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128999-98-4

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128999-98-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128999-98-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,9,9 and 9 respectively; the second part has 2 digits, 9 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 128999-98:
(8*1)+(7*2)+(6*8)+(5*9)+(4*9)+(3*9)+(2*9)+(1*8)=204
204 % 10 = 4
So 128999-98-4 is a valid CAS Registry Number.

128999-98-4Downstream Products

128999-98-4Relevant articles and documents

Experimental and Theoretical Study of the Reactivity of Primary and Secondary Enaminones toward Diphenylketene. A Comparison of AM1 and HAM/3 Semiempirical Methods

Eberlin, Marcos N.,Takahata, Yuji,Kascheres, Concetta

, p. 5150 - 5155 (2007/10/02)

Diazodiphenylethanone (1) reacts with acyclic enamino ketones 2 and enamino esters 3 to form products of electrophilic attack of diphenylketene at Cα (5) and nitrogen (6 and 7).The relative reactivity of the different enaminones was shown to be consistent with HOMO energies determined by the HAM/3 semiempirical method.However, this approach could not completely explain the reactivity of the cyclic enamino ketones 4, which, by HAM/3, show a high energy second HOMO corresponding to the nonbonded pair of electrons on oxygen.

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