21432-74-6 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21432-74-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,4,3 and 2 respectively; the second part has 2 digits, 7 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 21432-74:
(7*2)+(6*1)+(5*4)+(4*3)+(3*2)+(2*7)+(1*4)=76
76 % 10 = 6
So 21432-74-6 is a valid CAS Registry Number.
21432-74-6Relevant articles and documents
PROCESS FOR REGIOSELECTIVE DEMETHYLATION OF P-METHOXY GROUP IN PHENOLIC ESTER AND DIARYL KETONE MOIETIES
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Page/Page column 3, (2008/06/13)
Demethylation of 3′,4′-dimethoxy or 3′,4′,5′-trimethoxy benzoic ester of a phenol is carried out in the presence of an excess of aluminum halide in an organic solvent to get 4′-Hydroxy, 3′-methoxy or 4′ hydroxy, 3′,5′-dimethoxy benzoic acid ester of a phe