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172271-46-4

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172271-46-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 172271-46-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,2,2,7 and 1 respectively; the second part has 2 digits, 4 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 172271-46:
(8*1)+(7*7)+(6*2)+(5*2)+(4*7)+(3*1)+(2*4)+(1*6)=124
124 % 10 = 4
So 172271-46-4 is a valid CAS Registry Number.

172271-46-4Relevant articles and documents

A new synthesis of podophyllum lignans by Weitz' aminium salt-induced free radical cycloaddition reaction of a doubly unsaturated ester

Ara,Takeya,Tobinaga

, p. 1977 - 1984 (2007/10/03)

(±)-Isopodophyllotoxin (1e) and related lactones 12, 13, 14 were synthesized by a biomimetic procedure from the doubly unsaturated esters 11a and 11b by means of an oxidative free radical cycloaddition reaction utilizing a stable cation radical salt, Weitz' aminium salt, in one step. (±)-Isopicropodophyllin (1g), the trans-fused lactones, 12, 13, and 16, and the cis-fused lactone 17 were also synthesized from the esters 11c and 11d by the reaction with the same reagent.

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