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4953-05-3

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4953-05-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 4953-05-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,9,5 and 3 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 4953-05:
(6*4)+(5*9)+(4*5)+(3*3)+(2*0)+(1*5)=103
103 % 10 = 3
So 4953-05-3 is a valid CAS Registry Number.

4953-05-3Relevant articles and documents

Synthesis and chemiluminescent activity of pyridazino[4,5-b]indole-1,4(2H,3H)-diones

Kurumi, Masateru,Sasaki, Kenji,Takata, Hiroko,Nakayama, Taiji

, p. 2809 - 2819 (2007/10/03)

Substituted and non-substituted anilines were transformed to the corresponding triazole derivatives, which were converted to dimethyl indole-2,3-dicarboxylates by photocyclization. The reaction of diester with hydrazine hydrate gave 1,2,3,4-tetrahydro-5H-

SITE SELECTIVITY IN THE REACTIONS OF 1,3-DIPOLES WITH NORBORNADIENE DERIVATIVES

Cristina, D.,Amici, M. De,Micheli, C. De,Gandolfi, R.

, p. 1349 - 1357 (2007/10/02)

The cycloadditions of arylazides, benzonitrile oxides and diphenylnitrile imine to norbornadiene derivatives 1a-c showed varying degree of site- and stereo-selectivity.With dipolarophile 1a arylazides and benzonitrile oxides attack, preferentially, the electron-poor tetrasubstituted double bond, while in the case of 1b and 1c is the substituted double bond which enters the cycloaddition.By contrast, 2-diazopropane and C-phenyl-N-methylnitrone react with the sole tetrasubstituted double bond of 1a-c in stereo- and site-specific cycloadditions.The quantitative evaluation of the two possible reaction paths was performed by glc analysis.The compounds detected were those arising from Diels-Alder cycloreversions of the thermally labile intermediate adducts 2 and 3 (Scheme 1).The results were rationalized on the basis of a qualitative perturbation treatment which considers frontier orbital interactions only.

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