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98752-36-4

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98752-36-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 98752-36-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,8,7,5 and 2 respectively; the second part has 2 digits, 3 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 98752-36:
(7*9)+(6*8)+(5*7)+(4*5)+(3*2)+(2*3)+(1*6)=184
184 % 10 = 4
So 98752-36-4 is a valid CAS Registry Number.

98752-36-4Upstream product

98752-36-4Relevant articles and documents

A Study of Gaseous Benzenium and Toluenium Ions generated from 1,4-Dihydro- and 1-Methyl-1,4-dihydro-benzoic Acids

Kuck, Dietmar,Schneider, Jens,Gruetzmacher, Hans-Friedrich

, p. 689 - 696 (2007/10/02)

Gaseous benzenium C6H7(1+) (1) and toluenium C7H9(1+) (2) ions have been generated by mass spectrometric loss of .CO2H from the corresponding 1,4-dihydrobenzoic acids (3) and (4), and their fragmentations after ca. 10 μs have been investigated by means of mass-analysed ion kinetic energy (MIKE) spectrometry of some 2H and 13C labelled analogues.Metastable C6H7(1+) ions eliminate H2 after proton randomization, whereas metastable C7H9(1+) ions expel both H2 and CH4 after incomplete proton equilibration.In particular, 40percent of C7H9(1+) ions randomize all their carbon and hydrogen atoms prior to loss of CH4, and 60percent of C7H9(1+) ions lose the original methyl group along with a hydrogen atom from the (proton-equilibrated) benzenium ring, accompanied by a slow and incomplete exchange between the hydrogen atoms of the ring and the methyl group.It is suggested that loss of both CH4 and H2 occur via the (ipso-)toluenium ion (2).The role of a non-classical C7H9(1+) isomer, phenylmethonium ion (6), is discussed since striking similarities are found compared * adducts from ion-molecule reactions described in the literature.

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