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27957-93-3

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27957-93-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 27957-93-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,7,9,5 and 7 respectively; the second part has 2 digits, 9 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 27957-93:
(7*2)+(6*7)+(5*9)+(4*5)+(3*7)+(2*9)+(1*3)=163
163 % 10 = 3
So 27957-93-3 is a valid CAS Registry Number.

27957-93-3Relevant articles and documents

Complete synthesis of the antibiotic anisomycin

Felner,Schenker

, p. 754 - 763 (1970)

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Synthesis of α,ω-Bis-Enones by the Double Addition of Alkenyl Grignard Reagents to Diacid Weinreb Amides

Wiesler, Stefan,Bau, Michael A.,Niepel, Thomas,Younas, Sara L.,Luu, Hieu-Trinh,Streuff, Jan

, p. 6246 - 6260 (2019/09/10)

An efficient double addition of substituted alkenylmagnesium bromides to bis-Weinreb amides has been developed, giving α,ω-bis-enones that are building blocks for certain drugs and polymers. Furthermore, reliable protocols for the preparation of the requi

Synthesis of β-Lactams by Palladium(0)-Catalyzed C(sp3)?H Carbamoylation

Dailler, David,Rocaboy, Ronan,Baudoin, Olivier

supporting information, p. 7218 - 7222 (2017/06/13)

A general and user-friendly synthesis of β-lactams is reported that makes use of Pd0-catalyzed carbamoylation of C(sp3)?H bonds, and operates under stoichiometric carbon monoxide in a two-chamber reactor. This reaction is compatible with a range of primary, secondary and activated tertiary C?H bonds, in contrast to previous methods based on C(sp3)?H activation. In addition, the feasibility of an enantioselective version using a chiral phosphonite ligand is demonstrated. Finally, this method can be employed to synthesize valuable enantiopure free β-lactams and β-amino acids.

Enantioselective gold catalysis: Opportunities provided by monodentate phosphoramidite ligands with an acyclic TADDOL backbone

Teller, Henrik,Fluegge, Susanne,Goddard, Richard,Fuerstner, Alois

supporting information; experimental part, p. 1949 - 1953 (2010/06/21)

(Chemical Equation Presented) The tail makes the difference: Removing the isopropylidene acetal unit from well-known TADDOL ligands improved the performance of the derived phosphoramidite ligands in asymmetric gold catalysis (see scheme; Ts=4-toluenesulfonyl). X-ray crystallography showed that the binding pocket has an effective three-fold symmetry, with through-space interactions between the arene rings of the ligand and the gold center.

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