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5289-18-9

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5289-18-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 5289-18-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,2,8 and 9 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 5289-18:
(6*5)+(5*2)+(4*8)+(3*9)+(2*1)+(1*8)=109
109 % 10 = 9
So 5289-18-9 is a valid CAS Registry Number.

5289-18-9Relevant articles and documents

Regioselective Decarboxylative Cycloaddition Route to Fully Substituted 3-CF3-Pyrazoles from Nitrilimines and Isoxazolidinediones

Tian, Yu-Chen,Li, Jun-Kuan,Zhang, Fa-Guang,Ma, Jun-An

, p. 2093 - 2097 (2021/03/15)

1,4-Diaryl-5-carboxamido substituted 3-trifluoromethylpyrazoles are obtained with exclusive regioselectivity under transition-metal-free conditions. This decarboxylative [3+2] cycloaddition protocol was enabled by employing trifluoromethyl nitrilimines as 1,3-dipoles, and isoxazolidinediones as CO2-masked alkynyl dipolarophiles. The applicability of this method is further manifested by its compatibility with difluoromethyl, alkyl, aryl, and heteroaryl nitrilimines, as well as the preparation of 4-carboxylic amido analogue of drug Celebrex. (Figure presented.).

4-benzylidene -2-aryl isoxazolidine -3,5- diketone and preparation method thereof

-

Paragraph 0014-0018, (2020/03/25)

The invention provides 4 -benzyl - 2 2-aryl isoxazolidin- 33335-dione and a preparation method, thereof, and the molecule has the formula (I) in the structure, Ar1 AND Ar2 A method. of synthesizing 4 -arylisoxazolidine - 3333,5-dione

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