Dihalocarbene complexes, synthesis complex

Roper and co-workers described the synthesis of the osmium carbyne complex 10 from the reaction of the dihalocarbene complex 9 with 2 equiv /7-tolyllithium [Eq. (16)] (56). 

Beck and co-workers achieved the synthesis of the -carbido complex 12 by reaction of the porphyrin iron dihalocarbene complex 11 with jjenta-... 

Although the reaction of dihalocarbenes with alkenes gives good yields of halogenated cyclopropanes, this is not usually the case with methylene, tCH2, the simplest carbene. Methylene is readily formed by heating diazomethane, CH2N2, which decomposes and loses N2, but the reaction of CH2 with alkenes often affords a complex mixture of products. Thus, this reaction cannot be reliably used for cyclopropane synthesis. 

Phase-Transfer Catalyzed Synthesis of Organometallic Compounds and Complexes. Some organometallic compounds and complexes are efficiently synthesized using PTC methodology. For example, phenyltrihalomethyl mercury compounds, important precursors of dihalocarbenes generated in nonba-sic conditions are readily prepared by treatment of a haloform solution of phenyl mercury chloride with aqueous NaOH saturated with KF, in the presence of TAA salt (eq. 182). 

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