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172376-01-1

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172376-01-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 172376-01-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,2,3,7 and 6 respectively; the second part has 2 digits, 0 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 172376-01:
(8*1)+(7*7)+(6*2)+(5*3)+(4*7)+(3*6)+(2*0)+(1*1)=131
131 % 10 = 1
So 172376-01-1 is a valid CAS Registry Number.

172376-01-1Relevant articles and documents

New, short synthesis of arylnaphthofuranone lignans based on reactions of o-aroylbenzyllithiums with furan-2(5H)-one

Kobayashi, Kazuhiro,Tokimatsu, Junsuke,Maeda, Kouji,Morikawa, Osamu,Konishi, Hasatoshi

, p. 3013 - 3016 (2007/10/03)

A simple and general method to prepare 9-arylnaphthofuran-1(3H)-one derivatives has been developed.The reaction of o-aroylbenzyllithiums with furan-2(5H)-one gave the corresponding adducts 5-8 and 5'-7', which upon treatment with thionyl chloride in pyridine followed by dehydrogenation with Pd-C in refluxing p-cymene afforded the arylnaphthofuranone derivatives 13-16.The process proved to be applicable to the preparation of some 1-aryl type naphthofuranone lignans (collinusin, dehydrodimethylretrodendrin and justicidin B).

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