Fluorescent hexaaryl- and hexa-heteroaryl[3]radialenes: Synthesis, structures, and properties

• Antonio Avellaneda,
• Courtney A. Hollis,
• Xin He and
• Christopher J. Sumby

Beilstein J. Org. Chem. 2012, 8, 71–80, doi:10.3762/bjoc.8.7

• limited extent [18][19][20][21]. Three coordination modes were observed for hexa(2-pyridyl)[3]radialene with Ag(I): A discrete M6L2 cage, a 1-D coordination polymer composed of M3L2 cages bridged by linear silver atoms, and a second 1-D coordination polymer where the radialene ligand acts as a

Effects of anion complexation on the photoreactivity of bisureido- and bisthioureido-substituted dibenzobarrelene derivatives

• Heiko Ihmels and
• Jia Luo

Beilstein J. Org. Chem. 2011, 7, 278–289, doi:10.3762/bjoc.7.37

• also been carried out with very good stereoselectivities in organized or constrained media [8][9][10]. For example, photoactive substrates may be accommodated as guest molecules in chiral host systems, such as suitably modified cucurbiturils [11][12][13][14][15], self-assembled cages [16] and bowls [17

Reciprocal polyhedra and the Euler relationship: cage hydrocarbons, C_nH_n and closo-boranes [B_xH_x]²⁻

• Michael J. McGlinchey and
• Henning Hopf

Beilstein J. Org. Chem. 2011, 7, 222–233, doi:10.3762/bjoc.7.30

• , [B6H6]2− has 7 skeletal electron pairs and is three-dimensionally aromatic. In contrast, in the CnHn cages the number of skeletal electron pairs equals the number of edges. In terms of the Euler equation (V + F = E + 2), for cage hydrocarbons, 2E = 3V, as exemplified by cubane, C8H8, which has 12 edges

• , or their corresponding anions [BxHx]2−, where x = 5 through 12, suggests that their complementary hydrocarbon cages CnHn, where n represents the even numbers 4 through 20, should also all be viable, as discussed herein. Synthetic routes to highly symmetrical polycyclic hydrocarbons As already noted