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205999-89-9

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205999-89-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 205999-89-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,5,9,9 and 9 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 205999-89:
(8*2)+(7*0)+(6*5)+(5*9)+(4*9)+(3*9)+(2*8)+(1*9)=179
179 % 10 = 9
So 205999-89-9 is a valid CAS Registry Number.

205999-89-9Relevant articles and documents

The new life of traditional water treatment flocculant polyaluminum chloride (PAC): A green and efficient micro-nano reactor catalyst in alcohol solvents

Bi, Shuxian,Hao, Pengcheng,Li, Xiang,Liang, Yanping,Liang, Yuwang,Liu, Wanyi,Wang, Gang,Wen, Jiantong,Zhan, Haijuan

, p. 655 - 663 (2022/01/22)

Polyaluminum chloride (PAC) is an inorganic polymer material that has the advantages of a simple preparation process and special electronic structure. It is considered to be the most efficient and widely used flocculation material for water treatment. In

Preparation method of 3,4-dihydropyrimidine-2(1H)-one compound

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Paragraph 0021-0022; 0030-0032, (2020/09/30)

The invention discloses a preparation method of a 3,4-dihydropyrimidine-2(1H)-one compound, wherein the comprises the steps: (1) respectively adding reaction substrate raw materials aromatic aldehydes, 1,3-diketone ester, urea and a trace amount of water

Method for catalytically synthesizing 3, 4-dihydropyrimidine-2 (1H)-ketone in green manner

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Paragraph 0014; 0015; 0016; 0018-0029; 0054-0056, (2018/10/19)

The invention discloses green catalytic Biginelli reaction, and discloses a method for synthesizing 3, 4-dihydropyrimidine-2 (1H)-ketone and derivatives thereof by the aid of 'one-pot processes'. Resin D732 is used as a catalyst, ethyl alcohol is used as a solvent, and the usage of the catalyst is 0.2g/1mmoL aldehyde. The method includes carrying out reflux reaction at the temperatures of 78 DEG Cfor 1-5 hours; filtering out the resin after the reaction is completely carried out; cooling filter liquor by the aid of ice water and then carrying out filter, ethyl alcohol re-crystallization and drying to obtain pure products. Compared with the traditional methods for synthesizing 3, 4-dihydropyrimidine-2 (1H)-ketone by the aid of acid used as a catalyst, the method has the obvious advantagesthat reaction conditions are mild, the method is high in efficiency, short in time and easy to operate, only few byproducts can be generated, and the products have good colors and are high in purity;particularly, the resin D732 used as the catalyst is low in cost, easy to prepare, store and transport and good in repeatability, is easily available and is green and environmentally friendly, accordingly, the method has an excellent industrial application prospect, and the like.

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