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144303-42-4

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144303-42-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 144303-42-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,4,3,0 and 3 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 144303-42:
(8*1)+(7*4)+(6*4)+(5*3)+(4*0)+(3*3)+(2*4)+(1*2)=94
94 % 10 = 4
So 144303-42-4 is a valid CAS Registry Number.

144303-42-4Downstream Products

144303-42-4Relevant articles and documents

Molecular Sieve Controlled Diastereoselectivity: Effect in the Palladium-Catalyzed Cyclization of cis-1,2-Divinylcyclohexane with α-Oxygen-Substituted Acids as Chiral Nucleophiles

Tottie, Louise,Baeckstroem, Peter,Moberg, Christina,Tegenfeldt, Joergen,Heumann, Andreas

, p. 6579 - 6587 (1992)

Molecular sieves have been shown to improve greatly the stereoselectivity in the palladium(II)-catalyzed reaction of cis-1,2-divinylcyclohexane with chiral acids.Reactions run with molecular sieves and derivatives of (R)-lactic acids as nucleophiles always yielded products with S configuration at the newly formed chiral center in contrast to reactions without molecular sieves that gave products with either S or R configuration at this chiral center.It appears that this effect has not been observed previously.Only water-containing molecular sieves increased the stereoselectivity.A chiral palladium complex was formed faster in the presence of molecular sieves, but use of this complex as catalyst in the cyclization did not result in increased selectivity.The best stereoselectivity was found for molecular sieves with a high sodium content (Lancaster 13X and 4-Angstroem sieves).

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