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Bis(2,2-diphenyl-2-hydroxyethyl)dimethylammonium bromide, also known as DDA, is a quaternary ammonium compound with the chemical formula C34H38BrNO2. It is a white crystalline solid that is soluble in water and organic solvents. DDA is widely used as a phase transfer catalyst in organic synthesis, particularly in the preparation of various organic compounds, such as esters, amides, and nitriles. It is also employed as a surfactant, corrosion inhibitor, and biocide in various industrial applications. Due to its cationic nature, DDA can interact with negatively charged surfaces, making it effective in applications such as water treatment and oil recovery. However, it is important to note that DDA can be toxic to aquatic life and should be handled with care to minimize environmental impact.

2118-04-9

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2118-04-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 2118-04-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,1,1 and 8 respectively; the second part has 2 digits, 0 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 2118-04:
(6*2)+(5*1)+(4*1)+(3*8)+(2*0)+(1*4)=49
49 % 10 = 9
So 2118-04-9 is a valid CAS Registry Number.

2118-04-9Downstream Products

2118-04-9Relevant academic research and scientific papers

Controlled formation of tetramethylammonium mono- and diylide

Cristau, Henri-Jean,Plenat, Francoise,Bayssade, Sylvie

, p. 29 - 33 (1999)

The reaction of tetramethylammonium bromide with n -butyllithium can selectively yield either trimethylammonium methylide or lithium dimethylammonium dimethylide, depending on the reaction conditions, as shown by 13C-NMR analysis of the deuterium-labelled species resulting from acidic trapping with DCl. So a simple synthesis of mono- or twice-functionalised methylammonium salts is allowed from a very usual starting material.

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