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21351-31-5

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21351-31-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21351-31-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,3,5 and 1 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 21351-31:
(7*2)+(6*1)+(5*3)+(4*5)+(3*1)+(2*3)+(1*1)=65
65 % 10 = 5
So 21351-31-5 is a valid CAS Registry Number.

21351-31-5Downstream Products

21351-31-5Relevant articles and documents

Lawesson's reagent for direct thionation of hydroxamic acids: Substituent effects on LR reactivity

Przychodzen, Witold

, p. 676 - 684 (2007/10/03)

To explore the generality and scope of direct thionation of hydroxamic acids (HAs), the reaction of various structurally diverse HAs with Lawesson's reagent was investigated. The yield of thiohydroxamic acid (THAs) is poor when HAs possess bulky acyl and/or N-substituents, acidic α-hydrogen atoms, or an N-phenyl ring. THAs yields were correlated with Brown sigma parameter. The relative rates of two subsequent processes kT2 and kR2 were also measured. Correlation was also found for methine proton chemical shifts of N-isopropyl benzothiohydroxamic acids.

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