Phenoxy ether

Friedel-Crafts cyclization of phenoxy ether 70 leads to the corresponding xanthone TJ Exhaustive oxidation of the methyl group leads to the carboxyl lie acid, xanoxate (72). ... 

A similar twisting was expected to occur with the phenoxy ether to explain the greater reactivity of the 2,6-isomer in recent studies of the reactions of 2,4-dinitro and 2,6-dinitrophenyl phenyl ethers with zz-butylamine109. Nevertheless, in this case, the authors... 

O-allylation, 10, 657 Phenoxides, with Zr(IV), 4, 784 Phenoxy-ethers, in ethylene polymerization, 4, 1095 Phenoxy-imines... 

Figure 40 Ethylene polymerization with phenoxy-ether-based catalysts.

From 1959 to date the number of ethers identihed in tobacco and tobacco smoke has increased over 30-fold to 992, 506 of which have been identihed in tobacco smoke, 659 in tobacco, and 173 in both tobacco and tobacco smoke. In his 1968 review, Stedman (3797) tabulated the presence of hve cyclic ethers in tobacco smoke, that is, furan, methylfuran, 2,5-dimethylfuran, tetrahydrofuran, and tet-rahydropyran. Currently, the identihed ethers with a furan nucleus exceed 275, those with a pyran nucleus exceed 225. The methoxy and ethoxy ethers number over 260, phenoxy ethers number 20. 

Figure 7.8 Variation of the o-Ps lifetime T3 and intensity as a function of temperature for an oligomeric m-phenoxy ether.

The structure of the enzymatically synthesized poly p-phenylphen(d) was analyzed by FT-IR and CP/MAS CNMR spectrometry [114]. The IR spectrum of the polymer indicates that the substitutions on the aromatic ring were at positions 1, 2, 4, and 6 with respect to phorolic-OH. Phenoxy ether linkage was not observed in the spectrum. In CP/MAS CNMR spectrum of the polymer, all the aromatic signds were broader than those of the monomer. The major NMR signal at 128 ppm shows that an oitfio-substituted product... 

---