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52159-89-4

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52159-89-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 52159-89-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,2,1,5 and 9 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 52159-89:
(7*5)+(6*2)+(5*1)+(4*5)+(3*9)+(2*8)+(1*9)=124
124 % 10 = 4
So 52159-89-4 is a valid CAS Registry Number.

52159-89-4Downstream Products

52159-89-4Relevant articles and documents

Solvent/oxidant-switchable synthesis of multisubstituted quinazolines and benzimidazoles via metal-free selective oxidative annulation of arylamidines

Lin, Jian-Ping,Zhang, Feng-Hua,Long, Ya-Qiu

, p. 2822 - 2825 (2014/06/23)

A fast and simple divergent synthesis of multisubstituted quinazolines and benzimidazoles was developed from readily available amidines, via iodine(III)-promoted oxidative C(sp3)-C(sp2) and C(sp 2)-N bond formation in nonpolar and polar solvents, respectively. Further selective synthesis of quinazolines in polar solvent was realized by TEMPO-catalyzed sp3C-H/sp2C-H direct coupling of the amidine with K2S2O8 as the oxidant. No metal, base, or other additives were needed.

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