Manxyl dication

Adamantanedimethylium dications 236 Bicyclo[3.3.3]undecane-l,5-diyl dication (manxyl dication) 238 A sulfur-stabilized carbodication 238... 

BICYCLO[3.3.3]UNDECANE-l,5-DIYL DICATION (MANXYL DICATION)... 

On the other hand, the bicyclo[3.3.3]undecane-l,5-diyl dication 172 (manxyl dication) was observed first by Olah et al.189 (the 13C NMR spectrum is shown in Figure 3.15) [Eq. (3.45)]. Until the generation of the 1,16-dodecahedryl dication... 

The above examples of the 2,5-norbornadiyl dication (12) and the 1,4-dialkyl-1,4-cyclohexyl dications (15 and 17) illustrate the importance of distance between charge centers implicating stability. Another interesting example of this effect is in the isomerization of the 1,5-manxyl dication (19, eq 11). 

In addition to the 1,5-manxyl dication (19), the l,4-bicyclo[2.2.2] octadiyl dication (25) has been claimed to have been observed (eq 13).llc... 

A comprehensive NMR spectroscopic study126, of a series of acyclic carbodications was carried out. Carbodications were also observed in more rigid systems, such as the apical, apical congressane dication 57103, bicyclo [2.2.2] octyl dication 65127 and bicyclo [3.3.3] nonyl dication <59106 (manxyl dication — Fig. 10). 

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