Hexaethynylbenzene

Photophysical properties of [N]phenylenes

“…[21][22][23] As to the photophysical behaviour of the two [3]phenylenes, Niemeyer has revealed striking differences (in cyclohexane at room temperature): Whereas linear [3]phenylene (2a) was found to be non-fluorescent (Φ F < 10 -5 ), angular [3] 28 X-ray structure analysis data show also a strong alternance of the C-Cbond length in the central rings of the zig-zag [N]phenylenes. 5,29 In the present work, photophysical investigations of the linear and angular [3]phenylenes (2a), (3a), the zig-zag [4]-and [5]phenylenes (3b), (3c), and the triangular [4]phenylene (4) were performed (Fig. 1).…”

Photoinduced electron transfer in [N]phenylenes

“…Phenylenes (1) and (2) were synthesized and characterized according to the methods described in the literature [11,12]. For the synthesis of (3) and (4), an alkyne coupling protocol modified from that published was employed [13].…”

Synthesis and structure of new families of potential antitumor or antiviral agents. I. 4b,6a,10b,10c-Tetrahydrobenzo[3,4]cyclobuta[1,2-a]biphenylene-4b,6a-diyl diacetate

“…At first, taking into account the known structure of intercalating agents (Atwell, Bos, Baguely & Dennmy, 1988;, we thought that bent triphenylene derivatives would be good candidates. Following on from our previous work (Carr6, Gr6goire & Caub&e, 1984;Gr6goire, Carr6 & Caub&e, 1986;Carrb et al, 1988), we developed a new route to such derivatives (Dierks & Vollhardt, 1986;Nambu & Siegel, 1988;Shepherd, 1988) which is shown in the scheme below (THF = tetrahydrofuran, DHP = dihydropyran). This gave compound (5) which was found to be active in interfering with DNA replication.…”