7  Aromatic chemistry

From Macrocyclic Oligo-acetylenes to Aromatic Ring Carbo-mers

“…A recent illustration has been provided by Iyoda et al in the radialenic series. 164 While [6]radialene and ring carbo kmers thereof (k ) 1, 2) have been experimentally studied (see section 3.3), the [9]radialene core has been theoretically considered but remains unknown, 165 just as do its ring carbo kmers. Recently however, ring 3-carbo 2 -mers of [6]-and [9]radialene (105, 106) have been described (Figure 52).…”

“…164 While [6]radialene and ring carbo kmers thereof (k ) 1, 2) have been experimentally studied (see section 3.3), the [9]radialene core has been theoretically considered but remains unknown, 165 just as do its ring carbo kmers. Recently however, ring 3-carbo 2 -mers of [6]-and [9]radialene (105, 106) have been described (Figure 52). 164 Their synthesis was performed by Eglinton-Glaser coupling of a diethynyl [3]dendralene precursor (105 was however obtained in trace quantity).…”

“…The combined cyclic acetylenic and oligo-acetylenic characters are however poorly restrictive for defining a reasonable nonredundant scope of review. Many recent reviews indeed dealt with macrocyclic acetylenic scaffolds with various nonacetylenic linking bricks, such as ethylene , and arylene units, allowing for possible extended aromaticity . As a third criterion, the scope might be restricted to carbo -meric molecules, where all non-C sp atoms are bound to C sp atoms only and all C sp atoms are bound to another one at least .…”

“…Many recent reviews indeed dealt with macrocyclic acetylenic scaffolds with various nonacetylenic linking bricks, such as ethylene 1,7 and arylene units, 8 allowing for possible extended aromaticity. 9 As a third criterion, the scope might be restricted to carbo-meric molecules, 10 where all non-C sp atoms are bound to C sp atoms only and all C sp atoms are bound to another one at least. To put it in a larger context however, a more general typology of cyclic oligo-acetylenes is first proposed.…”

Metal ion binding with dehydroannulenes — Plausible two-dimensional molecular sieves

“…7 Synthetic chemistry attempts towards dehydroannulenes macromolecules have been met with tremendous success in recent years. [8][9][10][11][12][13][14] The structural uniqueness of these class of molecules is likely to have several applications in the areas spanning catalytic, magnetic, optical switches, photochromic, nonlinear optical materials, liquid crystals, thin-film transistors, optical storage devices, 15 etc.…”