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55754-78-4

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55754-78-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 55754-78-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,5,7,5 and 4 respectively; the second part has 2 digits, 7 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 55754-78:
(7*5)+(6*5)+(5*7)+(4*5)+(3*4)+(2*7)+(1*8)=154
154 % 10 = 4
So 55754-78-4 is a valid CAS Registry Number.

55754-78-4Downstream Products

55754-78-4Relevant articles and documents

Unusual Tethering Effects in the Schmidt Reaction of Hydroxyalkyl Azides with Ketones: Cation-π and Steric Stabilization of a Pseudoaxial Phenyl Group

Katz, Christopher E.,Aube, Jeffrey

, p. 13948 - 13949 (2007/10/03)

The Lewis acid-promoted reactions of chiral 2-aryl-3-azido-1-propanols with 4-substituted cyclohexanones lead to iminium ethers and ultimately caprolactams (following a hydrolysis step). In this study, it is shown that these reactions afford variable ratios of products, depending on the electronic nature of the phenyl group. These results are interpreted in the context of a cation?π stabilizing effect in the product-determining reaction intermediate. Remarkably, the best selectivity was obtained when an azidopropanol reagent containing a quaternary center was used; a control experiment showed that the high selectivity observed in this result depended upon the free rotation of the pseudoaxial aromatic group in the intermediate that affords the major product. Copyright

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