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94269-75-7

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94269-75-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 94269-75-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,2,6 and 9 respectively; the second part has 2 digits, 7 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 94269-75:
(7*9)+(6*4)+(5*2)+(4*6)+(3*9)+(2*7)+(1*5)=167
167 % 10 = 7
So 94269-75-7 is a valid CAS Registry Number.

94269-75-7Relevant articles and documents

Diels-Alder Reactions of Protoporphyrin IX Dimethyl Ester with Electron-Deficient Alkynes

Pangka, Veronica Scherrer,Morgan, Alan R.,Dolphin, David

, p. 1094 - 1100 (2007/10/02)

The vinyl and cross-conjugated porphyrin β,β' double bonds of either ring A or B of protoporphyrin IX dimethyl ester react in a cycloaddition with electron-deficient acetylenes.The methyl and ethyl esters of acetylenedicarboxylic acid and β-(phenylsulfonyl)propiolic acid react to give the corresponding chlorins with the ring A and B isomers being readily separable by chromatography.The initial products are rearranged by treatment with base.Reaction with triethylamine or 1,5-diazabicycloundec-5-ene gave, in every case, two diastereomers, where theformer rearrangement led to the kinetically controlled and the latter the thermodynamically controlled products.The Diels-Alder reaction with the unsymmetric acetylenes is both regio- and stereospecific.

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