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20213-31-4

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20213-31-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20213-31-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,2,1 and 3 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 20213-31:
(7*2)+(6*0)+(5*2)+(4*1)+(3*3)+(2*3)+(1*1)=44
44 % 10 = 4
So 20213-31-4 is a valid CAS Registry Number.

20213-31-4Relevant articles and documents

Reaction between phenols and isoprene under zeolite catalysis. Highly selective synthesis of chromans and o-isopentenylphenols

Bigi, Franca,Carloni, Silvia,Maggi, Raimondo,Muchetti, Chiara,Rastelli, Massimo,Sartori, Giovanni

, p. 301 - 304 (1998)

Chromans 3 and o-isopentenylphenols 4 are synthesized in satisfactory to good yields and selectivities by the reaction of phenols and isoprene in the presence of the commercially available acid faujasite zeolite HSZ-360.

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