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87121-18-4

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87121-18-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 87121-18-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,1,2 and 1 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 87121-18:
(7*8)+(6*7)+(5*1)+(4*2)+(3*1)+(2*1)+(1*8)=124
124 % 10 = 4
So 87121-18-4 is a valid CAS Registry Number.

87121-18-4Relevant articles and documents

Halogenated Ketenes. 37. The Synthesis of Pyranones Utilizing the (4 + 2) Cycloaddition of Ketenes and Siloxy Dienes

Brady, William T.,Agho, Michael O.

, p. 501 - 506 (2007/10/02)

The reaction of diphenyl-, dichloro-, and chloroketenes with several siloxy dienes results in (4 + 2) and/or (2 + 2) cycloaddition products depending primarily on substitution in the diene.The (4 + 2) cycloaddition products are easily hydrolyzed to pyranones.These results are discussed in terms of a dipolar intermediate.

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