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183998-27-8

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183998-27-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 183998-27-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,3,9,9 and 8 respectively; the second part has 2 digits, 2 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 183998-27:
(8*1)+(7*8)+(6*3)+(5*9)+(4*9)+(3*8)+(2*2)+(1*7)=198
198 % 10 = 8
So 183998-27-8 is a valid CAS Registry Number.

183998-27-8Downstream Products

183998-27-8Relevant articles and documents

Reduction of electron-deficient pyrroles using group I and II metals in ammonia

Donohoe, Timothy J.,Guyo, Paul M.,Beddoes, Roy L.,Helliwell, Madeleine

, p. 667 - 676 (1998)

The preparation and Birch reduction of a series of electron-deficient pyrroles is described. This methodology allows the synthesis of a variety of C-2 substituted 3-pyrrolines in good to excellent yields. The role of various activating groups (amide, ester, carbamate and urea) has been examined with regard to both stability under the Birch conditions and ease of deprotection after reduction. In addition, we discovered that the 3-pyrroline skeleton can be oxidised at C-5 with chromium trioxide-3,5-dimethylpyrazole to form the 3-pyrrolin-2-one nucleus. The identity of the Birch reduced products and also of the oxidised 3-pyrrolin-2-ones has been confirmed by X-ray crystallography on two derivatives.

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