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581807-68-3

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581807-68-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 581807-68-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,8,1,8,0 and 7 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 581807-68:
(8*5)+(7*8)+(6*1)+(5*8)+(4*0)+(3*7)+(2*6)+(1*8)=183
183 % 10 = 3
So 581807-68-3 is a valid CAS Registry Number.

581807-68-3Relevant articles and documents

Total synthesis of (R, R, R)-γ-tocopherol through cu-catalyzed asymmetric 1,2-addition

Wu, Zhongtao,Harutyunyan, Syuzanna R.,Minnaard, Adriaan J.

, p. 14250 - 14255 (2014)

Based on the asymmetric copper-catalyzed 1,2-addition of Grignard reagents to ketones, (R, R, R)-γ-tocopherol has been synthesized in 36% yield over 12 steps (longest linear sequence). The chiral center in the chroman ring was constructed with 73% ee by the 1,2-addition of a phytol-derived Grignard reagent to an a-bromo enone prepared from 2,3-dimethylquinone.

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