939-95-7 Usage
General Description
3,4-Dichlorobenzenesulfonic acid is a chemical compound with the formula C6H4Cl2O3S. It is a white crystalline solid that is soluble in water and is used as an intermediate in the synthesis of pharmaceuticals and dyes. It is also used as a raw material for the production of other chemicals, such as herbicides and insecticides. 3,4-Dichlorobenzenesulfonic acid is a strong acid, and is commonly used in industrial processes as a catalyst and as a pH regulator. It is considered to be toxic if ingested or inhaled, and may cause skin and eye irritation, so proper safety precautions and protective equipment should be used when handling this substance.
Check Digit Verification of cas no
The CAS Registry Mumber 939-95-7 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 9,3 and 9 respectively; the second part has 2 digits, 9 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 939-95:
(5*9)+(4*3)+(3*9)+(2*9)+(1*5)=107
107 % 10 = 7
So 939-95-7 is a valid CAS Registry Number.
939-95-7Relevant articles and documents
Method for synthesizing felodipine intermediate 2,3-dichlorobenzaldehyde
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Paragraph 0030; 0032; 0033; 0039; 0040; 0047; 0048, (2019/10/01)
The invention discloses a method for synthesizing felodipine intermediate 2,3-dichlorobenzaldehyde. The method comprises the following steps: performing sulfonating, hydroformylation and de-sulfonation on o-dichlorobenzene to generate 2,3-dichlorobenzaldehyde; under the condition of a protonic acid, performing protonation and fracturing on urotropine to generate imine ions; using the imine ions toundergo electrophilic aromatic substitution on an aromatic ring and undergo tautomerism to generate a benzylamine derivative; performing secondary protonation and fracturing on the rest of urotropineto generate imine ions, and performing an intramolecular redox reaction to partially oxidize the benzylamine into benzylidene imine ions; and performing hydrolysis to obtain an aldehyde. The method has high selectivity, less pollution discharge and lower cost.
