Metallacyclopentenes, synthesis

Metallacyclopentanes, 3,4-dimethylene-synthesis, 1, 669 Metallacyclopentan-2-ones synthesis, 1, 669 Metallacyclopentenes synthesis, 1, 670 Metallafluorenes synthesis, 1, 671 Metallaindanes synthesis, 1, 670 Metallaindenes synthesis, 1, 670, 671 Metallaxanthenes synthesis, 1, 671 Metalloporphyrins anions, 4, 398 demetallation, 4, 389... 

The presence of a cyclopropyl moiety in the carbene complexes makes them useful for synthesis. The cyclopropylcarbene complexes 95 undergo a cycloaddition reaction with alkynes to give the cyclopentenones 96 [51]. The reaction course is explained as being metallacyclopentene fragmentation. (Scheme 34)... 

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