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22839-21-0

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22839-21-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 22839-21-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,2,8,3 and 9 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 22839-21:
(7*2)+(6*2)+(5*8)+(4*3)+(3*9)+(2*2)+(1*1)=110
110 % 10 = 0
So 22839-21-0 is a valid CAS Registry Number.

22839-21-0Relevant articles and documents

Oxidative couplings on tryptophan-based diketopiperazines leading to fused and bridged chemotypes

Mendive-Tapia, Lorena,Albornoz-Grados, Arantxa,Bertran, Alexandra,Albericio, Fernando,Lavilla, Rodolfo

supporting information, p. 2740 - 2743 (2017/03/10)

New chemotypes are obtained from tryptophan-containing diketopiperazines through selective C-C or C-N intramolecular oxidative couplings. The choice of the oxidant source dictates the outcome of the reaction.

Copper-catalyzed diastereoselective arylation of tryptophan derivatives: Total synthesis of (+)-naseseazines A and B

Kieffer, Madeleine E.,Chuang, Kangway V.,Reisman, Sarah E.

, p. 5557 - 5560 (2013/05/22)

A copper-catalyzed arylation of tryptophan derivatives is reported. The reaction proceeds with high site-and diastereoselectivity to provide aryl pyrroloindoline products in one step from simple starting materials. The utility of this transformation is highlighted in the five-step syntheses of the natural products (+)-naseseazine A and B.

Three types of induced tryptophan optical activity compared in model dipeptides: Theory and experiment

Hudecová, Jana,Horní?ek, Jan,Budě?ínsky, Milo?,?ebestík, Jaroslav,?afa?ík, Martin,Zhang, Ge,Keiderling, Timothy A.,Bou?, Petr

, p. 2748 - 2760 (2012/10/08)

The tryptophan (Trp) aromatic residue in chiral matrices often exhibits a large optical activity and thus provides valuable structural information. However, it can also obscure spectral contributions from other peptide parts. To better understand the indu

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