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138213-57-7

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138213-57-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 138213-57-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,2,1 and 3 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 138213-57:
(8*1)+(7*3)+(6*8)+(5*2)+(4*1)+(3*3)+(2*5)+(1*7)=117
117 % 10 = 7
So 138213-57-7 is a valid CAS Registry Number.

138213-57-7Relevant academic research and scientific papers

Total synthesis of tetronolide, the aglycon of tetrocarcins

Takeda, Kei,Kawanishi, Eiji,Nakamura, Hitoshi,Yoshii, Eiichi

, p. 4925 - 4928 (2007/10/02)

The first total synthesis of tetronolide (1) has been achieved via coupling of spirotetronate 3 with octahydronaphthalene aldehyde 17 and subsequent macrocyclization of ω-sulfone-α-aldehyde 2, leading to confirmation of the absolute configuration of 1.

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