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144318-26-3

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144318-26-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 144318-26-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,4,3,1 and 8 respectively; the second part has 2 digits, 2 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 144318-26:
(8*1)+(7*4)+(6*4)+(5*3)+(4*1)+(3*8)+(2*2)+(1*6)=113
113 % 10 = 3
So 144318-26-3 is a valid CAS Registry Number.

144318-26-3Relevant 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.

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