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173935-82-5

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173935-82-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 173935-82-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,3,9,3 and 5 respectively; the second part has 2 digits, 8 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 173935-82:
(8*1)+(7*7)+(6*3)+(5*9)+(4*3)+(3*5)+(2*8)+(1*2)=165
165 % 10 = 5
So 173935-82-5 is a valid CAS Registry Number.

173935-82-5Downstream Products

173935-82-5Relevant articles and documents

Application of radical cyclisation/iodine atom transfer to the chiral synthesis of (-)-methylenolactocin

Mawson, Simon D.,Weavers, Rex T.

, p. 11257 - 11270 (2007/10/02)

Methylenolactocin, an antitumour antibiotic, has been synthesized through an efficient radical cyclisation process on a chiral iodo acetylene ester. Chiral iodohydrins may be formed by regioselective opening of a chiral epoxy ester, prepared by Sharpless epoxidation. C-2 opening is achieved with TMSCl/NaI and C-3 attack with MgI2. Subsequent esterification of the 2-iodo compound by reaction with substituted propynoyl triflates gives the key iodo acetylenic esters. This route is highly adaptable to the synthesis of analogues.

A general stereospecific synthesis of γ-hydroxy-α,β-unsaturated esters

Thijs,Dommerholt,Leemhuis,Zwanenburg

, p. 6589 - 6592 (2007/10/02)

A stereospecific synthesis of optically active γ-hydroxy-α,β-unsaturated esters is achieved, involving successively the Sharpless epoxidation of allylic alcohols, oxidation to glycidic acids, conversion into α,β-epoxy diazomethyl ketones, and irradiation in ethanol at 300 nm. Intermediates in the photo-induced rearrangement are epoxy ketenes, which undergo ethanolysis with simultaneous opening of the epoxide, preferably via a transition state involving the s-trans conformation.

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