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21243-68-5

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21243-68-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21243-68-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,2,4 and 3 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 21243-68:
(7*2)+(6*1)+(5*2)+(4*4)+(3*3)+(2*6)+(1*8)=75
75 % 10 = 5
So 21243-68-5 is a valid CAS Registry Number.
InChI:InChI=1/C14H14O3/c15-9-12-8-11(3-6-14(12)17)7-10-1-4-13(16)5-2-10/h1-6,8,15-17H,7,9H2

21243-68-5Downstream Products

21243-68-5Relevant articles and documents

Spectral assignments and reference data: A 13C NMR study of the methylol derivatives of 2,4′- and 4,4′-dihydroxydiphenylmethanes found in resol phenol-formaldehyde resins

Fisher, Thomas H.,Chao, Ping,Upton, Cindy G.,Day, Anthony J.

, p. 747 - 751 (2007/10/03)

A total of 13 of the 16 possible methylol derivatives of 2,4′- and 4,4′-dihydroxydiphenylmethane have been synthesized, isolated, and identified. These compounds are found as intermediates in the cure process of resol phenol-formaldehyde (PF) resins. Analysis of the 13C NMR spectra (in acetone-d6) of these compounds provided a way to evaluate the seven methylolphenol ring types (methylol derivatives of 2-hydroxyphenyl and 4-hydroxyphenyl rings) found in typical resol PF resins using the ipso carbon region from 150 to 160 ppm. A simple diagnostic test was developed using the chemical shift values of the methylol methylene carbon atoms to identify the presence of intermediates containing either a 2-hydroxyphenyl or a 4-hydroxyphenyl ring. Using these data it is now possible to analyze the major components in extracted prepreg PF resins. Copyright

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