Cas 263-30-9,Dibenzo[1,3,6,8]dioxadithiecin

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Check Digit Verification of cas no

The CAS Registry Mumber 263-30-9 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 2,6 and 3 respectively; the second part has 2 digits, 3 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 263-30:
(5*2)+(4*6)+(3*3)+(2*3)+(1*0)=49
49 % 10 = 9
So 263-30-9 is a valid CAS Registry Number.

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263-30-9Relevant articles and documents

A re-examination of the methylenation reaction

Cabiddu, Maria Grazia,Cadoni, Enzo,De Montis, Stefania,Fattuoni, Claudia,Melis, Stefana,Usai, Michele

, p. 4383 - 4387 (2003)

A re-examination of the methylenation reaction of 1-hydroxy-2-mercapto-, 1,2-dihydroxy- and 1,2-dimercapto-substituted benzenes by bromochloromethane with cesium carbonate shows that these substrates give mixtures of five- and ten-membered benzocondensed heterocyclic compounds and in some cases even dibenzodioxines.

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263-30-9