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74937-42-1

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74937-42-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 74937-42-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,9,3 and 7 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 74937-42:
(7*7)+(6*4)+(5*9)+(4*3)+(3*7)+(2*4)+(1*2)=161
161 % 10 = 1
So 74937-42-1 is a valid CAS Registry Number.

74937-42-1Downstream Products

74937-42-1Relevant articles and documents

The amination of 3-bromo-2-ethoxy-1,5-naphthyridine. A reinvestigation.

Haak, H. J. W. van den,Plas, H. C. van der

, p. 83 - 86 (2007/10/02)

The reaction of 3-bromo-2-ethoxy-1,5-naphthyridine with KNH2/NH3 was reinvestigated.The procedure, described in the literature for the preparation of the title compound does not lead to this compound but to the isomeric 3-bromo-1-ethyl-1,5-naphthyridin-2(1H)-one.Reaction of this compound with KNH2/NH3 yields 3- and 4-amino-1-ethyl-1,5-naphthyridin-2(1H)-one, the latter being the main product.The title compound was prepared on reacting 2,3-dibromo-1,5-naphthyridine with sodium ethoxide.A mixture of 3- and 4-amino-2-ethoxy-1,5-naphthyridine was obtained on amination of 3-bromo-2-ethoxy-1,5-naphthyridine.In both cases the intermediacy of the respective 3,4-didehydro compounds was proposed.

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