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253161-05-6

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253161-05-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 253161-05-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,3,1,6 and 1 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 253161-05:
(8*2)+(7*5)+(6*3)+(5*1)+(4*6)+(3*1)+(2*0)+(1*5)=106
106 % 10 = 6
So 253161-05-6 is a valid CAS Registry Number.

253161-05-6Relevant articles and documents

Inter- and intramolecular pathways for the formation of tetrahydrofurans from β-(phosphatoxy)alkyl radicals. Evidence for a dissociative mechanism

Crich, David,Huang, Xianhai,Newcomb, Martin

, p. 523 - 529 (2007/10/03)

β-(Phosphatoxy)alkyl radicals generated by photolysis of Barton PTOC esters in the presence of allyl alcohol and tert-butyl mercaptan undergo nucleophilic substitution followed by 5-exo-trig radical ring closure leading to tetrahydrofurans in good yield and with high trans selectivity. β- (Phosphatoxy)alkyl radicals obtained by intramolecular hydrogen 1,5- abstraction with an alkoxyl radical undergo nucleophilic displacement providing tetrahydrofurans. The ensemble of results, including the effects of leaving groups and substituents, strongly support a dissociative mechanism for these radical nucleophilic displacement reactions.

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