Tetrabenzo structure

Pentaerythritol Tetrabenzoate, C33H2808, mw 552.55, OB to C02 -208.5% needles, mp 99—101° prepd by the action of Bz chloride on PE (Refs 1 2). A mixt of PETN with PE tetrabenzoate and a PE cinnamate (structure unspecified) has been patented as a progressive burning gun pro pint (Ref 3)... 

Fig. 5 Layer structure of (tetrabenzo [24] crown-8)(dibenzylammonium)(PF6) held together by weak C-H...F hydrogen bonding between the pseudorotaxane and PFg. Only N-H hydrogens shown [32]...

There is abundant information to support the contention that the lower-melting monoisopropylidene-mannitol (m. p. 85°) is the 3,4-derivative. For example, its tetrabenzoate is identical with that obtained by acetonation of 1,2,5,6-tetrabenzoyl-mannitol,11498 the structure of which is based on independent evidence.114 The larger fragment resulting from the oxidative scission of the D-enantiomorph of the isopropylidene-man-nitol with lead tetraacetate is 2,3-isopropylidene-D-//treo-dihydroxy-succinic dialdehyde, characterized by its subsequent conversion into D-i/ireo-tartaric acid.126 When methylated and hydrolyzed, the L-enantio-morph of the monoketal affords a tetramethyl-mannitol, which, in turn, yields dimethyl-L-glyceraldehyde with lead tetraacetate.127 Each of these facts is in itself proof that the acetone residue occupies the 3,4-position in the mannitol molecule. 

Mizuguchi, J. (1997). Structural and optical properties of 5,15-diaza-6,16-dihydroxy-tetrabenzo[b,e,k,n]perylene. Dyes and Pigments, 35, 347-60. [264]... 

The benzoates are more resistant to acid hydrolysis than are the corresponding acetates, but by boiling with hydrochloric acid in acetone the amine radical is removed, giving good yields of n-glucose 2,3,4,6-tetrabenzoate, D-mannose 2,3,4,6-tetrabenzoate, D-xylose 2,3,4-tribenzoate, and D-frue-tose 1,3,4,6-tetrabeiizoate, compounds of known structure, previously prepared and characterized. ... 

Tribenzocyclooctatetraene dianion 412 and tetrabenzocyclooctatetraene dianion 42z were prepared by potassium and lithium metal reduction of 41z and 42z respectively 130). The tetrabenzo derivative 42z is in fact a tetraphenylene dianion. This dianion shows a C2 symmetry and therefore deviates from the D2d symmetry of the tub shaped neutral 42131 The radical-anion 42 possesses D2d symmetry and is similar to the neutral compound. The deformation of 421 is a specific process of the (4n + 2)jr-electron dianion. Under nonequilibrium conditions the radical-anion possesses the same distorted structure as that of the dianion. These observations of Huber and Mullen enable the monitoring of structural and energetic effects of electron transfer reactions 131). 

Boese, R Matzger, A.J Volhardt, K.P.C. Synthesis, crystal structure, and explosive decomposition of 1,2 5,6 11,12 15,16-tetrabenzo-3,7,9,13,17,19-hexa-dehydro[20]annulene formation of onion- and tube-like closed-shell carbon particles. J. Am. Chem. Soc. 1997, 119, 2052-2053. 

In 1944, Hann and Hudson found that, when refluxed with cupric sulfate, osazones are converted into colorless triazole derivatives which they designated osotriazoles. They determined the structure of the d-orahmo-hexulose derivative by means of the following reactions (1) it gave a tetraacetate and a tetrabenzoate which could be saponified to the parent osotriazole, indicating the presence of four free hydroxyl groups therein (2) on periodate oxidation, 3 moles of oxidant were consumed per mole of (71), giving 1 mole of formaldehyde, 2 moles of formic acid, and a known compound, 4-formyl-2-phenyl-l, 2,3-triazole (72). 

A crystal structure determination for this compound showed that while the square planar coordination of palladium is retained, strain within the molecule is relieved by a folding of the ligand similar to that described above for salicylaldimine complexes. The P position of these ligands may be substituted by electrophilic reagents before or after complexation. Tetrabenzo-l,5,9,13-tetraazacyclohexadeca-l,5,9,13-tetraenepalladium didiloride (47) may be formed by template condensation of o-aminobenzaldehyde. ... 

This article reviews the history and synthesis of tetraphenylene (tetrabenzo[n, c, e, g] cyclooctatetraene), its ability to enclathrate a wide range of guest species, the structural characteristics of the resulting class of clathrate inclusion compounds, and synthetic approaches to the preparation of tetraphenylene derivatives which may serve as potential host systems. 

Fig. 21.2 The UV absorbance spectra of the spectra are not only different from each other, two isomers tetrabenzo[a,cd,//m]perylene and but are very different from those of the two tetrabenzo[fl,cd,j,/m]perylene. Note that these similar structures shown in Fig. 21.1.

Fig. 1 Space-filling diagram showing the binding of 1,2-dichloroethane to Cs within a molecular cleft from the crystal structure of [Cs(tetrabenzo-24-crown-8)(l,2-dichloroethane)2] (NOslTHiO). Minor disorder of the 1,2-dichloroethane was omitted. This diagram was adapted from Ref [6].

Phthalocyanine (PCH2) is structurally similar to porphyrin (PHj) (see Fig. 1). The four isoindoline units are linked together in the 1,3-position by aza bridges to form a cyclic system. Formally, phthalocyanines are tetrabenzo-tetraazaporphyrins. 

Scheme 52 Structural formula of the 1,4 8,11 15,18 22,25-tetraethano-29H,31H-tetrabenzo[h,, l, Iporphyrin (CP), tetrabenzoporphyrin (BP), and bis(dimethylphenylsilylmethyl) [60]fullerene (SIMEF). Reprinted with permission from Matsuo Y, Sato Y, Niinomi T, Soga I, Tanaka H, Nakamura E (2009) Columnar structure in bulk heterojunction in solution-processable three-layered p-i-n organic photovoltaic devices using tetrabenzoporphyrin precursor and silylmethyl[60]fullerene. J Am Chem Soc 131(44) 16048-16050. Copyright (2009) American Chemical Society...

---