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91523-31-8

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91523-31-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 91523-31-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,5,2 and 3 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 91523-31:
(7*9)+(6*1)+(5*5)+(4*2)+(3*3)+(2*3)+(1*1)=118
118 % 10 = 8
So 91523-31-8 is a valid CAS Registry Number.

91523-31-8Relevant articles and documents

Intramolecular Cyclization with Nitrenium Ions Generated from N-Chloro-N-methoxyamides in Neutral Conditions

Kikugawa, Yasuo,Shimada, Masahiro

, p. 1771 - 1774 (1987)

Intramolecular aromatic substitution by a N-chloro-N-methoxyamide group to a suitably situated aromatic ring in the molecule is performed by using anhydrous zinc acetate and nitromethane as solvent to give nitrogen heterocycles in good yield.

A new synthesis of N-alkoxy-2-ethoxyarylacetamides from N-alkoxy-N-chloroarylacetamides with triethylamine in ethanol

Kikugawa,Shimada,Kato,Sakamoto

, p. 2192 - 2194 (2007/10/02)

Treatment of N-alkoxy-N-chloroarylacetamides with triethylamine in ethanol results in removal of a chlorine atom and introduction of an ethoxy group at the C-2 position of arylacetamides in moderate yields.

N-ALKOXY-N-ACYLNITRENIUM IONS IN INTRAMOLECULAR AROMATIC ADDITION REACTIONS

Glover, Stephen A.,Goosen, Andre,McCleland, Cedric W.,Schoonraad, Johan L.

, p. 2577 - 2592 (2007/10/02)

N-alkoxy-N-acylnitrenium ions are generated by treatment of N-alkoxy-N-chloroamides with silver ions in ethereal solvents.These intermediates readily cyclise onto aromatic nuclei on alkoxy side-chains to give benzoxazines and benzoxazepines and on the acyl side-chains to give γ, δ and ε benzolactams.Spirane products are formed by ipso addition when a 4-methoxy substituent is present on the side-chain aromatic rings.The yields and regioselectivities of these reactions have been ascribed to different transition structures for cyclisation onto the acyl and alkoxy side-chains which involve respectively an exocyclic and endocyclic N-O ?-bond.Evidence for this exeptionally high ?-bond character has been obtained from MNDO calculations which predict a ?-bond order of 0.9 and a rotational barrier of 29.7 kcalmol-1

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