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73841-20-0

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73841-20-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 73841-20-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,3,8,4 and 1 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 73841-20:
(7*7)+(6*3)+(5*8)+(4*4)+(3*1)+(2*2)+(1*0)=130
130 % 10 = 0
So 73841-20-0 is a valid CAS Registry Number.

73841-20-0Downstream Products

73841-20-0Relevant articles and documents

Generation of 2,3-Benzobicyclo<2.2.1)hept-2-ene-5,7-diyl Diradicals via Denitrogenation of Appropriate Azoalkanes and Their Mechanistic Implications in the Di-?-methane Rearrangement of Benzonorbornadienes

Adam, Waldemar,Lucchi, Ottorino De

, p. 4133 - 4138 (2007/10/02)

The azoalkanes 16a-c, prepared from the bicycloalkadienes 5a-c via dipolar cycloaddition with 4-methyl-1,2,4-triazoline-3,5-dione (MTAD) and subsequent oxidative hydrolysis, were submitted to thermal and direct and ketone-sensitized photochemical denitrogenation, with the intention of entering the diradical manifold postulated for the di-?-methane rearrangement.It is shown that in each case denitrogenation leads to the expected 2,3-benzobicyclohept-2-ene-5,7-diyl diradical 7.Diradical 7 mostly cyclizes into the corresponding tricycloalkene 8, and only a very small fraction (5percent) suffers retro-di-?-methane rearrangement into the bicycloalkadiene 5 via the cyclopropyl dicarbinyl radical 6.Stabilizing substituents such as benzhydryl and spirocyclopropyl groups in a position α to the rearranging radical site in 7 discourage retro-di-?-methane reaction.

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