Single-sided identification

Identification of Locus of Adhesion Failure. To clarify whether the disruption is cohesive failure of the lacquer or interfacial failure between the substrate and lacquer, the lacquer and metal sides of the fracture surface were both measured by XPS. The results are shown in Fig. 4. For the purpose of comparison, UVC lacquer coated and DOS oiled nickel-plated sheets are shown in the top and bottom of the diagram, respectively. The contribution at ca. 286.5 eV of the lacquer surface is attributed to carbon singly bonded to oxygen... 

While frarcs-periplanar relationships are important to E2 elimination reactions, it is important to remember that, as illustrated in Schemes 6.6 and 6.7, E2 elimination reaction mechanisms do not have to occur in a concerted manner. After deprotonation, if the relevant orbitals do not line up, elimination will not occur until they do. Furthermore, recall that rotation around an acyclic single bond, as illustrated in Figures 6.4 and 6.5, occurs readily. Therefore, elimination reactions should not be removed from consideration if a molecule is drawn in a conformation that makes these reactions appear unfavorable. When looking at any type of nucleophilic reaction, initial identification of relevant trans-periplanar relationships will aid in the identification of potential side products and their respective mechanisms of formation. 

The rupture of carbon-carbon single bonds is demonstrated by the identification of methyl- and ethylguaiacol (12) and (14), respectively, and the corresponding alkylsyringols, (13) and (15). The methyl derivatives in all likelihood are formed by cleavage of the lignin side chain at the m position [Fig. 

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