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Inductivity and Bridging in 2-Bicyclo[2.2.2]octyl Cations. Polar Effects, Part 11

✍ Scribed by Cyril A. Grob; Pawel Sawlewicz


Publisher
John Wiley and Sons
Year
1984
Tongue
German
Weight
616 KB
Volume
67
Category
Article
ISSN
0018-019X

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✦ Synopsis


Inductivity was defined as thc reaction constant p, in the equation log (klk,) = pluq, where k and k, are fmt-order rate consmiits for the substitutcd and unsubstituted tosylates, respectively, in 80% EtOH and u? i s the corresponding inductive substituent constant [3]. For recent reviews, see [2]. X-ray data [&I] show that the C(2)-C(7) distance (2.40 A) in 2 is actually shorter than the C(2)-C(6) distancc (2.50 A) in 1.


πŸ“œ SIMILAR VOLUMES


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The pKa of 2-, 3-and 4-substituted quinuclidinium perchlorates and the solvolysis rates of the corresponding bicyclo[2.2.2loctyl-l-pnitrobenzenesulfonates reveal the dispersal of charge in ammonium ions and carbocations. Recent studies1 have shown that the solvolysis rates (log k) of several substi

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As derived from the Hammetr equation log k/ko = pI 'cr ? where k and ko are rate constants for substituted and unsubstituted tosylates, respectively, and u? are inductive substituent constants [2]. The p , values for C(1) in 3 and 4 are presented and discussed in this communication. The dotted lines

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Standard deviations of the pK,, upon which n? values are based, and of the conductometric rate measurements, as well uncertainties regarding the orientation of dipolar substituents, contribute to this limitation, as in most Hammett treatments. The I3C-NMR signals for the a-, /3-, and r-C-atoms in th

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✍ Cyril A. Grob; Pawel Sawlewicz πŸ“‚ Article πŸ“… 1984 πŸ› Elsevier Science 🌐 French βš– 199 KB

The effects of substituents at C5, C6 and C7 on the solvolysis rates of 2-norbornyl p-toluene sulfonates confirm that through space induction is directional and depends on distance and bridging strain.

Polar Effects in the Solvolysis of 4-Sub
✍ Cyril A. Grob; Roland Rich πŸ“‚ Article πŸ“… 1979 πŸ› John Wiley and Sons 🌐 German βš– 415 KB πŸ‘ 1 views

Hydrolysisofbicyclo[2.2.2]octylp-nitrobenzenesulfonate (14a,X =p-N02C6H4S03), and nineteen 4-R-substituted derivatives 14b-14 t in 70% aqueous dioxane yield the corresponding bicyclo [2.2.2]octanols 14 (X = OH), exclusively. The 7-center fragmentation to 1,4-dimethylidene-cyclohexane (15) is not obs

Polar effects. Part 12. Inductivity and
✍ Cyril A. Grob; Gerhard Wittwer; K. Rama Rao πŸ“‚ Article πŸ“… 1985 πŸ› John Wiley and Sons 🌐 German βš– 480 KB πŸ‘ 1 views

## Abstract The rate constants (log __k__) for the solvolysis of 4^e^‐substituted 2^e^‐ and 2^a^‐adamantyl __p__‐nitrobenzenesulfonates **14** and **15**, respectively, in 80% EtOH correlate linearly with the respective inductive substituent constants Οƒ. Therefore, relative rates are controlled by