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1242430-84-7

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1242430-84-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1242430-84-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,4,2,4,3 and 0 respectively; the second part has 2 digits, 8 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 1242430-84:
(9*1)+(8*2)+(7*4)+(6*2)+(5*4)+(4*3)+(3*0)+(2*8)+(1*4)=117
117 % 10 = 7
So 1242430-84-7 is a valid CAS Registry Number.

1242430-84-7Relevant articles and documents

Racemic and enantioselective total synthesis of heliespirones A & C

Huang, Chong,Zhang, Wenhan,Liu, Bo

, p. 43 - 55 (2011)

An account of the total synthesis of (±)-, (+)-heliespirone A and (±)-, (-)-heliespirone C is presented. In the first-generation total synthesis, we found rac-24a could be easily transformed to rac-heliespirones A & C in a biomimic way. Taking the disappointing diastereoselectivity of prenylation from 3 to 4, the nonselective dihydroxylation from 4 to 5 and the lenthy route in strategy A into account, we designed a different synthetic plan targeting a highly enantioselective, concise and protective-group free synthesis of heliespirones A & C. The palladium-catalyzed Michael addition and Sharpless AD played the key roles in the formation of optical lactone V, which could be easily transformed to compound I through two additional steps and the succedent operations were the same as those in the first-generation total synthesis. Our synthetic efforts indicated the bio-generation of heliespirones A & C from 24a should be a real process in nature.

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