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75421-25-9

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75421-25-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 75421-25-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,5,4,2 and 1 respectively; the second part has 2 digits, 2 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 75421-25:
(7*7)+(6*5)+(5*4)+(4*2)+(3*1)+(2*2)+(1*5)=119
119 % 10 = 9
So 75421-25-9 is a valid CAS Registry Number.

75421-25-9Downstream Products

75421-25-9Relevant articles and documents

Dynamic Equilibria between Pentavalent Protonated Oxyphosphoranes and Their Isomeric Tetravalent Enol Phosphonium Ions via Inter- and Intramolecular Proton Transfer

Castelijns, Marianne M. C. F.,Schipper, Pieter,Aken, Dirk van,Buck, Henk M.

, p. 47 - 53 (1981)

Low-temperature NMR (1H, 13C, 31P) measurements of the reaction of several pentavalent oxyphosphoranes with FSO3H in CH2Cl2 are described.Rapid equilibria between the neutral oxyphosphoranes and the enol phosphonium ions involving an intermolecular proton transfer can be obtained by implying certain structural constraints on the system, which means that less entropy has to be expended in order to obtain the rigid closed form of the protonated oxyphosphorane.Moreover, in one case evidence is presented for an intramolecular proton-exchange process which is also controlled by an intermediary pentavalent protonated oxyphosphorane.These reactions may be regarded as a model for intramolecular (biological) phosphorylation processes.

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