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128733-25-5

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128733-25-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128733-25-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,7,3 and 3 respectively; the second part has 2 digits, 2 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 128733-25:
(8*1)+(7*2)+(6*8)+(5*7)+(4*3)+(3*3)+(2*2)+(1*5)=135
135 % 10 = 5
So 128733-25-5 is a valid CAS Registry Number.

128733-25-5Downstream Products

128733-25-5Relevant articles and documents

Lipase-catalyzed alcoholysis of diol dibenzoates: Selective enzymatic access to the 2-benzoyl ester of 1,2-propanediol and preparation of the enantiomerically pure (R)-1-O-benzoyl-2-methylpropane-1,3-diol

Santaniello, Enzo,Casati, Silvana,Ciuffreda, Pierangela,Gamberoni, Luca

, p. 1705 - 1708 (2005)

Enzymatic debenzoylation of 1,2-propanediol dibenzoate with 1-octanol has been studied in organic solvent using lipases from different sources. In general a slow, highly regioselective alcoholysis in diisopropyl ether affords exclusively a monoester benzoylated at the secondary hydroxy group although the reaction proceeds with low enantioselectivity. In the presence of Pseudomonas cepacia lipase absorbed onto celite, a faster reaction allows the preparation of the 2-benzoyl ester of (R)-1,2-propanediol (82% ee) and the enantiomerically pure (R)-1-O-benzoyl-2-methylpropane-1,3-diol (>98% ee).

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