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274690-02-7

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274690-02-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 274690-02-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,7,4,6,9 and 0 respectively; the second part has 2 digits, 0 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 274690-02:
(8*2)+(7*7)+(6*4)+(5*6)+(4*9)+(3*0)+(2*0)+(1*2)=157
157 % 10 = 7
So 274690-02-7 is a valid CAS Registry Number.

274690-02-7Relevant articles and documents

Carbon Participation in the Solvolysis of 6-exo-substituted 2-exo- and 2-endo-Norbornyl p-Toluenesulfonates. Norbornanes Part 5

Fischer, Walter,Grob, Cyril A.,Hanreich, Reinhard,Sprecher, Georg von,Waldner, Adrian

, p. 2298 - 2311 (2007/10/02)

The solvolysis rates and products of the 6-exo-substituted 2-exo- 1a-1u, and 2-endo-norbornyl p-toluenesulfonates 2a-2u, have been determined.In general, the rate constants for 1 and 2 (log k) correlate well with the inductive constants ?qI of the substituents at C(6); however, their sensitivity to ?qI is much larger in the 2-exo-series 1 than in the 2-endo-series 2.This differential transmission of polar effects is the cause of decreasing 2-exo/2-endo rate ratios from 2388 for R=t-C4H9 to 0.37 for R=Br, i.e., with increasing electron attraction by the substituent.The high sensitivity of the rate constants for the 2-exo-p-toluenesulfonates 1 to ?qI indicates an unusually strong inductive interaction between C(6) and the incipient cationic center at C(2).This interaction is ascribed to the participation of the pentacoordinate C(6)-atom, i.e. to 1,3-bridging, a consequence of steric hindrance of nucleophilic solvent participation in norbornanes.Donor substituents enhanche 1,3-bridging, lead to faster reactions and to the formation of 2-exo substitution products.Conversely, acceptor substituents reduce 1,3-bridging, decrease rates and facilitate the formation of 2-endo substitution products.Graded 1,3-bridging is discussed in the light of Winstein's nonclassical ion concept.

Die Synthese von 6exo-substituierten p-Toluolsulfonsaeure-estern

Fischer, Walter,Grob, Cyril A.,Sprecher, Georg von,Waldner, Adrian

, p. 816 - 823 (2007/10/02)

The preparation of hitherto unknown p-toluenesulfonates of 6exo-substituted 2endo-norbornanols is described.

13C NMR SPECTRA OF STEREOISOMERIC DERIVATIVES OF BICYCLOHEPT-5-ENE AND 3-OXATRICYCLO2,4>OCTANE

Shashkov, A. S.,Cherepanova, E. G.,Kas'yan, L. I.,Gnedenkov, L. Yu.,Bombushkar', M. F.

, p. 382 - 387 (2007/10/02)

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