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157731-15-2

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157731-15-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 157731-15-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,7,3 and 1 respectively; the second part has 2 digits, 1 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 157731-15:
(8*1)+(7*5)+(6*7)+(5*7)+(4*3)+(3*1)+(2*1)+(1*5)=142
142 % 10 = 2
So 157731-15-2 is a valid CAS Registry Number.

157731-15-2Downstream Products

157731-15-2Relevant articles and documents

Pteridin-4(3H)-ones and related compounds: Synthesis via intermolecular aza-Wittig reaction-heterocyclization and crystal structure

Okawa, Tomohiro,Kawase, Masaru,Eguchi, Shoji,Kakehi, Akikazu,Shiro, Motoo

, p. 2277 - 2285 (2007/10/03)

2,3-Disubstituted pteridin-4(3H)-one derivatives have been synthesized by the intermolecular aza-Wittig reaction-heterocyclization methodology. The structures of 3-allyl-2-anilinopteridin-4(3H)-one and 2-anilino-3-isopropylpteridin-4(3H)-one were determined by X-ray crystallographic analysis. Furthermore, imidazo[2,1-b]pteridine derivatives were synthesized by heterocyclization including iodoamination.

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