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138922-13-1

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138922-13-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 138922-13-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,9,2 and 2 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 138922-13:
(8*1)+(7*3)+(6*8)+(5*9)+(4*2)+(3*2)+(2*1)+(1*3)=141
141 % 10 = 1
So 138922-13-1 is a valid CAS Registry Number.

138922-13-1Downstream Products

138922-13-1Relevant articles and documents

Highly selective synthesis of vitamin A and its derivatives. Critical comparison of some known palladium-catalyzed alkenyl-alkenyl coupling reactions

Negishi,Owczarczyk

, p. 6683 - 6686 (1991)

Vitamin A has been synthesized cleanly and selectively with essentially complete control of stereo- and regiochemistry in four linear and six overall steps from β-ionone and (E)-3-methyl-2-penten-4-yn-1-ol via Pd-catalyzed cross coupling of an alkenylzinc with an alkenyl iodide; the use of other metals, such as Al, Zr, Mg, B, Cu, and Sn, being inferior to that of Zn.

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