99-11-6 Usage
Chemical Properties
yellow powder
Uses
Different sources of media describe the Uses of 99-11-6 differently. You can refer to the following data:
1. 2,6-Dihydroxypyridine-4-carboxylic acid was used to prepare 2,6-dibromo-4-(hexoxymethyl)pyridine. It was also used to synthesize the derivatives of oxazinones and pyrimidinones.
2. 2,6-Dihydroxypyridine-4-carboxylic acid (citrazinic acid) was used to prepare 2,6-dibromo-4-(hexoxymethyl)pyridine. It was also used to synthesize the derivatives of oxazinones and pyrimidinones.
Purification Methods
The acid is normally a yellow powder with a greenish shade, but is white when ultra pure and turns blue on long standing. It is insoluble in H2O but slightly soluble in hot HCl and soluble in alkali or carbonate solutions. It is purified by precipitation from alkaline solutions with dilute HCl, and dried in a vacuum over P2O5. The ethyl ester has m 232o (evacuated tube) and a pKa of 4.81 in MeOCH2CH2OH [IR: Pitha Coll Czech Chem Comm 28 1408 1963]. [Beilstein 22/7 V 24.]
Check Digit Verification of cas no
The CAS Registry Mumber 99-11-6 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 9 and 9 respectively; the second part has 2 digits, 1 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 99-11:
(4*9)+(3*9)+(2*1)+(1*1)=66
66 % 10 = 6
So 99-11-6 is a valid CAS Registry Number.
InChI:InChI=1/C6H5NO4/c8-4-1-3(6(10)11)2-5(9)7-4/h1-2H,(H,10,11)(H2,7,8,9)/p-1
99-11-6Relevant articles and documents
Synthesis method of citrazinic acid
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Paragraph 0010; 0012; 0013, (2018/07/06)
The invention belongs to the technical field of compound preparation and particularly relates to a synthesis method of citrazinic acid. The method adopts a hydrothermal reaction method of citric acidand urea and particularly comprises the steps of dissolving citric acid and urea in deionized water, performing ultrasound dispersion and intensive mixing, performing a hydrothermal reaction under a certain temperature condition in a reaction kettle, performing high-speed centrifugation on reaction liquid at last, removing a supernate, and drying an obtained yellow precipitate, namely a citrazinicacid product with good color, high yield and high purity. The method is mild in reaction condition, and simple to operate; one-step sulfuric acid hydrolysis is required only, and the product is highin purity (greater than 96%) and productivity (70-85%).
