Photochemically Induced Metathesis Reactions of Tetradehydrodianthracene: Synthesis and Structure of Bianthraquinodimethanes

Abstract

Presumably C12-C20 are 50:50 mixtures of diastereomers, as established for lower homologs C 4 -G . However. in each case only a single set of NMR signals is observed. Other spectroscopic properties. and redox behavior. are also presumed to be identical. We have not yet been able to obtain single crystals. perhaps in part due to the presence of two diastereomers.

Vibrational properties of four consecutive carbon picotubes

“…With a diameter of only 2.4Å, TDDA is the smallest possible picotube [5]. Our calculations on the TDDA molecule confirm the experimentally determined radius [5]. This highly strained molecule belongs to the dihedral group D 2h (see Fig.…”

“…[2]. With a diameter of only 2.4Å, TDDA is the smallest possible picotube [5]. Our calculations on the TDDA molecule confirm the experimentally determined radius [5].…”

“…Its structural similarity to a (4,4) carbon nanotube was shown to be reflected on the electronic and vibrational properties [2]. Next on the scene were the semitrimer, corresponding to a (3,3) armchair nanotube and Kammermeierphane, a substructure of a (5,5) nanotube [3,4]. Both compounds reveal strong analogies to the tetramer as well as to nanotubes, as will be discussed below.…”

“…Both compounds reveal strong analogies to the tetramer as well as to nanotubes, as will be discussed below. Another molecule, referred to as tetradehydrodianthracene (TDDA), represents a substructure of the smallest possible armchair tube, the (2,2) nanotube and thus completes the series of armchair-like picotubes [1,5].…”

A Modular and Size‐Selective Synthesis of [n]Cycloparaphenylenes: A Step toward the Selective Synthesis of [n,n] Single‐Walled Carbon Nanotubes

“…[1,2] Adding to their sheer aesthetic appeal and unique curved conjugation, CPPs represent the shortest sidewall segment of armchair carbon nanotube structures (Scheme 1). [1,3] After extensive trials by numerous chemists, [4] the groups led by Bertozzi, [5] Itami, [6,7] and Yamago [8] have finally accomplished the bottom-up organic synthesis of some [n]CPPs (n = 8, 9, 12, 18).…”