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87931-16-6

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87931-16-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 87931-16-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,9,3 and 1 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 87931-16:
(7*8)+(6*7)+(5*9)+(4*3)+(3*1)+(2*1)+(1*6)=166
166 % 10 = 6
So 87931-16-6 is a valid CAS Registry Number.

87931-16-6Downstream Products

87931-16-6Relevant articles and documents

Degradation of O-Arylisoureas in Alkali: A Low-temperature Chapman-type Rearrangement

Suttle, Nicola A.,Williams, Andrew

, p. 1369 - 1372 (2007/10/02)

NN'-Di-isopropyl-O-arylisoureas are demonstrated to rearrange intramolecularly to the corresponding NN'-di-isopropyl-N'-arylurea in alkaline solution.The large negative Broensted-type βL value (-2.3) for the reaction measured against the pK of the corresponding phenol and a modest entropy of activation are consistent with a 1,3-aryl migration.The high efficiency of the migration compared with that of the Chapman rearrangement of O-aryl imidoethers is attributed to the greater internal nucleophilicity of the imino nitrogen, which in the present case bears a negative charge.

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