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49784-74-9

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49784-74-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 49784-74-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,9,7,8 and 4 respectively; the second part has 2 digits, 7 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 49784-74:
(7*4)+(6*9)+(5*7)+(4*8)+(3*4)+(2*7)+(1*4)=179
179 % 10 = 9
So 49784-74-9 is a valid CAS Registry Number.

49784-74-9Relevant articles and documents

Photochemical Reactions of Arenecarboxylic Acid Esters with Electron-Rich Alkenes: 2 + 2 Cycloaddition, Hydrogen Abstraction, and Cycloreversion

Cantrell, Thomas S.,Allen, Andrew C.

, p. 135 - 139 (2007/10/02)

The photochemical reaction of arenecarboxylic acid methyl esters and isopropyl esters with alkenes has been examined and found to afford three types of products: (a) 2-alkoxyoxetanes 3 via a direct 2 + 2 cycloaddition to the substrate alkenes; (b) β,γ-unsaturated ketones 5 via hydrogen abstraction by the carbonyl oxygen of the photoexcited ester from an allylic position of the substrate alkene; and (c) alkoxyalkenes 4, which arise via 2 + 2 cycloreversion of the oxetanes 3.The quantum yields for the formation of the various products generally fell in the range 0.005-0.03, approximately 1 order of magnitude less than those of aryl ketones and aldehydes undergoing similar reactions.

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