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74338-89-9

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74338-89-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 74338-89-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,3,3 and 8 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 74338-89:
(7*7)+(6*4)+(5*3)+(4*3)+(3*8)+(2*8)+(1*9)=149
149 % 10 = 9
So 74338-89-9 is a valid CAS Registry Number.

74338-89-9Downstream Products

74338-89-9Relevant articles and documents

Highly selective sulfoxidation of allylic and vinylic sulfides by hydrogen peroxide using a flavin as catalyst

Linden, Auri A.,Krueger, Lars,Baeckvall, Jan-E.

, p. 5890 - 5896 (2007/10/03)

A highly chemoselective oxidation of allylic and vinylic sulfides to the corresponding sulfoxides has been developed using flavin 1 as the oxidation catalyst and hydrogen peroxide as the terminal oxidant. The sulfoxides were formed in good to excellent yields in a highly selective manner even when an excess of the oxidant was used. Sulfone formation was completely suppressed to 0.5% (in one single case 1.5% sulfone was detected). No epoxidation of double bonds or interference with other functional groups was observed under the reaction conditions. The general applicability was demonstrated by the selective oxidation of various allylic and vinylic sulfides having different electronic properties. A number of functionalities including hydroxy, acetoxy, amino, silyloxy, and formyl groups are tolerated under these mild reaction conditions.

Synthesis of Alkenyl Sulphoxides by Intramolecular and Intermolecular Addition of Sulphenic Acids to Alkynes

Bell, Richard,Cottam, Peter D.,Davies, John,Jones, D. Neville

, p. 2106 - 2115 (2007/10/02)

Alkyne-ω-sulphenic acids formed by thermolysis of ω-(t-butylsulphinyl)alkynes at 40 deg C cyclized regiospecifically to 2-methylenethiacycloalkane 1-oxides; 2-methylenethietan 1-oxide was not formed in this way. 2-Methylpropane-2-sulphenic acid, obtained by heating di-t-butyl sulphoxide, added regioselectively to oct-1-yne to give predominantly 2-t-butylsulphinyloct-1-ene, which itself decomposed thermally to a mixture of dioctenyl sulphoxides by way of alkenesulphenic acid-dialkyl sulphine interconversions.Benzenesulphenic acid, methanesulphenic acid, and ethoxycarbonylmethanesulphenic acid, conveniently generated by thermolysis of 1-cyano-2-alkyl(or aryl)sulphinylethanes, underwent intermolecular addition to unactivated and activated alkynes regioselectively to give alkenyl sulphoxides in good yields.

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