Cas 56625-47-9,2,2,3,3-tetrafluoro-1,4-dioxan

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Check Digit Verification of cas no

The CAS Registry Mumber 56625-47-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,6,6,2 and 5 respectively; the second part has 2 digits, 4 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 56625-47:
(7*5)+(6*6)+(5*6)+(4*2)+(3*5)+(2*4)+(1*7)=139
139 % 10 = 9
So 56625-47-9 is a valid CAS Registry Number.

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56625-47-9Relevant articles and documents

CYCLISIERUNGEN UNTER BETEILIGUNG VON FLUORIDIONEN, 3. MITTEIL. TEILFLUORIERTE 1.3- UND 1.4-DIOXANE

Siegemund, Guenter,Schwertfeger, Werner

, p. 133 - 144 (1982)

Cyclization of 2-(2-chloroethoxy)-perfluorcarboxylic acid halides 3 with alkali metal fluoride gives 2.3-perfluoro-1.4-dioxanes 6 with yields up to 84 percent.This reaction is also used for the preparation of 4.5.6-perfluoro-1.3-dioxanes 12 starting from 3-chloromethoxyperfluorocarbonyl compounds 11. - The preparation of starting materials is described.

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56625-47-9