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25443-71-4

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25443-71-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 25443-71-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,5,4,4 and 3 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 25443-71:
(7*2)+(6*5)+(5*4)+(4*4)+(3*3)+(2*7)+(1*1)=104
104 % 10 = 4
So 25443-71-4 is a valid CAS Registry Number.

25443-71-4Downstream Products

25443-71-4Relevant articles and documents

PREPARATION OF D-PENICILLAMINE. REACTION OF PENILLOIC ACID, PENICILLOIC ACID α-AMIDES AND BENZYLPENICILLIN WITH N,N'-DIPHENYLETHYLENEDIAMINE

Ogawa, Toshihisa,Tomisawa, Kazuyuki,Sota, Kaoru

, p. 2815 - 2824 (2007/10/02)

Reaction of benzylpenilloic acid (1) with N,N'-diphenylethylenediamine (2) in mixture of water, acetic acid and toluene under reflux yielded D-penicillamine (4).In a similar way, 4 was also obtained from benzyl- and phenoxymethylpenicilloic acid α-amides (6a-f) and benzylpenicillin potassium salt (13).The structures of the byproducts formed in these reactions were also determined.

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