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142274-14-4

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142274-14-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 142274-14-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,2,2,7 and 4 respectively; the second part has 2 digits, 1 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 142274-14:
(8*1)+(7*4)+(6*2)+(5*2)+(4*7)+(3*4)+(2*1)+(1*4)=104
104 % 10 = 4
So 142274-14-4 is a valid CAS Registry Number.

142274-14-4Relevant articles and documents

72. Synthesis of 2-Substituted and 2,3-Disubstituted Alkyl-and Aryl-thiophenes and Related 2,3-Anellated Thiophene Derivatives, Using Ketones and Carbonodithioic Acid O-Ethyl S-(2-Oxoethyl) Ester as the Building Blocks

Waldvogel, Erwin

, p. 907 - 912 (1992)

A simple method to synthesize 2-substituted and 2,3-disubstituted alkyl- and aryl-thiophenes as well as related 2,3-anellated thiophenes 6, starting from ketones 1 as C2-fragment and the S-protected carbonodithionic-acid derivative 3 as a C2S-fragment is described.The aldols 4 are intermediates of the two step process.

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