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70004-62-5

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70004-62-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 70004-62-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,0,0,0 and 4 respectively; the second part has 2 digits, 6 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 70004-62:
(7*7)+(6*0)+(5*0)+(4*0)+(3*4)+(2*6)+(1*2)=75
75 % 10 = 5
So 70004-62-5 is a valid CAS Registry Number.

70004-62-5Relevant articles and documents

The Photo-cycloaddition of Enol Ethers to Benzene

Gilbert, Andrew,Taylor, Grahame N.,Samsudin, Mohd. Wahid bin

, p. 869 - 876 (2007/10/02)

The photo-reactions of benzene with ethyl vinyl ether, n-butyl vinyl ether, 1,1-dimethoxyethylene, 2,3-dihydropyran, 2,3-dihydrofuran, 2,3-dihydro-1,4-dioxin, and 1,3-dioxole are described.The meta-photo-cycloaddition of ethyl vinyl ether and n-butyl vinyl ether to benzene shows little selectivity, and regio- and stereo-isomers are isolated. ortho-Cycloaddition is observed from all systems but only with 2,3-dihydrofuran as addend are both stereoisomers of the adduct formed, and although the exo-isomer is very photolabile, the endo-product is essentially stable under its conditions of formation.The ortho-cycloaddition of 1,1-dimethoxyethylene to benzene provides the first step in a convenient synthesis of cyclo-octatrienone.Contrary to previous proposals there is little correlation between the stereochemistry of the ortho-cycloaddition and preferred orientation of the addends in the ground state.The relationship between the relative efficiency of the two addition modes and ionisation potential of the ethylene is discussed.

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