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187839-29-8

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187839-29-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 187839-29-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,7,8,3 and 9 respectively; the second part has 2 digits, 2 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 187839-29:
(8*1)+(7*8)+(6*7)+(5*8)+(4*3)+(3*9)+(2*2)+(1*9)=198
198 % 10 = 8
So 187839-29-8 is a valid CAS Registry Number.

187839-29-8Upstream product

187839-29-8Downstream Products

187839-29-8Relevant articles and documents

Iminium Carbonic Acid Derivative Salts. XI [1]. Synthesis of N,S-Containing Heterobicycles from N-Protected 2-Methylthio-1,3-thiazinium and 2-Methylthiothiazolium Salts. Part 3. Reaction of N-Protected 2-Methylthio-1,3-thiazinium and 2-Methylthiothiazolium Salts with 3-Amino-2-cyano-3-arylacrylonitriles

Hanefeld, Wolfgang,Naeeni, Mahmoud,Schlitzer, Martin

, p. 1903 - 1907 (1996)

N-Boc-protected 2-methylthio-1,3-thiazinium 1 and 2-methylthiothiazolium iodides 2,3 obtained from the corresponding 3,4,5,6-tetrahydro-2H-1,3-thiazine-2-thiones and thiazolidine-2-thiones by the action of methyl iodide were reacted with 3-amino-2-cyano-3-arylacrylonitriles forming the cyclic isothioureas 5-7. The protection group was removed with trifluoroacetic acid whereupon the desired cyclisation to 3,4-dihydro-2H,6H-pyrimido[2,1-b][1,3]thiazines 8a-c, 8a′-c′ and thiazolo[3,2-b]pyrimidines 9a,b, 9a′,b′, 10a,b took place.

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