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408320-75-2

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408320-75-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 408320-75-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,0,8,3,2 and 0 respectively; the second part has 2 digits, 7 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 408320-75:
(8*4)+(7*0)+(6*8)+(5*3)+(4*2)+(3*0)+(2*7)+(1*5)=122
122 % 10 = 2
So 408320-75-2 is a valid CAS Registry Number.

408320-75-2Relevant articles and documents

Regiospecific Homologation of Unsymmetrical Ketones

Dave, Vinod,Warnhoff, E. W.

, p. 2590 - 2598 (1983)

A method has been developed for the regiospecific homologation of unhindered unsymmetrical ketones.The procedure consists of preparation of a pure α-halo ketone, reaction of this derivative with ethyl diazoacetate and boron trifluoride etherate, removal of the halogen by zinc reduction, and finally decarbethoxylation with water at 230 deg C or with CaCl2*2H2O in dimethyl sulfoxide at 150 deg C.The method depends on the electron-withdrawing power of the α-halogen to prevent the migration of the attached carbon.A-Homo steroid ketones are most conveniently prepared by this method.The reaction of α-acetoxy ketones with ethyl diazoacetate also leads mainly to migration of the unsubstituted α'-carbon atom.

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