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21188-84-1

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21188-84-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21188-84-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,1,8 and 8 respectively; the second part has 2 digits, 8 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 21188-84:
(7*2)+(6*1)+(5*1)+(4*8)+(3*8)+(2*8)+(1*4)=101
101 % 10 = 1
So 21188-84-1 is a valid CAS Registry Number.

21188-84-1Relevant articles and documents

Isoquinolinium N-arylimides and some cycloadditions to heterocumulenes

Bast, Klaus,Behrens, Matthias,Durst, Toni,Grashey, Rudolf,Huisgen, Rolf,Schiffer, Reinhard,Temme, Robert

, p. 379 - 385 (1998)

The red isoquinolinium N-arylimides 19-23 are azomethine imines of which the C=N bond is part of an aromatic ring. The N-(4-nitrophenyl)imide 22 and the N-(2-pyridyl)imide 23 were obtained crystalline; in solution the latter equilibrates with the hexahydrotetrazine 24 as its dimer. The N-phenyl-imide 19 is not stable; an isolated solid appears to be a tetramer. Generated by deprotonation of 11-13, the N-arylimides 19-21 undergo in situ cycloadditions to carbon disulfide, phenyl isocyanate, phenyl isothiocyanate, and diphenylketene. The storable CS2 adduct 29 offers a neutral source of the N-phenylimide 19, since a cycloreversion equilibrium is established in solution.

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