821-33-0 Usage
Originator
Dyskineacutebyl,Saunier
Manufacturing Process
To a solution of 3 mols butylmagnesiumbromide in ether was added dropwise an one mol of β-cyanoethyloxide. The mixture was refluxed for 1 hour. Then after cooling to the mixture was added hydrochloric acid. An organic layer was dried under sodium sulfate and evaporated. An oil layer was distilled in vacuum. The oxo-3-butane oxide has a boiling point 123-125°C at 15 mm.
A mixture of 100 g of oxo-3-butane oxide, 500 ml ethanol and 15 g Nickel Reney was loaded in autoclave and heated at 45-50°C. In autoclave was introduced a hydrogene. After cooling the mixture was filtered and ethanol was distilled off. 1,1'-Dimethyl-3,3'-oxydipropanol was distilled at 160161°C/18 mm.
Check Digit Verification of cas no
The CAS Registry Mumber 821-33-0 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 8,2 and 1 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 821-33:
(5*8)+(4*2)+(3*1)+(2*3)+(1*3)=60
60 % 10 = 0
So 821-33-0 is a valid CAS Registry Number.
821-33-0Relevant articles and documents
A high-purity and extremely butyl ether and its preparation method
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Paragraph 0034; 0035; 0037; 0039; 0041; 0043; 0045; 0047, (2017/09/13)
The invention discloses a new preparation method of high-purity dihydroxybutyl ether, and the new preparation method comprises the following steps: treating 1,3-butanediolby by using acidic cationic resin, performing reduced pressure distillation to obtain a dihydroxybutyl ethercrude product, treating the crude product by using petroleum ether and then performing vacuum rectification to prepare the high-purity dihydroxybutyl ether. The process route has the advantage of overcoming the corrosion caused by use of sulfuric acid to the equipment and has the characteristics of short reaction steps, gentle condition, simplicity in operation, high yield, high product purity and the like, so that the process route is an environment-friendly synthesis route easy for industrialization.
