In hydroxylic solvents, N-1-adamantyl-N-p-tolylcarbamoyl chloride undergoes a facile rate-determing ionization with very little assistance from nucleophilic solvation (very low sensitivity to changes in solvent nucleophilicity). In the relatively nucleophilic aqueous ethanol or aqueous acetone, the
Competing solvolysis-decomposition of 1-adamantyl chloroformate
โ Scribed by Dennis N. Kevill; Frederick L. Weitl
- Publisher
- Elsevier Science
- Year
- 1971
- Tongue
- French
- Weight
- 204 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0040-4039
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โฆ Synopsis
Recently. the preparation of I-pdprantyl chlorofoxmate was reported2 and the decaqosition of compouud to yield I-adamaatyl chl oride has been studied3. The kiuetic procedure was to bydrothe mmmcted chloroformate ester in aqueous acetone aud titrate against rthauolic sodim methoxide. The 1-adamantyl halide, produced in the decomposition, was inert mder these umditious.
We found that the acid present after hydrolysis was only proportional to, and not equivalent to, the concentration of uuxeacted chloroformate ester. It was apparent that, within the aqueoos acetone, decomposition was effectively cwting with solvolysis.
๐ SIMILAR VOLUMES
Product selectivities from solvolysis of l-adamantyl bromide in several binary protic solvents are revealing about the relative importance of solvent acidity and bulk (
## Abstract The rate constants for 3โsubstituted adamantyl __p__โtoluenesulfonates **3a**โ**3k** in ethanol/water 80:20 correlate well with the respective inductive substituent constants ฯ. The reaction constant ฯ for the toluenesulfonates **3** is 10% larger than for the corresponding bromides **2
As an Es value for the methanesulfonyloxy group was employed that of the ethoxy group.
Many examples of rearrangement which occur in straight-chain alkyl groups during kinetically controlled substitutions can be formally represented as proceeding via successive 1,2-shifts in intermediate carbonium ions.' -In certain cases, this mechanism has been