Synthesis and structures of organometallic derivatives of 1,2,3,4,5,6,7,8-octamethyl-1,5-dihydro-s-indacene

From polysubstituted 1,5-dihydro-s-indacene lithium derivatives to polysubstituted hydro-s-indacenyl radicals by a new method involving a single electron transfer from an electron rich olefin

“…Polyalkyl-s-indacenes have been synthesized and studied for the last fifty years for their use as ligands or spacers in the synthesis of binuclear complexes, in conducting polymers or biological compounds [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. However, literature reports only some examples of s-indacenyl and substituted s-indacenyl radical ions [16,19] and to the best of our knowledge no examples of substituted s-indacenyl radicals.…”

Molecular conformations and π-hydrogen bonds in anti- and syn-binuclear Rh(I) complexes of as-indacene-diide: a computational study

“…Recently, some of us synthesised monometallic rhodium derivatives of s-and as-hydroindacenide and bimetallic rhodium complexes of s-and as-indacene-diide [2][3][4][5][6]. Other research groups studied homo-binuclear complexes of Fe, Co, Ni, Mn, with the same aromatic 14-p-electron spacers [7][8][9][10][11][12][13], which have been identified as suitable bridging ligands in view of strong electronic interactions between the two coordinated metal centres. Moreover their structure assures a control of the distance and orientation between the metals which may be arranged in a syn or anti configuration with respect to the rigid bridge plane.…”

Novel and Convenient Synthesis of 2,7-Dialkyl-1,8-dihydro-as-indacenes­

“…32,33 However, the development of this fused polycyclic bridging ligand chemistry has been rather slow, apart from the nonsubstituted dihydro-s-indacene 34 and the stable 1,3,5,7-tetra-tert-butyl-s-indacene. 35 The synthesis of alkylsubstituted dihydro-s-indacenes has been limited to 1,2,3,4,5,6,7,8-octamethyl-1,5-dihydro-s-indacene 36 and 1,7-dihydro-2,6-dimethyl-s-indacene obtained as a minor product in the preparation of 1,6-dihydro-2,7-dimethyl-asindacene. 37 The synthesis of as-indacene was previously reported, long ago, by Hafner, 34 Katz, 38 Erden, 39 and Bell, 37 but these syntheses are relatively tedious or lead to the formation of a mixture of the sand as-indacene isomers.…”