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40626-61-7

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40626-61-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 40626-61-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,0,6,2 and 6 respectively; the second part has 2 digits, 6 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 40626-61:
(7*4)+(6*0)+(5*6)+(4*2)+(3*6)+(2*6)+(1*1)=97
97 % 10 = 7
So 40626-61-7 is a valid CAS Registry Number.

40626-61-7Downstream Products

40626-61-7Relevant articles and documents

Visible light-promoted metal-free C-H activation: Diarylketone-catalyzed selective benzylic mono- and difluorination

Xia, Ji-Bao,Zhu, Chen,Chen, Chuo

, p. 17494 - 17500 (2014/01/06)

We report herein an operationally simple method for the direct conversion of benzylic C-H groups to C-F. We show that visible light can activate diarylketones to abstract a benzylic hydrogen atom selectively. Adding a fluorine radical donor yields the benzylic fluoride and regenerates the catalyst. The selective formation of mono- and difluorination products can be achieved by catalyst control. 9-Fluorenone catalyzes benzylic C-H monofluorination, while xanthone catalyzes benzylic C-H difluorination. The scope and efficiency of this new C-H fluorination method are significantly better than those of the existing methods. This is also the first report of selective C-H gem-difluorination.

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