Tetrakisdehydro[18]annuleno[20]annulene

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[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

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 of a [14]annuleno[18]annulene

✍ Shin'ichi Nakatsuji; Shuzo Akiyama; Masazumi Nakagawa 📂 Article 📅 1977 🏛 Elsevier Science 🌐 French ⚖ 238 KB

Trisdehydro[14]annuleno[16]annulene

✍ Yukihiro Yoshikawa; Masahiko Iyoda; Masazurni Nakagawa; Shin'ichi Nakatsuji; Shu 📂 Article 📅 1981 🏛 Elsevier Science 🌐 French ⚖ 233 KB

All new compounds described in this paper gave IR, NMR, and mass spectral data consistent with the assigned structures and satisfactory elemental analyses were obtained.