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188439-79-4

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188439-79-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 188439-79-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,8,4,3 and 9 respectively; the second part has 2 digits, 7 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 188439-79:
(8*1)+(7*8)+(6*8)+(5*4)+(4*3)+(3*9)+(2*7)+(1*9)=194
194 % 10 = 4
So 188439-79-4 is a valid CAS Registry Number.

188439-79-4Downstream Products

188439-79-4Relevant articles and documents

Synthesis and X-ray structural determination of new aniline derivatives of 2,4,6,8-tetraazabicyclo[3.3.0]octanes; anomeric effect in N-C-N moiety and implications of solvent polarity on 1H-NMR patterns

Kakanejadifard, Ali,Farnia, S. Morteza F.

, p. 2551 - 2556 (1997)

The condensation of aniline with glyoxal and formaldehyde in stoichiometric ratio, leads to 2,4,6,8-tetraphenyl-2,4,6,8-tetraazabicyclo[3.3.0]octane (1f) with formic acid as catalyst. Nine substituted derivatives of 1f have been prepared in high yield by this synthetic method. X-ray analysis revealed the existence of an anomeric effect, n(N) → σ*(C-N) in N-C-N moieties manifested by reduction in N-pyramidality and short C-N bond lengths. Moreover, 1H-NMR studies showed the dependency of methylenic protons splitting pattern on solvent polarity.

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