Ziegler Aufbaureaktion

Companies using the Ziegler Aufbaureaktion, the SHOP technology, or the a-SABLIN process for the production of 1-alkenes get into trouble if the market for one specific 1-alkene grows very much faster than the market for all other chain lengths (Wass, 2007). Therefore, it is of obvious interest to develop alternative catalyst systems for the selective synthesis of a specific 1-aIkene from ethylene. 

The first biphasic process which has been commercialized uses Ziegler s Aufbaureaktion ("growing reaction") of ethene yielding oligomeric alkenes (Equation 5.7, [65]). 

Technische Bedeutung erlangte diese Aufbaureaktion" aus Athylen mit Aluminiumtrialkylen durch Arbeiten von K. Ziegler et al. 5>. 

In 1953, Ziegler and Holzkamp (7) observed that the Aufbaureaktion (2) of triethylaluminum and ethylene [Eq. (1)] changed to a dimerization of ethylene to butene in the presence of traces of nickel salts [Eq. (2)]. This fundamental discovery, which has become known as the nickel effect, led to the development of Ziegler catalysts (3) and was the starting point for the organonickel chemistry of Wilke et al. (4, 5). 

K. Ziegler, a German chemist, observed an Aufbaureaktion (growth reaction) when ethylene is polymerized in the presence of triethylaluminum [1,18] (see Eq. 2.24). 

Figure 3 Ziegler s Aufbaureaktion produces alcohols and alumina.

---