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70172-92-8

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70172-92-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 70172-92-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,0,1,7 and 2 respectively; the second part has 2 digits, 9 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 70172-92:
(7*7)+(6*0)+(5*1)+(4*7)+(3*2)+(2*9)+(1*2)=108
108 % 10 = 8
So 70172-92-8 is a valid CAS Registry Number.

70172-92-8Relevant articles and documents

Remarkably Selective Chlorination of Phthalic Anhydride and Its Monochlorinated Derivatives

Verbicky, John W.,Williams, Louella

, p. 2465 - 2468 (1983)

The vapor-phase chlorination of phthalic anhydride 1 and its monochlorinated derivatives 2 and 3 in the temperature range from 390 to 600 deg C with elemental chlorine has been investigated and found to be highly selective.Thus, chlorination of 1 in the temperature range from 390 to 450 deg C was found to give high yields of monochlorinated products accompanied by only small amounts of dichlorination with a high degree of regioselectivity favoring the formation of 4-chlorophthalic anhydride.Chlorination of a 3-chlorophthalic anhydride 3 by this method has provided thefirst direct synthesis of 3,5-dichlorophthalic anhydride 7 from phthalic anhydride via chlorination.

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