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82264-98-0

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82264-98-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 82264-98-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,2,6 and 4 respectively; the second part has 2 digits, 9 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 82264-98:
(7*8)+(6*2)+(5*2)+(4*6)+(3*4)+(2*9)+(1*8)=140
140 % 10 = 0
So 82264-98-0 is a valid CAS Registry Number.

82264-98-0Relevant articles and documents

Synthesis of pendant polyaminopolycarboxylic acid crown ethers: Potential ligands for MRI contrasting agents

Lakshmi,Devi, A. Prabhavathi,Nagarajan, Madhavarao

, p. 1495 - 1500 (2007/10/03)

The pendant polyamino crown ethers 8 and 11 and polyaminopolycarboxylic acid crown ethers 12 and 15, potentially useful as ligands for MRI contrasting agents as well as NMR shift reagents, have been synthesized from pentaerythritol.

Polytopic Cation Receptors. 2. Synthesis and Selective Complex Formation of Spiro-Linked "Multiloop Crown Compounds"

Weber, Edwin

, p. 3478 - 3486 (2007/10/02)

A new type of crown compound (1-10) featuring a spiro-linked assembly of two to four individual macrorings differing in ring size, rigidity, and donor characteristics is synthesized.Syntheses were achieved by means of high-dilution techniques and blocking/deblocking procedures beginning with pentaerythritol as the basic building block.The ability of the new ligands ("multiloop crown compounds") to selectively form crystalline polyhomonuclear/heteronuclear complexes is studied.It is found that the symmetrically looped molecules (1a-c, 4a, 6, 7d) can incorporate two orthree identical metal cations well matched in their diameter (Li+, Na+, K+, Ca2+, Ba2+).Cations which are too large to fit into the crown rings of 1a-c complex in a sandwich-like manner; those which are too small effect a high hydration in their complexes.Asymmetrical 1d and 9 allow the common uptake of different metal ions, e.g., a combination of Li+ and Ba2+ or of 2K+ and Co2+.The specific occupation of the different subrings is discussed.Ligand 1b is shown to discriminate Ca2+ from Na+; 1c and 6 preferentially complex Ba2+ from a Ba2+/K+ mixture.Thus, the new ligands act as manifold selective cation receptors, corresponding to the specification of their binding compartments.

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