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450406-20-9

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450406-20-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 450406-20-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,5,0,4,0 and 6 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 450406-20:
(8*4)+(7*5)+(6*0)+(5*4)+(4*0)+(3*6)+(2*2)+(1*0)=109
109 % 10 = 9
So 450406-20-9 is a valid CAS Registry Number.

450406-20-9Relevant articles and documents

Metalated nitriles: stereodivergent cation-controlled cyclizations

Fleming, Fraser F.,Wei, Yunjing,Liu, Wang,Zhang, Zhiyu

, p. 7477 - 7488 (2008)

Stereodivergent cyclizations of γ-hydroxy cyclohexanecarbonitriles are controlled simply through judicious choice of cation in the alkylmetal base. Deprotonating a series of cyclic γ-hydroxy nitriles with i-PrMgBr generates C-magnesiated nitriles that cyclize under stereoelectronic control to cis-fused hydrindanes, decalins, and bicyclo[5.4.0]undecanes. An analogous deprotonation with BuLi triggers cyclization to trans-fused hydrindanes, decalins, and bicyclo[5.4.0]undecanes consistent with a sterically controlled electrophilic attack on an equatorial nitrile anion. Using cations to control the geometry of metalated nitriles provides a versatile, stereodivergent cyclization to cis- and trans-hydrindanes, decalins, and [5.4.0]undecanes, and reveals the key geometric requirements for intramolecular SN2 and SN2′ displacements.

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