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54277-08-6

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54277-08-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 54277-08-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,2,7 and 7 respectively; the second part has 2 digits, 0 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 54277-08:
(7*5)+(6*4)+(5*2)+(4*7)+(3*7)+(2*0)+(1*8)=126
126 % 10 = 6
So 54277-08-6 is a valid CAS Registry Number.

54277-08-6Relevant articles and documents

Highly Stereoselective approach to Alk-2-yne-1,4-diols by oxazaborolidine-mediated reduction of Alk-2-yne-1,4-diones

Ariza, Xavier,Bach, Jordi,Berenguer, Ramon,Farras, Jaume,Fontes, Montserrat,Garcia, Jordi,Lopez, Marta,Ortiz, Jordi

, p. 5307 - 5313 (2007/10/03)

We performed the borane-mediated reduction of a series of symmetrical alk-2-yne-1,4-diones (5) in the presence of the oxazaborolidine (R)-6 to afford (R,R)-alk-2-yne-1,4-diols ((R,R)-1) in good yields and high stereoselectivities (up to 99.9% ee). In some cases, the stereochemical purity of 1 was improved by a two-step process: (i) temporary transformation of 1 into its vic-dibromo derivatives 9, which allowed us to remove the minor meso isomer by chromatography, and (ii) regeneration of the enantioenriched diols 1 with SmI2. Reduction of the hexacarbonyldicobalt complexes 8 derived from 5 was also successful.

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