Cas 128628-23-9,3-Diphenylamino-cyclobut-3-ene-1,2-dione

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Check Digit Verification of cas no

The CAS Registry Mumber 128628-23-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,6,2 and 8 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 128628-23:
(8*1)+(7*2)+(6*8)+(5*6)+(4*2)+(3*8)+(2*2)+(1*3)=139
139 % 10 = 9
So 128628-23-9 is a valid CAS Registry Number.

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128628-23-9Relevant articles and documents

Oxokohlenstoffe und verwandte Verbindungen; 14. Mitteilung. Chemie der Semiquadratsaeure: Reaktive Semiquadratsaeure-Abkoemmlinge und deren Umsetzung mit N-Nucleophilen

Schmidt, Arthur H.,Debo, Michael,Wehner, Bernhard

, p. 237 - 242 (2007/10/02)

Starting from semisquaric acid (1), the semisquaric esters 6a-d and semisquaric chloride (7) were prepared.Reaction of 6c or 7 with amines as well as the method of mixed anhydrides, starting from 1, afforded the semisquaric amides 10a-n (Methods A, B, C,

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128628-23-9