Synthesis of a [14]annuleno[18]annulene

Synthesis of a [18]annuleno[18]annulene

✍ Masanari Osuka; Yukihiro Yoshikawa; Shuzo Akiyama; Masazumi Nakagawa 📂 Article 📅 1977 🏛 Elsevier Science 🌐 French ⚖ 227 KB

Recently bicyclic systems consisting of two fused annulene rings (annulenoannulenes) have received considrable attention. We have reported the synthesis of tetra-t-butylhexakisdehydro[lZ.l2.4] [18]annuleno[l8]annulene (1) and tetrat-butyltrisdehydro[lO.lO.2][14]annuleno[l4]annulene (2) consisting of

Synthesis and properties of a trisdehydr

Synthesis and properties of a trisdehydro[18.10.2][14]annuleno[22]annulene

✍ Shin'ichi Nakatsuji; Shuzo Akiyama; Masazumi Nakagawa 📂 Article 📅 1978 🏛 Elsevier Science 🌐 French ⚖ 497 KB

The interesting NMR spectral behavior of trisdehydro[4n+2]annuleno[4n1+2]annulenes (I,: n=n'=3 (1); Ib: n=n'=4 (2) and Ic: n=3, n'=4 (3)) inspired us to prepare a higher analogue of this series of annulenoannulenes, the trisdehydro-[18.10.2][14]annuleno[22]annulene (Id: n=3, n'=5) in order to get fu

Tetrakisdehydro[16]annuleno[18]annulene

✍ Koichi Sakano; Tsutomu Nakagawa; Masahiko Iyoda; Masazumi Nakagawa 📂 Article 📅 1981 🏛 Elsevier Science 🌐 French ⚖ 230 KB

Sununary: Tetrakisdehydro[16]annuleno[l8]annulene consisting of trisdehydro[16]annulene and dehydro[18]annulene has been synthesized. Induction of para-and diamagnetic ring currents 16-and 18-membered rings, respectively, was clearly recognized by the H NMR spectroscopy. marked suppresion of the dia

Tetrakisdehydro[18]annuleno[20]annulene

✍ Yukihiro Yoshikawa; Masahiko Iyoda; Masazumi Nakagawa 📂 Article 📅 1981 🏛 Elsevier Science 🌐 French ⚖ 417 KB

Tetrakisdehydro[14]annuleno[20]annulene

✍ Yukihiro Yoshikawa; Masahiko Iyoda; Masazumi Nakagawa 📂 Article 📅 1981 🏛 Elsevier Science 🌐 French ⚖ 225 KB

Tetrakisdehydro[14]annuleno[20]annulene consisting of an aromatic bisdehydro[14]annulene and an antiaromatic trisdehydro[20]annulene has been synthesized. The 'H NMR spectra clearly indicate the induction of para-and diamagnetic ring currents in each of the [4n]-and [4n+2]rings, respectively. Recent

Tetrakisdehydro[14]annuleno[16]annulene

✍ Masahiko Iyoda; Shuzo Akiyama; Masazumi Nakagawa 📂 Article 📅 1979 🏛 Elsevier Science 🌐 French ⚖ 263 KB