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64520-24-7

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64520-24-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 64520-24-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,5,2 and 0 respectively; the second part has 2 digits, 2 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 64520-24:
(7*6)+(6*4)+(5*5)+(4*2)+(3*0)+(2*2)+(1*4)=107
107 % 10 = 7
So 64520-24-7 is a valid CAS Registry Number.

64520-24-7Relevant articles and documents

Enantioselective synthesis of (-)-dihydrocodeinone: A short formal synthesis of (-)-morphine

Parker, Kathlyn A.,Fokas, Demosthenes

, p. 449 - 455 (2007/10/03)

The radical cyclization approach to the morphine alkaloids has been applied in an asymmetric synthesis of (-)-dihydrocodeinone. A chiral cyclohexenol (R-32), from the CBS reduction of the enone, is the source of chirality. The first key step, tandem closure in which stereochemistry is controlled by geometric constraints, (-)-15b → (+)-16, was followed by an unprecedented reductive hydroamination, completing the synthesis of (-)-dihydroisocodeine ((-)-17) in 13 steps from commercially available materials.

Studies in the (+)-morphinan series. 7. Unusual crystallographic and tautomeric properties of (+)-4-hydroxy-7-oxo-3-methoxy-17-methyl-5,6-dehydromorphinan: An interlacing double helix

Minamikawa,Rice,Jacobson,et al.

, p. 1901 - 1905 (2007/10/02)

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