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809289-72-3

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809289-72-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 809289-72-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,0,9,2,8 and 9 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 809289-72:
(8*8)+(7*0)+(6*9)+(5*2)+(4*8)+(3*9)+(2*7)+(1*2)=203
203 % 10 = 3
So 809289-72-3 is a valid CAS Registry Number.

809289-72-3Downstream Products

809289-72-3Relevant articles and documents

Preparation method of cyclen

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Paragraph 0052; 0053; 0054, (2020/02/14)

The invention provides a preparation method of cyclen. The method comprises the following step: taking triethylenetetramine (TETA) as a raw material to carry out refining, then carrying out a reactionon the refined triethylenetetramine with methylglyoxal to obtain an intermediate 2, carrying out cyclization on the intermediate 2 with glyoxal, carrying out reducing with sodium borohydride to obtain a cyclized intermediate 3, finally carrying out ring opening through acid hydrolysis, and then adjusting the pH value by using an alkali solution to free out the cyclen.

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