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20443-04-3

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20443-04-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20443-04-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,4,4 and 3 respectively; the second part has 2 digits, 0 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 20443-04:
(7*2)+(6*0)+(5*4)+(4*4)+(3*3)+(2*0)+(1*4)=63
63 % 10 = 3
So 20443-04-3 is a valid CAS Registry Number.

20443-04-3Relevant articles and documents

Fast hydrazone reactants: Electronic and acid/base effects strongly influence rate at biological pH

Kool, Eric T.,Park, Do-Hyoung,Crisalli, Pete

, p. 17663 - 17666 (2013)

Kinetics studies with structurally varied aldehydes and ketones in aqueous buffer at pH 7.4 reveal that carbonyl compounds with neighboring acid/base groups form hydrazones at accelerated rates. Similarly, tests of a hydrazine with a neighboring carboxylic acid group show that it also reacts at an accelerated rate. Rate constants for the fastest carbonyl/hydrazine combinations are 2-20 M-1 s-1, which is faster than recent strain-promoted cycloaddition reactions.

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