Hexyl ions structures

Deuterium label distributions in the deamination of exo- and e c/o-tricyclo[3.3.0.0 ] octyl-6-amine (7.122 and 7.123, respectively) were determined in a joint investigation of Bentley and Kirmse (Bentley et al., 1988). The results indicate that the bicyclo-hexyl-type bridged ion structure 7.124 and the open structure 7.125 are approximately equivalent with respect to energy level, but that the norbornyl-type ion 7.126 is not involved in the deamination, a result that is in accord with MM2 force field calculations (Scheme 7-37). 

For 2,3- and 1,2-dimethylnorbomyl ions the values of A5 are 287 and 274 ppm, respectively, lower than for classical 1,2-dimethylcyclopentyl and 1,2-dimethylcyclo-hexyl ions ( 350 ppm) being in a rapid degenerate equilibrium. These facts agree with the stmcture earlier ascribed by Olah to the l,2-dimethyl-2-norbomyl ion — a structure of partially c-delocalized, rapidly equilibrated ions (Wagner-Meerwein rearrangement) The same applies to Saunders s data on the 1,2-dimethylnor-bornyl cation in which one CHj is replaced by CDj (see below)... 

Neutral. A bis(ethylenediamine) structure has been incorporated into the surfactant molecule -Ci6H33C(H)[CON(H)(CH2)2NH2]2 in older to incorporate metal ions in an LB film structure via coordination instead of ionic complexation as occurs for anionic/cationic amphiphiles (14). Also, films of n-octadecylacetoacetate containing Cu2+ have been prepared, and exposure to H2S has resulted in the formation of a copper sulfide (39). Ditetradecyl-A-[4- [6-(A, N, W -trimethyl-ethylenediamino)-hexyl]oxy]benzoyl]-L-glutamate (DTG), which also contains the ethylenediamine unit, was used to make self-assembled films containing Cd2+ (40). 

Polypyrrole was the first conducting polymer used as ion-to-electron transducer in solid-state ISEs [43], and is still one of the most frequently used [45-68]. Other conducting polymers that have been applied as ion-to-electron transducers in solid-state ISEs include poly(l-hexyl-3,4-dimethylpyrrole) [69,70], poly(3-octylthiophene) [44,70-74], poly(3,4-ethylenedioxythiophene) [75-86], poly(3-methylthiophene) [87], polyaniline [44,67,73,88-99], polyindole [100,101], poly(a-naphthylamine) [102], poly(o-anisidine) [67] and poly(o-aminophenol) [103], The monomer structures are shown in Fig. 4.1. 

The trishomocyclopropenium ion (CeH/, 199) was first proposed by Winstein and coworkers as an intermediate in the solvolysis of czs-bicyclo[3.1.0] hexyl tosylate and extensive efforts were directed toward its generation under stable ion conditions. The persistent cation 199 was first prepared by Masamune et al. by the ionization of czx-bicyclo[3.1.0]hexane in superacid media and it has since been generated from the corresponding alcohol [Eq. (5.29)]. The NMR spectra of structure 199 are consistent with an ion of Csv symmetry. The three equivalent C-H groups are found at high field in the C NMR spectrum (8 C 4.9,7c h = 195.4Hz) in accordance with their hypercoordinate environments. 

Acid activated composite membranes were experimentally prepared in the same way than the experimental PAO polyamide/polysulfone composite membrane. Different concentrations of di-(2-ethyl hexyl)dithiophosphoric acid (DTPA) were added to interfacial-polymerization monomer solutions. Molecular structure of this organic acid is shown in Scheme 4. This activating agent is expected to be the carrier for heavy metallic ions, such as thallium, cadmium, zinc or uranium, between the media at both membrane sides [8-9, 63-65]. In this chapter, two activated membranes are studied DT50 and DT200 fabricated from 50 and 200 mM acid solutions, respectively. 

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