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137121-50-7

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137121-50-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 137121-50-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,1,2 and 1 respectively; the second part has 2 digits, 5 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 137121-50:
(8*1)+(7*3)+(6*7)+(5*1)+(4*2)+(3*1)+(2*5)+(1*0)=97
97 % 10 = 7
So 137121-50-7 is a valid CAS Registry Number.

137121-50-7Relevant articles and documents

Z -isomerization of retinoids through combination of monochromatic photoisomerization and metal catalysis

Kahremany, Shirin,Sander, Christopher Lane,Tochtrop, Gregory P.,Kubas, Adam,Palczewski, Krzysztof

supporting information, p. 8125 - 8139 (2019/09/19)

Catalytic Z-isomerization of retinoids to their thermodynamically less stable Z-isomer remains a challenge. In this report, we present a photochemical approach for the catalytic Z-isomerization of retinoids using monochromatic wavelength UV irradiation treatment. We have developed a straightforward approach for the synthesis of Z-retinoids in high yield, overcoming common obstacles normally associated with their synthesis. Calculations based on density functional theory (DFT) have allowed us to correlate the experimentally observed Z-isomer distribution of retinoids with the energies of chemically important intermediates, which include ground- and excited-state potential energy surfaces. We also demonstrate the application of the current method by synthesizing gram-scale quantities of 9-cis-retinyl acetate 9Z-a. Operational simplicity and gram-scale ability make this chemistry a very practical solution to the problem of Z-isomer retinoid synthesis.

Process for producing retinol and intermediate compounds for producing the same

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Page 14, (2010/01/31)

There are disclosed a disulfone compound of formula (1): wherein Ar denotes an aryl group that may have a substituent, R1 denotes a hydrogen atom or a protective group of a hydroxyl group and the wavy ine means that the disulfone compound is an E or Z geometrical isomer or i mixture thereof,a method for producing the same,intermediate compounds therefore anda process for producing retinol through the disulfone compound.

Electro-organic Reactions. Part 20. Electrogenerated Bases, Ylide Formation, and Wittig Alkene Synthesis

Mehta, Raj R.,Pardini, Vera L.,Utley, James H. P.

, p. 2921 - 2926 (2007/10/02)

Dicyano(fluoren-9-ylidene)methane (1a), dicyano(2,7-dibromofluoren-9-ylidene)methane (1b), and ethyl 2-cyano-2-fluoren-9-ylideneacetate (1c) may be cathodically reduced in N,N-dimethylforamide to give dianions which efficiently convert phosphonium salts into ylides.The potentials required are sufficiently modest to allow the electrogeneration of the bases in the presence of several phosphonium salts and of several aldehydes to give a convenient method of carrying out the Wittig alkene synthesis.This method has been explored for the synthesis of stilbene, 1,4-diphenylbutadiene, and vitamin A acetate.The basicity of the dianions varies according to the choice of electrolyte cation (Bu4N+ or Li+).The cations also have a marked effect on the stereochemical course of the reaction and, in particular, mixtures of alkenes are obtained in which the cis-isomer predominates in the presence of lithium ion; in the vitamin A acetate synthesis, the 11-cis-isomer constitutes 76percent of the product.The results are consistent with recent hypotheses concerning the mecahnism of the Wittig reaction.

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