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21148-24-3

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21148-24-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21148-24-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,1,4 and 8 respectively; the second part has 2 digits, 2 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 21148-24:
(7*2)+(6*1)+(5*1)+(4*4)+(3*8)+(2*2)+(1*4)=73
73 % 10 = 3
So 21148-24-3 is a valid CAS Registry Number.

21148-24-3Relevant articles and documents

Using secondary alpha deuterium kinetic isotope effects to determine the stereochemistry of an E2 reaction; the stereochemistry of the E2 reaction of 1-chloro-2-phenylethane with potassium tert-butoxide in tert-butyl alcohol

Smith,Crowe,Westaway

, p. 1145 - 1152 (2001)

Isotopic labelling studies have shown that the E2 reaction of 1-chloro-2-phenylethane with potassium tert-butoxide in tert-butyl alcohol occurs via an anti-periplanar stereochemistry. This demonstrates that the different secondary alpha deuterium kinetic isotope effects found for the high and low base concentrations and in the presence of 18-crown-6 ether are because of changes in transition state structure that occur when the form of the reacting base changes rather than to a change in the stereochemistry of the reaction.

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