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40998-93-4

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40998-93-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 40998-93-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,0,9,9 and 8 respectively; the second part has 2 digits, 9 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 40998-93:
(7*4)+(6*0)+(5*9)+(4*9)+(3*8)+(2*9)+(1*3)=154
154 % 10 = 4
So 40998-93-4 is a valid CAS Registry Number.

40998-93-4Downstream Products

40998-93-4Relevant articles and documents

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Petersen

, p. 1743 (1955)

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Chemoselective Cross-Coupling of gem-Borazirconocene Alkanes with Aryl Halides

Bai, Songlin,Gao, Yadong,Jiang, Chao,Qi, Xiangbing,Yang, Chao

supporting information, p. 11506 - 11513 (2020/07/14)

The direct and chemoselective conversion of the carbon-metal bond of gem-dimetallic reagents enables rapid and sequential formation of multiple carbon-carbon and carbon-heteroatom bonds, thus representing a powerful method for efficiently increasing structural complexity. Herein, we report a visible-light-induced, nickel-catalyzed, chemoselective cross-coupling reaction between gem-borazirconocene alkanes and diverse aryl halides, affording a wide range of alkyl Bpin derivatives in high yields with excellent regioselectivity. This practical method features attractively simple reaction conditions and a broad substrate scope. Additionally, we systematically investigated a Bpin-directed chain walking process underlying the regioselectivity of alkylzirconocenes, thus uncovering the mechanism of the remote functionalization of internal olefins achieved with our method. Finally, DFT calculations indicate that the high regioselectivity of this reaction originates from the directing effect of the Bpin group.

Potential organ- or tumor-imaging agents. XXII Acyl-labeled cholesterol esters

Seevers,Schwendner,Swayze,Counsell

, p. 618 - 621 (2007/10/02)

A series of cholesteryl phenylalkanoic esters was synthesized in which the acyl moiety served as the carrier for radioiodine. Tissue distribution studies in rats revealed that several of these radioiodinated esters selectively accumulated in steroid-secre

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