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158837-41-3

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158837-41-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 158837-41-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,8,8,3 and 7 respectively; the second part has 2 digits, 4 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 158837-41:
(8*1)+(7*5)+(6*8)+(5*8)+(4*3)+(3*7)+(2*4)+(1*1)=173
173 % 10 = 3
So 158837-41-3 is a valid CAS Registry Number.

158837-41-3Relevant articles and documents

Synthesis of unsymmetrical 2,3-diaryl- and 2,4-diarylthiophenes starting from 2,5-dichlorothiophene

Sone,Sato,Umetsu,Yoshino,Takahashi

, p. 2187 - 2194 (2007/10/02)

Unsymmetrically substituted 2,4-diaryl- and 2,3-diarylthiophenes were synthesized from 2,5-dichlorothiophene via 4-aryl-2-chlorothiophenes in two and four steps including Ni-mediated cross-coupling, respectively. Aluminum chloride-catalyzed reaction of 3-aryl-2-chlorothiophenes with some aromatic ethers unexpectedly led to the formation of the corresponding 2,4-isomers.

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