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81781-51-3

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81781-51-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81781-51-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,7,8 and 1 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 81781-51:
(7*8)+(6*1)+(5*7)+(4*8)+(3*1)+(2*5)+(1*1)=143
143 % 10 = 3
So 81781-51-3 is a valid CAS Registry Number.

81781-51-3Upstream product

81781-51-3Relevant articles and documents

New Reagent Systems Containing CrO3 Provide Precursors for Syntheses of Neo-lignans

Takeya, Tetsuya,Matsumoto, Hiroshi,Kotani, Eiichi,Tobinaga, Seisho

, p. 4364 - 4367 (2007/10/02)

Oxidations of 1-aryl-1-propenes with new reagent systems, CrO3-HBF4-MeCN and CrO3-HClO4-MeCN, gave the 4-aryltetralones 1a and 1c, and the tetrahydrofuran 4, which are precursor molecules for aryltetrahydronaphthalene and tetrahydrofuran neo-lignans.Keywords - reagent system: chromium trioxide, neo-lignan; aryltetrahydronaphthalene; tetrahydrofuran

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