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138942-75-3

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138942-75-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 138942-75-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,9,4 and 2 respectively; the second part has 2 digits, 7 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 138942-75:
(8*1)+(7*3)+(6*8)+(5*9)+(4*4)+(3*2)+(2*7)+(1*5)=163
163 % 10 = 3
So 138942-75-3 is a valid CAS Registry Number.

138942-75-3Relevant articles and documents

Enzymatic reaction in supercritical fluid carbon dioxide using dry-ice

Yu, Hui-Ming

, p. 647 - 650 (1999)

New enzymatic reactions in supercritical fluid carbon dioxide catalyzed by lipases (PPL, Lipase MY, Candida cylindracea Lipase), and Proteases (subtilisin Carlsberg, subtilisin 8397, immobilized papain) with high efficiency and yields in a simple high pressure reactor using readily available dry-ice have been developed.

Modular P-OP ligands in rhodium-mediated asymmetric hydrogenation: A comparative catalysis study

Nunez-Rico, Jose L.,Etayo, Pablo,Fernandez-Perez, Hector,Vidal-Ferran, Anton

supporting information, p. 3025 - 3035 (2013/01/15)

Highly efficient and enantioselective hydrogenation reactions for α-(acylamino)acrylates, itaconic acid derivatives and analogues, α-substituted enol ester derivatives, and α-arylenamides (25 substrates) catalyzed by chiral cationic rhodium complexes of a set of P-OP ligands have been developed. The catalytic systems derived from these P-OP ligands provided a straightforward access to enantiomerically enriched α-amino acid, carboxylic acid, amine, and alcohol derivatives that are valuable chiral building blocks. Excellent efficiencies (full conversion in all cases) and extremely high enantiomeric excesses (94-99% ee) were achieved for a wide range of α-substituted enol ester derivatives, regardless of the substitution pattern. The R-oxy group of the ligand (methoxy or triphenylmethoxy) strongly influences the enantioselectivity and catalytic activity. Greater steric bulk around the metal centre correlated to greater (or similar) enantioselectivity, but also to slower hydrogenation. Furthermore, the hydrogenation rates observed with the four model substrates follow the same trend, independently of the R-oxy group of the ligand: methyl 2-acetamidoacrylate>dimethyl itaconate>1-phenylvinyl acetate>N-(1- phenylvinyl)acetamide. A substrate-to-catalyst ratio (S/C) of up to 10,000:1 was sufficient for total hydrogenation of a model substrate of intermediate reactivity (dimethyl itaconate), and did not imply any loss in conversion or enantioselectivity. Copyright

The total synthesis of pamamycin-607. Part 2: Synthesis of the C6-C18 domain

Fraser, Benjamin H.,Mulder, Roger J.,Perlmutter, Patrick

, p. 2857 - 2867 (2007/10/03)

Synthesis of the C6-C18 domain of pamamycin-607 was achieved in ten steps and 7% overall yield from commercially available d-norvaline. The key asymmetric transformations included a Paterson anti aldol addition, an anti selective reduction of the resultan

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