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470465-20-4

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470465-20-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 470465-20-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,7,0,4,6 and 5 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 470465-20:
(8*4)+(7*7)+(6*0)+(5*4)+(4*6)+(3*5)+(2*2)+(1*0)=144
144 % 10 = 4
So 470465-20-4 is a valid CAS Registry Number.

470465-20-4Relevant articles and documents

Synthesis of (-)-morphine

Taber, Douglass F.,Neubert, Timothy D.,Rheingold, Arnold L.

, p. 12416 - 12417 (2002)

The preparation of the diastereomerically pure β-tetralone ketal 4 is reported. Intramolecular alkylidene C-H insertion followed by hydrolysis of 4 proceeded to give the enantiomerically pure cyclopentene 15. The key step in this synthesis was the bis-intramolecular cyclization of keto aldehyde 2 to give the tetracyclic intermediate 20. Enone 20 was converted over several steps to (-)-morphine 1. Copyright

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