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135204-35-2

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135204-35-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 135204-35-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,5,2,0 and 4 respectively; the second part has 2 digits, 3 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 135204-35:
(8*1)+(7*3)+(6*5)+(5*2)+(4*0)+(3*4)+(2*3)+(1*5)=92
92 % 10 = 2
So 135204-35-2 is a valid CAS Registry Number.

135204-35-2Relevant articles and documents

Process for the stereochemical inversion of (2S,3S)-2-amino-3-phenyl-1,3-propanediols into their (2R,3R) enantiomers

-

, (2008/06/13)

A four step process for transforming (2S,3S)-2-amino-3-phenyl-1,3-propanediols into their (2R,3R)-enantiomers is described. The final compounds are useful intermediates for the synthesis of antibiotics like Chloramphenicol, Thiamphenicol and Florfenicol. The starting products generally are discard products in the synthesis of said antibiotics.

Direct Conversion of (1S,2S)-2-Amino-1--1,3-propanediol into Its Enantiomer for Efficient Synthesis of Thiamphenicol and Florfenicol

Giordano, Claudio,Cavicchioli, Silvia,Levi, Silvio,Villa, Marco

, p. 6114 - 6118 (2007/10/02)

The usual synthesis of thiamphenicol and florfenicol involves the resolution of racemic threo-2-amino-1--1,3-propanediol into its 1S,2S and 1R,2R isomers ((+)-3 and (-)-3), of which only the latter is a useful precursor.An efficient conversion of the 1S,2S isomer into the 1R,2R enantiomer in high yield, is described.

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