27757-79-5 Usage
General Description
3-hydroxy-4-(phenylazo)-2-naphthoic acid, also known as Sudan III, is a synthetic azo dye commonly used to detect the presence of fats and oils in various materials such as food and textile products. It is often used as a staining agent in histology and is also employed in the manufacturing of printing inks and lipsticks. However, 3-hydroxy-4-(phenylazo)-2-naphthoic acid has been banned in some countries due to its potential health risks, as it has been linked to cancer and other serious health issues. Its use is strictly regulated, and there are ongoing efforts to find safer alternatives to this chemical in various applications.
Check Digit Verification of cas no
The CAS Registry Mumber 27757-79-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,7,7,5 and 7 respectively; the second part has 2 digits, 7 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 27757-79:
(7*2)+(6*7)+(5*7)+(4*5)+(3*7)+(2*7)+(1*9)=155
155 % 10 = 5
So 27757-79-5 is a valid CAS Registry Number.
InChI:InChI=1/2C17H12N2O3.Ca/c2*20-16-14(17(21)22)10-11-6-4-5-9-13(11)15(16)19-18-12-7-2-1-3-8-12;/h2*1-10,18H,(H,21,22);/q;;+2/p-2/b2*19-15+;
27757-79-5Relevant articles and documents
Photochemistry of p-benzoquinone diazide carboxylic acids: Formation of 2,4-didehydrophenols
Sander, Wolfram,Bucher, G?tz,Wandel, Holger,Kraka, Elfi,Cremer, Dieter,Sheldrick, William S.
, p. 10660 - 10672 (2007/10/03)
The photochemistry of p-benzoquinone diazide carboxylic acids (7) was studied using matrix isolation spectroscopy, product analysis, and high-level ab initio molecular orbital theory. The general photochemical pathway observed includes primary carbene formation, followed by secondary photodecarboxylation to yield derivatives of 2,4-didehydrophenol 9. CCSD(T) calculations on the parent 2,4-didehydrophenol (9a) lead to an infrared spectrum which is in excellent agreement with the experiment alone. Furthermore; calculations predict 9a to be characterized by a distorted benzene ring with the hydroxy group pointing toward the radical center in ortho position. The heat of formation of 9a is predicted to be 85 kcal/mol. Its formation from 1-oxo-2,5-cyclohexadien-4-ylidene-2-carboxylic acid (8a) by decarboxylation is exothermic by 30 kcal/mol where strong H-bonding in 8a can be considered to facilitate the formation of 9a.
