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51209-53-1

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51209-53-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 51209-53-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,1,2,0 and 9 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 51209-53:
(7*5)+(6*1)+(5*2)+(4*0)+(3*9)+(2*5)+(1*3)=91
91 % 10 = 1
So 51209-53-1 is a valid CAS Registry Number.

51209-53-1Downstream Products

51209-53-1Relevant articles and documents

Nitrile imines and nitrile ylides: Rearrangements of benzonitrile N-methylimine and benzonitrile dimethylmethylide to azabutadienes, carbodiimides, and ketenimines. chemical activation in thermolysis of azirenes, tetrazoles, oxazolones, isoxazolones, and oxadiazolones

Begue, Didier,Dargelos, Alain,Berstermann, Hans M.,Netsch, Klaus P.,Bednarek, Pawel,Wentrup, Curt

, p. 1247 - 1253 (2014/03/21)

Flash vacuum thermolysis (FVT) of 1-methyl-5-phenyltetrazole (5b), 2-methyl-5-phenyltetrazole (1b), and 3-methyl-5-phenyl-1,3,4-oxadiazol-2(3H)-one (3b) affords the nitrile imine (2b), which rearranges in part to N-methyl-N′-phenylcarbodiimide (7b). Another part of 2b undergoes a 1,4-H shift to the diazabutadiene (13). 13 undergoes two chemically activated decompositions, to benzonitrile and CH2=NH and to styrene and N 2. FVT of 2,2-dimethyl-4-phenyl-oxazol-5(2H)-one (16) at 400 C yields 3-methyl-1-phenyl-2-azabutadiene (18) in high yield. In contrast, FVT of 3,3-dimethyl-2-phenyl-1-azirene (21) at 600 C or 4,4-dimethyl-3-phenyl- isoxazolone (20) at 600 C affords only a low yield of azabutadiene (18) due to chemically activated decomposition of 18 to styrene and acetonitrile. There are two reaction paths from azirene (21): one (path a) leading to nitrile ylide (17) and the major products styrene and acetonitrile and the other (path b) leading to the vinylnitrene (22) and ketenimine (23). The nitrile ylide PhC -=N+=C(CH3)2 (17) is implicated as the immediate precursor of azabutadiene (18). FVT of either 3-phenylisoxazol- 5(4H)one (25) or 2-phenylazirene (26) at 600 C affords N-phenylketenimine (28). The nitrile ylide PhC-=N+=CH2 (30) is postulated as a reversibly formed intermediate. N-Phenylketenimine (28) undergoes chemically activated free radical rearrangement to benzyl cyanide. The mechanistic interpretations are supported by calculations of the energies of key intermediates and transition states.

The 1,4-Hydrogen Shift in Nitrile Ylides

Berstermann, Hans-Michael,Netsch, Klaus-Peter,Wentrup, Curt

, p. 503 - 504 (2007/10/02)

2-Azabutadienes are formed in quantitative yield by flash vacuum pyrolysis of oxazol-5(2H)-ones, but partially decompose owing to chemical activation when generated from 2H-azirines.

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