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500540-48-7

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500540-48-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 500540-48-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,0,0,5,4 and 0 respectively; the second part has 2 digits, 4 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 500540-48:
(8*5)+(7*0)+(6*0)+(5*5)+(4*4)+(3*0)+(2*4)+(1*8)=97
97 % 10 = 7
So 500540-48-7 is a valid CAS Registry Number.

500540-48-7Relevant articles and documents

Structure effect of TsDPEN derivatives on enantioselectivity of asymmetric transfer hydrogenation

Liu, Juntao,Wu, Yinuo,Li, Xingshu,Chan, Albert S.C.

, p. 2177 - 2180 (2008/09/21)

TsDPEN derivative (3,3′,5,5′-TMTsDPEN) was synthesized and applied in asymmetric transfer hydrogenation of ketones. The influence of chiral ligands' NCCN dihedral angles to the enantioselectivities of the reaction was discussed.

A convenient synthesis of bromopentaarylcyclopentadienes containing methyl or fluorine substituents

Thépot, Jean-Yves,Lapinte, Claude

, p. 179 - 188 (2007/10/03)

The ketones C5(3,5-C6H3Me2)4(O) (5b) and C5-2,5(3,5-C6H3Me2) 2(C6H5)2(O) (5c) were prepared and characterized. The pentaarylcyclopentadienols C5(C6H5)4(Ar′)(OH) (Ar′=3,5-C6H3Me2, 6a3; Ar′=2,4,6-C6H2Me3, 6a5; Ar′=3-C6H4F, 6a6; Ar′=3,5-C6H3F2, 6a7), C5(3,5-C6H3Me2) 4(Ar′)(OH) (Ar′=3-C5H4Me, 6b2; 3,5-C5H3Me2, 6b3; 3,6-C5H3Me2, 6b4; 2,4,6-C5H2Me3, 6b5; Ar′=3-C6H4F, 6a6; Ar′=3,5-C6H3F2, 6a7; Ar′=2,6-C6H3F2, 6a8) were obtained by reaction of the corresponding Ar′Li with the ketones C5(C6H5)4(O) (5a), or C5(3,5-C6H3Me2)4(O) (5b). The synthesis and characterization of the bromopentaarylcyclopentadienes C5(C6H5)4(Ar′)(Br) (Ar′=3,5-C6H3Me2, 7a3; Ar′=2,4,6-C6H2Me3, 7a5) and C5(3,5-C6H3Me2) 4(Ar′)(Br) (Ar′=3-C5H4Me, 7b2; 3,5-C5H3Me2, 7b3; 3,6-C5H3Me2, 7b4; 2,4,6-C5H2Me3, 7b5; Ar′=3-C6H4F, 7a6; Ar′=3,5-C6H3F2, 7a7; Ar′=2,6-C6H3F2, 7a8) containing methyl groups or fluorine atoms on the Ar′ rings are reported. The bromopentaarylcyclopentadienes are isolated as a 1:2:2 mixture of three isomers when Ar and Ar′ are different, except when the latter substituent bears two fluorine or two methyl groups in the ortho positions. In these cases the reaction is regiospecific and provides a unique isomer with the di-ortho-substituted arene located in the β-position with respect to the carbon bearing the bromine atom.

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