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1240403-82-0

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1240403-82-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1240403-82-0 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,4,0,4,0 and 3 respectively; the second part has 2 digits, 8 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 1240403-82:
(9*1)+(8*2)+(7*4)+(6*0)+(5*4)+(4*0)+(3*3)+(2*8)+(1*2)=100
100 % 10 = 0
So 1240403-82-0 is a valid CAS Registry Number.

1240403-82-0Downstream Products

1240403-82-0Relevant articles and documents

Stereoselective total synthesis of obolactones and 7′,8′-dihydroobolactones

Fernandes, Rodney A.,Kumar, Praveen,Saini, Deepak

, p. 18976 - 18982 (2021/10/29)

A concise stereoselective total synthesis of two diastereomeric obolactones and 7′,8′-dihydroobolactones has been achieved using a metal-free catalytic δ-hydroxyalkynone rearrangement, which could provide the required dihydro-γ-pyrone moiety. The desired first stereogenic center was installed through the chiral pool material,l-aspartic acid. Next, the allylation reaction was strategically utilized to provide the requisite olefin bond for the intended ring-closing metathesis, allowing the installation of the remaining dihydro-α-pyrone moiety in the natural products. It also enabled the targeting of both dihydro-α-pyrone diastereomers. Thus, the first stereoselective total synthesis of (+)-7′,8′-dihydroobolactone was accomplished, establishing its structure and absolute configuration.

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