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138944-21-5

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138944-21-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 138944-21-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,9,4 and 4 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 138944-21:
(8*1)+(7*3)+(6*8)+(5*9)+(4*4)+(3*4)+(2*2)+(1*1)=155
155 % 10 = 5
So 138944-21-5 is a valid CAS Registry Number.

138944-21-5Relevant articles and documents

A simple preparation of 1H-1,4-diazepine-7(6H)-thiones and their ring contraction to 1-vinyl-2,3-dihydro-1H-imidazole-2-thiones by thermal rearrangement reaction

Barluenga, J.,Carlon, R. Perez,Gonzalez, J.,Joglar, J.,Ortiz, F. Lopez,Fustero, S.

, p. 566 - 578 (2007/10/02)

An efficient synthesis of 1H-1,4-diazepine-7(6H)-thiones via a tandem -cycloaddition-ring expansion of chlorinated 2-aza-1,3-dienes with trimethylsilyl isothiocyanate is described.A thermal rearrangement of these 1,4-diazepine derivatives to 1-viny

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