Dicarbon molecule

Reactions of Carbon Atoms, Dicarbon Molecules, and Tricarbon Molecules... 

FIGURE 11.12 Products formed in the reactions of ground (left) and excited state dicarbon molecules (right) with unsaturated hydrocarbon molecules under single collision conditions. 

If one molecule of a dibasic ester is used, a ketone dicarbonic add ester will be formed, eg. ... 

FONs can occur most often for paramagnetic molecules. Ground-state examples are rare. Examples include dicarbon and the corresponding excited state of disilicon (Dunlap and Mei, 1983). However, lower-energy Xa-like... 

Ceo is a highly electrophilic molecule and numerous addition reactions of nucleophiles and electrons (to give Cg, n = 1-6) are known. Another surprise was therefore the recent report of the protonated [HCeo]. To stabilize this unusual acid, the exceptionally inert [CBnHeXg]" carborane anion was used (X = Cl and Br). (Have we become so jaded not to consider the anion exotic because its framework interpolates the superaromatic icosahe-dral [Bi2Hi2] and its dicarbon isoelectronic relatives, the isomeric 0-, m-, and p-carboranes, B10C2H12, and their numerous and diversely substituted derivatives )... 

We shall only consider here polycondensation of bifunctional molecules, that essentially form straight polymer chains. Well known examples of polymers made by this type of polycondensations are polyamides, polyesters and polyurethanes. Tliere are usually two different monomers, that are each bifunctional (e.g., a dicarbonic acid and a diamine). The end group of the one reacts with the end group of the other (e.g., forming an amide). There is only one essential process propagation. TTie first propagation step can be indicated schematically in the following way... 

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