Structure of model compound

Figure 4. Structures of model compounds which upon covalent binding to DNA give predominantly site I adducts.

Fig. 9. Structures of model compounds with definitive stereochemistry...

Scheme 2. Structures of model compounds used for the component units of macrocyclic ligand 1 and of its Ru and Os complexes.

FIGURE 15. Structure of model compounds 17—20. The environment about the metal... 

Table 2.1 Experimental data from X-ray crystallographic analysis and theoretical optimized structures of model compounds A and B...

As shown in Table 7.4.1, 4-O-isopropylconiferyl aldehyde (18) and 2-(2-methoxyphenoxy)-l-(3,4-dimethoxyphenyl)-3-hydroxy-l-propanone (20) have Aer maxima at 342 and 310 nm with corresponding Aer values of 19800 and 9400 mol 1 cm-1, respectively, at the reduction time of 100 min (see Table 7.4.1 for Aer values and Fig. 7.4.2 for structures of model compounds). In addition, compound (18) has a Aer value of 2020tmol em 1 at 310nm, while compound (20) has a Aer value of 10500 mol-1 cm 1 at 342nm (Adler and Marton 1959). Thus, the quantities of etherified coniferyl aldehyde-type (2) and etherified l-(guaiacyl)-l-propanone-type (JT) structures in lignin can be estimated by simultaneously solving Eqs. (9) and (10) ... 

Rh + ions. Since the substituted ions have almost the same ionic radii and the same charge as Fe +, their complexes show a high degree of structural similarity with the corresponding Fe + complexes, as demonstrated by the crystal structures of model compounds. The d-electron configurations of Cr + and Rh + grant significant CFSE for kinetic inertness and provide well-characterized d-d transitions with distinct UV/vis and CD spectra. 

These structures, which have been formulated by assuming that one of the unshared electron pairs on O2 forms the initial bond to the metal, are expected to lead to an angular geometry which has been observed in X-ray structures of model compounds, in oxy-myoglobin (Fig. 16-10), hi82 oxyhemoglobin. ... 

To interprete these X-ray spacings, let us first examine the structure of model compounds PMAA-n and PMMAA-n. The macromolecules of these polymers have a chemical structure similar to that of Pc5iMAA-n with the difference that they do not contain cholesterol groups in the side chains. 

C. Tanaka and J. Tanaka, Molecular and electronic structure of model compounds of doped polyacetylene, Bull. Chem. Soc. Jpn. 66 357 (1993). 

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