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18731-61-8

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18731-61-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 18731-61-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,8,7,3 and 1 respectively; the second part has 2 digits, 6 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 18731-61:
(7*1)+(6*8)+(5*7)+(4*3)+(3*1)+(2*6)+(1*1)=118
118 % 10 = 8
So 18731-61-8 is a valid CAS Registry Number.

18731-61-8Relevant articles and documents

PHOTO FRIES REARRANGEMENTS OF 1-NAPHTHYL ESTERS IN THE SYNTHESIS OF 2-ACYLNAPHTHOQUINONES

Crouse, David J.,Hurlbut, Sheri L.,Wheeler, Desmond M.S.

, p. 374 - 378 (2007/10/02)

The photo Fries rearrangements of esters of 1-naphthol and 5-methoxy-1-naphthol to the corresponding 1-hydroxy-2-acylnaphthalenes have been carried out.The best yield (70percent) was obtained by irradiating 5-methoxy-1-naphthyl acetate in ethyl acetate.By contrast the yield from 1-naphthyl acetate under similar conditions was 40percent.Oxidation of 1-hydroxy-5-methoxy-2-naphthyl cyclohexyl ketone with thallium trinitrate gave the corresponding 1,4-quinone.These results provide a method for the regioselective synthesis of tricyclic analogues of adriamycinone.

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