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137638-43-8

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137638-43-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 137638-43-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,6,3 and 8 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 137638-43:
(8*1)+(7*3)+(6*7)+(5*6)+(4*3)+(3*8)+(2*4)+(1*3)=148
148 % 10 = 8
So 137638-43-8 is a valid CAS Registry Number.

137638-43-8Relevant articles and documents

Diametric stereocontrol in dynamic catalytic reduction of racemic acyl phosphonates: Divergence from α-Keto ester congeners

Corbett, Michael T.,Johnson, Jeffrey S.

, p. 594 - 597 (2013/03/13)

An unexpected dichotomy was observed in the Ru-catalyzed asymmetric transfer hydrogenation of acyl phosphonates: reduction proceeded from the opposite face relative to that observed in the analogous reduction of α-keto esters. The first highly selective catalytic hydrogenation of acyl phosphonates was utilized in the dynamic kinetic resolution of α-aryl acyl phosphonates, providing β-stereogenic α-hydroxy phosphonic acid derivatives.

A convenient and mild procedure for the preparation of α-keto phosphonates of 1-hydroxyphosphonates under solvent-free conditions using microwave

Kaboudin,Nazari

, p. 2245 - 2250 (2007/10/03)

The Reactions of 1-hydroxyphosphonates on the alumina-supported CrO3 are accelerated by microwave irradiation under solvent-free conditions to afford a high yielding synthesis of α-keto phosphonates.

ORGANIC PHOSPHORUS COMPOUNDS 97. SYNTHESIS AND PROPERTIES OF 1-AMINO-2-ARYL- AND 2-PYRIDYL-ETHYLPHOSPHONIC ACIDS AND DERIVATIVES

Maier, Ludwig,Diel, Peter J.

, p. 15 - 28 (2007/10/02)

1-Amino-2-(o, m, and p-pyridyl)-ethylphosphonic acids, 5α, 5β and 5γ, have been prepared by alkylation of benzylideneaminomethylphosphonate, followed by hydrogenation and hydrolysis, whereas 1-amino-2-(o, m, and p-methoxyphenyl)-ethylphosphonic acids, 5i,

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