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129757-52-4

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129757-52-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 129757-52-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,9,7,5 and 7 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 129757-52:
(8*1)+(7*2)+(6*9)+(5*7)+(4*5)+(3*7)+(2*5)+(1*2)=164
164 % 10 = 4
So 129757-52-4 is a valid CAS Registry Number.

129757-52-4Relevant articles and documents

Studies on the bisoxazoline- and (-)-sparteine-mediated enantioselective addition of organolithium reagents to imines

Denmark, Scott E.,Nakajima, Noriyuki,Stiff, Cory M.,Nicaise, Olivier J.-C.,Kranz, Michael

supporting information; experimental part, p. 1023 - 1045 (2009/05/30)

The enantioselective addition of organolithium reagents to N-anisylaldimines promoted by chiral bisoxazolines and (-)-sparteine as external ligands is described. This reaction proceeds readily with a wide range of aldimine substrates (aliphatic, aromatic, olefinic) and organolithium nucleophiles (Me, n-Bu, Ph, vinyl) in excellent yields (81-99%) and with high enantioselectivities (up to 97:3.0 er). The external ligands can be used in substoichiometric amounts albeit with slightly attenuated enantioselectivities. A systematic evaluation of the structural features of the bisoxazolines revealed a primary contribution from the substituent at C(4) and a secondary influence from the bridging substituents. A computational analysis (PM3) provided a clear rationalization for the origin of enantioselectivity.

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