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51665-54-4

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51665-54-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 51665-54-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,1,6,6 and 5 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 51665-54:
(7*5)+(6*1)+(5*6)+(4*6)+(3*5)+(2*5)+(1*4)=124
124 % 10 = 4
So 51665-54-4 is a valid CAS Registry Number.

51665-54-4Downstream Products

51665-54-4Relevant articles and documents

Convenient synthesis of 2,3,9,10-tetraoxygenated protoberberine alkaloids and their 13-methyl alkaloids

Hanaoka, Miyoji,Hirasawa, Taeko,Cho, Won Jea,Yasuda, Shingo

, p. 399 - 404 (2000)

New and convenient synthesis of 2,3,9,10-tetraoxygenated protoberberine alkaloids and their 13-methyl alkaloids through the same intermediates was developed. Acylation of the brominated benzylphenethylamine (13) with α- chloro-α-(methylthio)acetyl chloride, followed by cyclization with stannic chloride, furnished the key intermediates 4-methylthio-3- phenethylisoquinolin-3-ones (14), which were methylated to provide their methyl derivatives (17). Both isoquinolin-3-ones (14, 17) were easily transformed into protoberberine alkaloids (16) and their 13-methyl alkaloids (21) in good yield.

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