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53017-44-0

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53017-44-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 53017-44-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,3,0,1 and 7 respectively; the second part has 2 digits, 4 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 53017-44:
(7*5)+(6*3)+(5*0)+(4*1)+(3*7)+(2*4)+(1*4)=90
90 % 10 = 0
So 53017-44-0 is a valid CAS Registry Number.

53017-44-0Relevant articles and documents

Syntheses of Substituted L- and D-Tryptophans

Irie, Kunihiko,Ishida, Akihiko,Nakamura, Tohru,Oh-ishi, Tokuro

, p. 2126 - 2139 (2007/10/02)

Several 5-substituted nb-methoxycarbonyl-L- and -D-tryptophan derivatives were synthesized from proline by a new route involving electrochemical oxidation, as well as by the known procedures.Removal of the Nb-methoxycarbonyl group was accomplished by treatment with Me3SiI in refluxing chloroform, then alkaline hydrolysis of the methyl esters afforded 5-substituted L- and D-tryptophans with high optical purities.Keywords - L-tryptophan 5-substituted; D-tryptophan 5-substituted; anodic oxidation; N-methoxycarbonyl group deprotection; Fischer indole synthesis; iodotrimethylsilane

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