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32121-04-3

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32121-04-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 32121-04-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,2,1,2 and 1 respectively; the second part has 2 digits, 0 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 32121-04:
(7*3)+(6*2)+(5*1)+(4*2)+(3*1)+(2*0)+(1*4)=53
53 % 10 = 3
So 32121-04-3 is a valid CAS Registry Number.

32121-04-3Relevant articles and documents

High Chirality Transfer in Chiral Selenimides via Sigmatropic Rearrangement

Nishibayashi, Yoshiaki,Chiba, Takashi,Ohe, Kouichi,Uemura, Sakae

, p. 1243 - 1244 (1995)

The imination of chiral cinnamyl 2-(1-dimethylaminoethyl)ferrocenyl selenides with phenyliodinane and chloramine-T affords the corresponding chiral allylic amines via sigmatropic rearrangement of the selenimide intermediates with up to 87percent ee, highly diastereoselective imination of selenides and highly stereospecific sigmatropic rearrangement being shown.

Copper(I)-Catalyzed Enyne Oxidation/Cyclopropanation: Divergent and Enantioselective Synthesis of Cyclopropanes

Shen, Wen-Bo,Tang, Xiang-Ting,Zhang, Ting-Ting,Lv, Dong-Can,Zhao, Dan,Su, Tong-Fu,Meng, Lei

supporting information, p. 1285 - 1290 (2021/02/20)

An efficient copper(I)-catalyzed enyne oxidation/cyclopropanation for the modular synthesis of cyclopropane derivatives is described, which represents the first non-noble metal-catalyzed enynes oxidation/cyclopropanation by the in situ generated α-oxo copper carbenes. This protocol allows the assembly of valuable cyclopropane-γ-lactams in generally good to excellent yields with excellent diastereoselectivity. More significantly, the enantioselective version of enyne oxidation/cyclopropanation has been disclosed with chiral copper catalysts.

Lewis Base-Catalyzed Amino-Acylation of Arylallenes via C-N Bond Cleavage: Reaction Development and Mechanistic Studies

Xia, Ji-Bao,Yang, Yusheng,Yu, Zhi-Xiang,Zhang, Zheng-Bing

, p. 5419 - 5429 (2020/09/02)

Lewis base-catalyzed transformations of allenes have received much attention over the last decades. However, this type of reaction has so far been limited to activated allenes bearing an electron-withdrawing group. On the other hand, cleavage of an amide C-N bond to forge other chemical bonds has been widely reported but restricted to low atom economy due to the waste of the amine moiety of amides. We initiated a project of metal-catalyzed amino-acylation of allenes via cleavage of amide C-N bonds. Surprisingly, an amino-acylation of weakly activated aryl allenes was discovered via Lewis base catalysis, providing 2-methyl-3-aroylindole products, "privileged structures"in drug discovery. This is a unique example of Lewis base catalysis of weakly activated allenes, which was not reported yet. Extensive experimental and computational studies have been conducted to provide insight into the reaction mechanism. The nucleophilic addition of Lewis base catalyst to aryl allene is the rate-limiting step. A challenging [1,3]-proton transfer is realized by nitrogen anion intermediate assisted sequential [1,4]- and [1,6]-proton transfer in the reaction pathway.

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