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81697-89-4

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81697-89-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81697-89-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,6,9 and 7 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 81697-89:
(7*8)+(6*1)+(5*6)+(4*9)+(3*7)+(2*8)+(1*9)=174
174 % 10 = 4
So 81697-89-4 is a valid CAS Registry Number.

81697-89-4Downstream Products

81697-89-4Relevant articles and documents

PYRROLE CHEMISTRY. XXIV. THE VILSMEIER FORMYLATION AND CYANATION OF PYRROLE ACETALS. A SYNTHESIS OF PYRROLE-2,3,5-TRICARBOXALDEHYDE

Loader, Charles E.,Barnett, Graham H.,Anderson, Hugh J.

, p. 383 - 389 (2007/10/02)

The preparation of the acetals of a number of pyrrole mono- and dicarboxaldehydes is described.It is shown that, provided the reactivity of the unsubstituted ring positions on the pyrrole nucleus is not too low, a carboxaldehyde or a carbonitrile group may be substituted on the pyrrole ring using the Vilsmeier reaction or chlorosulfonyl isocyanate respectively. Vilsmeier formylation of the diacetal, 2,4-di(5,5-dimethyl-1,3-dioxan-2-yl)-pyrrole, followed by hydrolysis gave pyrrole-2,3,5-tricarboxaldehyde.

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