. It is also used in the synthesis of organic drugs such as the anti-infective drugs bamectin and sultamicillin. Furthermore, it is employed as a catalyst in the synthesis of salinomycin and other salinomycin-like drugs, including the novel antidiabetic drug dapagliflozin.

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