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142009-83-4

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142009-83-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 142009-83-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,2,0,0 and 9 respectively; the second part has 2 digits, 8 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 142009-83:
(8*1)+(7*4)+(6*2)+(5*0)+(4*0)+(3*9)+(2*8)+(1*3)=94
94 % 10 = 4
So 142009-83-4 is a valid CAS Registry Number.

142009-83-4Downstream Products

142009-83-4Relevant articles and documents

The synthesis of ascididemin

Moody, Christopher J.,Rees, Charles W.,Thomas, Robert

, p. 3589 - 3602 (2007/10/02)

A short synthsis of the pentacyclic marine alkaloid ascididemin 1 (four steps, 21% yield) from 1,10-phenanthroline 16 is described. The key step, photocyclisation of the quinoneimine 14 in sulphuric acid, is the first such aza stilbene photocyclisation of a quinoneimine. Intermediate 14 is prepared in a single, but low yielding, step from the quinone 4 in an aza Wadsworth-Emmons reaction, or in much better yield from the epoxide 17 by treatment with 2- iodoaniline and triethylaluminium, followed by oxidation with barium manganate.

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