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108825-21-4

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108825-21-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 108825-21-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,8,8,2 and 5 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 108825-21:
(8*1)+(7*0)+(6*8)+(5*8)+(4*2)+(3*5)+(2*2)+(1*1)=124
124 % 10 = 4
So 108825-21-4 is a valid CAS Registry Number.

108825-21-4Relevant articles and documents

PS-IIDQ: a supported coupling reagent for efficient and general amide bond formation

Valeur, Eric,Bradley, Mark

, p. 8855 - 8871 (2007)

Polystyrene-IIDQ, a polymer-supported coupling reagent, was synthesized in three steps from Merrifield resin in 86% overall conversion. This reagent efficiently coupled carboxylic acids to amines in good yields and high purities, required no pre-activation step, and was tolerant of the order of reagent addition. PS-IIDQ was observed to be more efficient than polymer-supported carbodiimides (PS-EDC and PS-DCC) and gave higher yields than HATU for general amide bond formation, including the coupling of anilines and hindered substrates. When evaluated with five carboxylic acids and nine amines (including anilines and secondary amines) PS-IIDQ gave an average isolated yield of 73%.

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