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437553-84-9

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437553-84-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 437553-84-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,3,7,5,5 and 3 respectively; the second part has 2 digits, 8 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 437553-84:
(8*4)+(7*3)+(6*7)+(5*5)+(4*5)+(3*3)+(2*8)+(1*4)=169
169 % 10 = 9
So 437553-84-9 is a valid CAS Registry Number.

437553-84-9Relevant articles and documents

Palladium-Catalyzed Cyclization Reactions of Acetylene-Containing Amino Acids

Wolf, Larissa B.,Tjen, Kim C. M. F.,Ten Brink, Hefziba T.,Blaauw, Richard H.,Hiemstra, Henk,Schoemaker, Hans E.,Rutjes, Floris P. J. T.

, p. 70 - 83 (2007/10/03)

Enantiomerically pure acetylene-containing α-amino acids were used as versatile starting materials for the synthesis of a variety of heterocycles via Pd-mediated cyclization reactions. Depending on the protecting group strategy, both the carboxylate and the amine function of the amino acids could participate in the cyclizations, thus giving rise to oxygen heterocycles (α-aminolactones) and nitrogen heterocycles (cyclic α-amino acid derivatives), respectively. Beside the straightforward cyclization, cyclization/cross-coupling reactions were also successfully carried out to provide the corresponding substituted cyclic amino acid derivatives.

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