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638163-61-8

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638163-61-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 638163-61-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,3,8,1,6 and 3 respectively; the second part has 2 digits, 6 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 638163-61:
(8*6)+(7*3)+(6*8)+(5*1)+(4*6)+(3*3)+(2*6)+(1*1)=168
168 % 10 = 8
So 638163-61-8 is a valid CAS Registry Number.

638163-61-8Relevant articles and documents

Bridging Fluorides and Hard/Soft Mismatch in d6 and d 8 Complexes: The Case of [TI(μ-F)3Ru(PPh 3)3]

Becker, Claus,Kieltsch, Iris,Broggini, Diego,Mezzetti, Antonio

, p. 8417 - 8429 (2003)

[RuCl2(PPh3)3] reacts with thallium(I) fluoride to give either [Tl(μ-F)3Ru(PPh3)3] (1) or [Tl(μ3-F)(μ2-Cl)2RU 2(μ2-Cl)-(μ2-F)(PPh3) 4] (2) depending on the excess of TIF used. Both 1 and 2 were fully characterized, including X-ray structure determinations. Complex 1 reacts with dihydrogen to form the known ruthenium hydride complex [Ru-(H) 2(H2)(PPh3)3] upon hydrogenolysis of the Ru-F bond. The reaction of 1 with activated alkyl bromides (R-Br) gives the corresponding alkyl fluorides and the trinuclear complex [Tl(μ 3-F)(μ2-F)(μ2-X)Ru2(μ 2-Br)(μ2-F)(PPh3)4] (X = Br, F) (3), whose structure closely resembles that of 2. However, 1 is not active as catalyst for the nucleophilic fluorination of R-Br in the presence of thallium fluoride. The effect of the bridging coordination mode of fluoride on the Ru-F bond is discussed in terms of the HSAB principle, which suggests a more general model for predicting the stability of d6 and d8 complexes containing hard ligands (such as fluoro, oxo, and amido).

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