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109640-28-0

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109640-28-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 109640-28-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,9,6,4 and 0 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 109640-28:
(8*1)+(7*0)+(6*9)+(5*6)+(4*4)+(3*0)+(2*2)+(1*8)=120
120 % 10 = 0
So 109640-28-0 is a valid CAS Registry Number.

109640-28-0Relevant articles and documents

Synthesis of Highly Stereodefined Tetrasubstituted Acyclic All-Carbon Olefins via a Syn-Elimination Approach

Lim, Ngiap-Kie,Weiss, Patrick,Li, Beryl X.,McCulley, Christina H.,Hare, Stephanie R.,Bensema, Bronwyn L.,Palazzo, Teresa A.,Tantillo, Dean J.,Zhang, Haiming,Gosselin, Francis

supporting information, p. 6212 - 6215 (2017/11/24)

An efficient synthesis of stereodefined tetrasubstituted acyclic all-carbon olefins has been developed via a bis(2,6-xylyl)phosphate formation of stereoenriched tertiary alcohols, followed by in situ syn-elimination of the corresponding phosphates under mild conditions. This chemistry tolerates a wide variety of electronically and sterically diverse substrates and generates the desired tetrasubstituted olefins in high yields and stereoselectivities (>95:5) in most cases. This stereocontrolled olefin synthesis has been applied to the synthesis of anticancer drug tamoxifen in three steps from commercially available 1,2-diphenylbutan-1-one in 97:3 stereoselectivity and 78% overall yield.

Synthesis, Conformational Considerations, and Estrogen Receptor Binding of Diastereoisomers and Enantiomers of 1-phenyl>-1,2-diphenylbutane (Dihydrotamoxifen)

McCague, Raymond,Leclercq, Guy

, p. 1761 - 1767 (2007/10/02)

As part of a study into nonisomerizable antiestrogens, the diastereoisomeric dihydrotamoxifens 7 and 8 were prepared by catalytic transfer hydrogenation of (Z)- and (E)-tamoxifen and were shown by NMR spectrometry to exist in preferred conformations with hydrogen atoms in an antiperiplanar relationship.The corresponding 4-hydroxy derivatives 9 and 10 were prepared from hydrogenated precursors of (Z)- and (E)-4-hydroxytamoxifen.The relative binding affinities (RBA) of the compounds to estrogen receptors are consistent with the assigned conformations and parallel reported data on derivatives of the nonsteroidal estrogen hexestrol.The growth-inhibitory activity against the MCF-7 human breast cancer cell line in vitro was for 10 comparable to that of 4-hydroxytamoxifen, although increasing the concentration from 10-8 to 10-6 M did not significantly improve the growth inhibition.The derivative 9 analogous to (E)-4-hydroxytamoxifen antagonized the growth-stimulating effect of added estradiol and is therefore also an antiestrogen but at low concentration (10-8 M) in the absence of estradiol, MCF-7 cell growth was stimulated, indicating an estrogenic influence.The enantiomers of the dihydrotamoxifen 8 were individually prepared from the resolved enantiomers of 2-phenylbutanoic acid, the key reaction step being a lithium-ammonia reduction of the 1-(4-methoxyphenyl)-1,2-diphenyl-1-butanol to generate the triphenylbutane.The enantiomers of 8 gave identical RBA values in cytosol.

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