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33143-50-9

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33143-50-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 33143-50-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,3,1,4 and 3 respectively; the second part has 2 digits, 5 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 33143-50:
(7*3)+(6*3)+(5*1)+(4*4)+(3*3)+(2*5)+(1*0)=79
79 % 10 = 9
So 33143-50-9 is a valid CAS Registry Number.

33143-50-9Downstream Products

33143-50-9Relevant articles and documents

Bismuth-catalyzed direct substitution of the hydroxy group in alcohols with sulfonamides, carbamates, and carboxamides

Qin, Hongbo,Yamagiwa, Noriyuki,Matsunaga, Shigeki,Shibasaki, Masakatsu

, p. 409 - 413 (2007)

(Figure Presented) No preactivation of the alcohol substrates is required in allylic, propargylic, and benzylic aminations catalyzed by a combination of commercially available Bi(OTf)3 and KPF6, mostly at room temperature (see scheme). The substitution reactions of readily accessible allylic, propargylic, and benzylic alcohols with sulfonamides, carbamates, and carboxamides give the desired amine products in up to 99% yield.

Aluminum triflate as a powerful catalyst for direct amination of alcohols, including electron-withdrawing group-substituted benzhydrols

Ohshima, Takashi,Ipposhi, Junji,Nakahara, Yasuhito,Shibuya, Ryozo,Mashima, Kazushi

supporting information, p. 2447 - 2452 (2012/11/07)

Direct aminations of allylic alcohols, benzylic alcohols, and benzhydrols with electron-withdrawing (F, Br, I, NO2, or CN) substituents were efficiently catalyzed by aluminum triflate [Al(OTf)3] to afford the corresponding biarylamines in high yield, and the dibromo-substituted product was further transformed into letrozole. Copyright

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