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1254344-23-4

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1254344-23-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1254344-23-4 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,5,4,3,4 and 4 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 1254344-23:
(9*1)+(8*2)+(7*5)+(6*4)+(5*3)+(4*4)+(3*4)+(2*2)+(1*3)=134
134 % 10 = 4
So 1254344-23-4 is a valid CAS Registry Number.

1254344-23-4Relevant articles and documents

An efficient and convenient synthesis of 4,5,6,7-tetrahydrothieno[3,2-c] pyridines by a modified Pictet-Spengler reaction via a formyliminium ion intermediate

Kitabatake, Michikazu,Hashimoto, Aki,Saitoh, Toshiaki,Sano, Takehiro,Mohri, Kunihiko,Horiguchi, Yoshie

, p. 1903 - 1921 (2011/04/12)

A synthesis of N-formyl-4,5,6,7-tetrahydrothieno[3,2-c]pyridines (5) was achieved in a highly efficient manner via trifluoroacetic acid catalyzed cyclization of formyliminium ion (4), which was produced by imination of 2-(2-thienyl)ethylamine (1) and a carbonyl compound (2) using titanium(IV) tetraisopropoxide followed by formylation with acetic-formic anhydride in a one-pot procedure. This modified Pictet-Spengler reaction provides a convenient method for preparing 4,5,6,7-tetahydrothieno[3,2-c]pyridines (6) possessing various substituents at C-4. The Japan Institute of Heterocyclic Chemistry.

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