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1026257-87-3

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1026257-87-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1026257-87-3 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,2,6,2,5 and 7 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 1026257-87:
(9*1)+(8*0)+(7*2)+(6*6)+(5*2)+(4*5)+(3*7)+(2*8)+(1*7)=133
133 % 10 = 3
So 1026257-87-3 is a valid CAS Registry Number.

1026257-87-3Relevant articles and documents

Hafnium-catalyzed direct amide formation at room temperature

Lundberg, Helena,Adolfsson, Hans

, p. 3271 - 3277 (2015)

Herein, the first example of a metal-catalyzed protocol for direct amidation of nonactivated carboxylic acids at ambient temperature (26 °C) is presented. The mild reaction conditions give rise to high yields of a range of amides in reaction times as short as 90 min, employing a commercial hafnium complex, [Hf(Cp)2Cl2], as catalyst. Amino acids are transformed into their corresponding amides without racemization, and the catalyst displays full selectivity for the amidation of carboxylic acids over esters. Electronic properties of the carboxylic acids were found to have a strong influence on the rate of the amidation reaction, and the need for a balanced amount of molecular sieves was observed to be highly important for optimal reaction outcome.

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