Cyclobutadiene irontricarbonyl

Other preparative methods make use of cyclobutadiene intermediates which react with acetylene compounds. The first method was reported by Criegee and his coworker 6) who prepared tetramethylcyclobutadiene from the 1,2-diiodo derivative (4). In the second method, the cyclobutadiene irontricarbonyl complex is oxidized by Ce,v to produce free cyclobutadiene (5) 7). This reaction is widely used for the synthesis of cyclobutadiene. 

Cyclobutadiene irontricarbonyl. Formal Fe charge 0. Number of jt electrons involved 4... 

The preparation of a stable irontricarbonyl complex of unsubstituted cyclobutadiene [9] provided the real opening for the study of cyclobutadiene since this complex is oxidised by the cerium(IV) cation to cyclobutadiene [10,11]. Although a highly reactive species it was trapped by dienophiles. Since then other methods have also been used to prepare cyclobutadiene, and, in addition to chemical trapping, it has been prepared and studied in matrices at low temperature. These results are discussed in more detail in the body of this chapter. 

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See also in sourсe #XX -- [ ]

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