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51684-92-5

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51684-92-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 51684-92-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,1,6,8 and 4 respectively; the second part has 2 digits, 9 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 51684-92:
(7*5)+(6*1)+(5*6)+(4*8)+(3*4)+(2*9)+(1*2)=135
135 % 10 = 5
So 51684-92-5 is a valid CAS Registry Number.

51684-92-5Relevant articles and documents

2,2',5,5'-tetramethyl-4,4'-bis(diphenylphoshino)-3,3'-bithiophene: A new, very efficient, easily accessible, chiral biheteroaromatic ligand for homogeneous stereoselective catalysis

Benincori, Tiziana,Cesarotti, Edoardo,Piccolo, Oreste,Sannicolo, Franco

, p. 2043 - 2047 (2007/10/03)

The four-step straightforward synthesis of enantiopure (+)- and (-)- 2,2',5,5'-tetramethyl-4,4'-bis(diphenylphoshino)-3,3'-bithiophene (tetraMe- BITIOP), anew C2-symmetry chelating ligand for transition metals, is described, starting from 2,5-dimethylthiophene. The complexes of this electron-rich diphosphine with Ru(II) and Rh(I) were used as catalysts in some homogeneous hydrogenation reactions of prostereogenic carbonyl functions of α- and β-ketoesters, of prostereogenic carbon-carbon double bonds of substituted acrylic acids, and of N-acetylenamino acids. The enantiomeric excesses were found to be excellent in all the experiments and comparable with the best results reported in the literature for the same reactions, carried out under similar experimental conditions, with the metal complexes of the most popular chiral diphosphine ligands as catalysts.

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