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4248-13-9

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4248-13-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 4248-13-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,2,4 and 8 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 4248-13:
(6*4)+(5*2)+(4*4)+(3*8)+(2*1)+(1*3)=79
79 % 10 = 9
So 4248-13-9 is a valid CAS Registry Number.

4248-13-9Relevant articles and documents

RE[N(SiMe3)2]3-Catalyzed Guanylation/Cyclization of Amino Acid Esters and Carbodiimides

Lu, Chengrong,Gong, Chao,Zhao, Bei,Hu, Lijuan,Yao, Yingming

, p. 1154 - 1159 (2018/02/10)

The example of rare-earth metal-catalyzed guanylation/cyclization of amino acid esters and carbodiimides is well-established, forming 4(3H)-2-alkylaminoquinazolinones in 65-96% yields. The rare-earth metal amides RE[N(TMS)2]3 (RE = Y, Yb, Nd, Sm, La; TMS = SiMe3) showed high activities, and La[N(TMS)2]3 performed best for a wide scope of the substrates.

Molybdenum-mediated synthesis of quinazolin-4(3H)-ones via cyclocarbonylation using microwave irradiation

Roberts, Bryan,Liptrot, David,Luker, Tim,Stocks, Michael J.,Barber, Catherine,Webb, Nicola,Dods, Robert,Martin, Barrie

supporting information; experimental part, p. 3793 - 3796 (2011/08/06)

A new, efficient and practical synthesis of quinazolin-4(3H)-ones is reported via molybdenum-mediated cyclocarbonylation using microwave irradiation. These methods allow access to a wide range of quinazolin-4(3H)-ones in reasonable yields without the need for gaseous carbon monoxide and palladium catalysts. A range of reactions illustrating the wide scope of this chemistry was carried out and all proceeded in reasonable yields.

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