Cas 1330640-65-7,C23H26O5

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Check Digit Verification of cas no

The CAS Registry Mumber 1330640-65-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,3,3,0,6,4 and 0 respectively; the second part has 2 digits, 6 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 1330640-65:
(9*1)+(8*3)+(7*3)+(6*0)+(5*6)+(4*4)+(3*0)+(2*6)+(1*5)=117
117 % 10 = 7
So 1330640-65-7 is a valid CAS Registry Number.

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1330640-65-7Relevant academic research and scientific papers

2,5-cis-2,3,5-Trisubstituted tetrahydrofurans from the diastereomixture of 2,4-disubstituted 1,3-dioxepins via stereomutation

Kubo, Ozora,Yahata, Kenzo,Maegawa, Tomohiro,Fujioka, Hiromichi

, p. 9197 - 9199 (2011/10/09)

A diastereoselective ring contraction of the diastereomixture of 2,4-disubstituted 1,3-dioxepins to 2,5-cis-2,3,5-trisubstituted tetrahydrofurans was achieved using TfOH in DMF. The reaction appears to proceed via a chair-like transition state, in which stereomutation of the oxocarbenium occurred, followed by an aldol-type cyclization.

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