Clarification of structure

NMR spectroscopy is probably the most important method for elucidating the structure and bonding of all compounds descried in this chapter. As these compounds are often liquids or can easily be dissolved in organic solvents, the electronic behavior of single molecules can be studied in rather short times. Solid-state NMR techniques play a much less important role. However, NMR spectroscopy not only enables clarification of structural details but can also be used to follow the progress of reactions during the synthesis of known or unknown compounds. Furthermore, the... 

In the context of this review, only the most significant theoretical contributions to the clarification of structures and properties of C molecules are discussed. The work since 1989 is stressed. Special emphasis is placed on the structures of cyclo[n]carbons for two reasons (i) there is still no consensus on the bonding in such species and (ii) these molecules seem to play an important role in the formation of fullerenes [222-224]. 

Modern developments in NMR measurements enable the efficient acquisition of data required for the unambiguous clarification of structural and rearrangement pathways for Rh-containing clusters. There is now quite a large structural data base available for comparative purposes but several significant advances can be expected over the next few years as a result of improved instrumentation and techniques. 

Investigations into the formation and biological significance of 1-amino-1-deoxyketoses have become an interesting and important area, following the clarification of structure and behavior of the products. Gottschalk published... 

The paper [661] was aimed at the development of a convenient method for the synthesis of a new group of sulfur-containing pyrroles by the addition of alkanethiols to N-vinylpyrroles as well as at clarification of structural orientation of this reaction. It is established that heating N-vinylpyrroles with alkanethiols both in the presence and absence of a radical initiator produces the p-adducts, N-(p-alkylthioethyl)pyr-roles (Scheme 2.198). 

---