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20035-14-7

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20035-14-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20035-14-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,0,3 and 5 respectively; the second part has 2 digits, 1 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 20035-14:
(7*2)+(6*0)+(5*0)+(4*3)+(3*5)+(2*1)+(1*4)=47
47 % 10 = 7
So 20035-14-7 is a valid CAS Registry Number.

20035-14-7Downstream Products

20035-14-7Relevant articles and documents

H4SiW12O40-catalyzed cyclization of epoxides/aldehydes and sulfonyl hydrazides: An efficient synthesis of 3,4-disubstituted 1H-pyrazoles

Cheng, Mengyuan,Cheng, Yuanyuan,Gao, Xiaofei,Li, Ke,Lin, Xiaoling,Liu, Yufeng,Xie, Xuanjie,Yang, Guoping

supporting information, (2021/09/06)

A simple and efficient method for the synthesis of pyrazoles through a silicotungstic acid (H4SiW12O40)-catalyzed cyclization of epoxides/aldehydes and sulfonyl hydrazides has been developed. Various epoxides/aldehydes were smoothly reacted with sulfonyl hydrazides to furnish regioselectivity 3,4-disubstituted 1H-pyrazoles. The application of such an earth-abundant, readily accessible, and nontoxic catalyst provides a green approach for the construction of 3,4-disubstituted 1H-pyrazoles. A plausible reaction mechanism has been proposed on the basis of control experiments, GC-MS and DFT calculations.

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