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102340-74-9

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102340-74-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 102340-74-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,2,3,4 and 0 respectively; the second part has 2 digits, 7 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 102340-74:
(8*1)+(7*0)+(6*2)+(5*3)+(4*4)+(3*0)+(2*7)+(1*4)=69
69 % 10 = 9
So 102340-74-9 is a valid CAS Registry Number.

102340-74-9Relevant articles and documents

Structure and stereochemistry of new sesquiterpene esters from Echinacea purpurea (L.) Moench

Bauer,Khan,Lotter,et al.

, p. 2355 - 2358 (1985)

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Remarkable Differences in the Reactivity of Echinadiol and Shiromodiol, Biologically Active Epimeric Germacrane Derivatives

Appendino, Giovanni,Tettamanzi, Paola,Gariboldi, Pierluigi

, p. 2139 - 2144 (2007/10/02)

Treatement of echinadiol with a variety of acids gave a 8,9-secoguaiane aldol resulting from the cyclofragmentation of the ten-membered ring.Under these conditions its C-8 epimer (shiromodiol) did not react or underwent esterification of the hydroxy group at C-8.Allylic oxidation of both epimers occurred with oxidation of the allylic methyl to the formyl level and retention of configuration of the endocyclic trans (Z) double bond.However, whereas the enal from shiromodiol was stable, that from echinadiol smoothly underwent Z-E isomerization.Low temperature NMRexperiments showed that echinadiol and shiromodiol exist in solution as a mixture of parallel and crossed rotamers, whose ratio is ca. 1:5 for shiromodiol and 4:1 for echinadiol.Anchimeric stabilization of an incipient positive charge at C-10 or C-14 by the C-8 β-hydroxy group of echinadiol might be responsible for the observed differences in reactivity.

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