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20635-15-8

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20635-15-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20635-15-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,6,3 and 5 respectively; the second part has 2 digits, 1 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 20635-15:
(7*2)+(6*0)+(5*6)+(4*3)+(3*5)+(2*1)+(1*5)=78
78 % 10 = 8
So 20635-15-8 is a valid CAS Registry Number.

20635-15-8Relevant articles and documents

Thioacylation Achieved by Activation of a Monothiocarboxylic Acid with Phosphorus Reagents

Hoeg-Jensen, Thomas,Olsen, Carl Erik,Holm, Arne

, p. 1257 - 1263 (1994)

A selection of phosphorus-based coupling reagents have been tested for their ability to activate the ambident nuceophilic monothio acid group as a thiocarbonyl functionality, suitable for use in thioacylations for the formation of thioamides.For these studies the reaction between thioacetic acid and cyclohexylamine to give the corresponding thioamide was chosen as a model.The obtained O/S-selectivities were monitored by the use of 31P NMR and were found to be dependent on the nature of the phosphorus functinality and on the kind of leaving group involved.Several new analogues of the widely used peptide coupling reagent (benzotriazol-1-yloxy)tris(pyrrolidino)phosphonium hexafluorophosphate (PyBOP, 1a) were prepared and investigated.Best results were obtained with two new analogues of PyBOP: tris(pyrrolidino)phosphonium hexafluorophosphate (PyNOP, 1b) and oxy>tris(pyrrolidino)phosphonium hexafluorophosphate (PyFOP, 1c).Both reagents, containing electron-withdrawing substituents at the benzotriazole ring, secured fast activation of the monothio acid.Other phosphorus reagents, such as bromotris(pyrrolidino)phosphonium hexafluorophosphate (PyBrOP, 1d), gave an undesired O/S-selectivity, leading to the formation of oxoamides and phosphorus sulfides.

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