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21024-17-9

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21024-17-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21024-17-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,0,2 and 4 respectively; the second part has 2 digits, 1 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 21024-17:
(7*2)+(6*1)+(5*0)+(4*2)+(3*4)+(2*1)+(1*7)=49
49 % 10 = 9
So 21024-17-9 is a valid CAS Registry Number.

21024-17-9Upstream product

21024-17-9Downstream Products

21024-17-9Relevant articles and documents

CHIRAL ACETYLENES AS SYNTHETIC INTERMEDIATES. V. A REINVESTIGATION ON THE SYNTHESIS OF OPTICALLY ACTIVE ISOXAZOLES

Falorni, Massimo,Lardicci, Luciano,Giacomelli, Giampaolo

, p. 7 - 10 (2007/10/02)

The synthesis of 3- or 5-alkyl isoxazoles and pyrazoles has been achieved starting from alkyl-substituted acetylenic ketones: the influence of the structure of the carbonyl compound on the isomeric composition of the heterocyclic compound has been studied.Some optically active monoalkyl-substituted isoxazoles have also been prepared: in this context, an investigation on the stereochemistry of the cyclization process has been carried out.

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