1.3- Dimethoxy-5- benzen structure

CuC1 12S4-(o-dimethoxy-benzene)4 ] For structural formula of this complex please see Figure 3 2001JCD456... 

Diederich F, Jonas U, Gramlich V, Herrmann A, Ringsdorf H and Thilgen C 1993 Synthesis of a fullerene derivative of benzo[18]crown-6 by Diels-Alder reaction complexation ability, amphiphilic properties, and x-ray crystal structure of a dimethoxy-1,9-(methano[1, 2]benzomethano)fullerene[60] benzene clathrate Helv. Chim. Acta 76 2445-53... 

When 1,3-dimethoxybenzene is heated in benzene with la-acetyl-l-phthalamido-la,6b-dihydro-benzofuro[2,3-fo]az.irine as a source of phthalimidonitrene, 2,4-dimethoxy-7-phthalimido-3//-azepine is isolated in modest yield <95JCS(PI )809>. If the reaction is carried out over a shorter time period (5h instead of 18h), it is the 2//-azepine which is isolated in 18% yield. A number of other analogues have been prepared and the X-ray structure of 5,7-dimethoxy-3-methyl-2-phthalimido-27/-azepine has been determined. 

Well-defined catalysts with isolated mononuclear metal species have also been obtained from reactions of diethylaluminium compounds with calix[4]-arenediols. For instance, a catalyst such as (25,27-dimethoxy-p-t-butylcalix[4]-arene-26,28-diolato)aluminium chloride [(dmca)AlCl], characterised by a rigid structure of the AIO4 moiety like a distorted trigonal bypyramid, forms a monomeric species in a benzene solution at freezing temperature. It has been successfully applied for propylene oxide and cyclohexene oxide polymerisations, leading to bifunctional low molecular weight polyethers of relatively... 

From the results reported in the literature using low dielectric constant solvents such as dioxane (15), tetrahydrofuran and dimethoxy-ethane (16), or benzene (13, 14), the chemical makeup of the solvent, its molecular structure, or both, might well influence the final results. With the first three solvents the presence of oxygen atoms seems to be... 

Pd-catalyzed cross-coupling reactions were studied in one-pot multicatalytic processes to synthesize disubstituted alkenes and alkanes from carbonyl derivatives [68]. The use of Cu-catalyzed methylenation reactions was the key starting reaction to produce terminal alkenes that are not isolated but submitted to further structure elongation (hydroboration followed by Suzuki cross-coupling) (Figure 1.13). These processes have been used to synthesize methoxylated ( )-stilbenoids (i.e., ( )-1,3-dimethoxy-5-(4-methoxystyryl)benzene). 

Mortland, Pinnavaia and their co-workers have found that the adsorption of certain aromatic molecules on montmorillonites whose exchangeable cations are saturated with transition metal ions leads to the formation of colored complex(2-4). The IR spectrum of benzene complex formed under a dry atmosphere Indicates the chemical state of the adsorbed benzene is remarkably different from that of liquid benzene (2,3), while adsorbed anisole is reported to dimerize to 4,4 -dimethoxy-biphenyl(5). The essential step in the formation of these colored complexes has been shown to involve an electron transfer from the adsorbed organic molecules to the interlayer transition-metal ion, notably by ESR(4,6). However, the detailed spectroscopic information concerning the structure of adsorbed species have not been sufficient. 

Reynolds et al. [38] synthesized and characterized poly(di-2-thienylphenylene), poly(di-2-thienyl-2,5-di-methylphenylene) and poly(di-thienyl-2,5-dimethoxy-phenylene) to study the effect of substitution on polymer structure. These electrically conducting (ca. 1 S/cm) polymers show electrochemical and optical properties that are similar to those of PT. In addition, substitution on the benzene ring enables the synthesis and characterization of additional copolymers in the series [39]. 

---