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Title: The Reaction of Bromoacetyl Bromide with Selected Organometallic Compounds
???metadata.dc.contributor.*???: Dr. Makonnen Dilgassa
Tafesse, Fikru
Issue Date: Jun-1980
Publisher: Addis Ababa University
Abstract: Organometallic compounds are widely used as heterogenous and homogenous catalysts in the industrial productions of important chemicals and synthetic products. In many cases of such industrial transformation, metal carbenes are thought to play important roles as the active catalytic ingredients that bring about the transformation. Such carbenes are classified into two groups electrophilic and nucleophilic. Although several nucleophilic carbenes have been prepared, no general synthetic methods have been developed for the generation of electrophilic metal carbenes. We believe that oe-monohaloalkyltransition metal derivatives can be used as precursors of electrophilic metal carbenes via their interaction with lewis acids(see equation below). Por example, the interactions of a-monolialcalkyltransition metal derivatives with Lewis acids may produce metal carbenes capable of catalyzing the olefin metathesis reactions. LnMCR2Cl + A1C15-> fLnMCCRg)]A1C14 R = alkyl, H, aryl; In = Ligand. Consequently, our main goal is to synthesize a-monohaloalkyltransition metal derivatives by thermal or photochemical decompositions of the haloacetyl metal derivatives. BrCH2COM(00) with traces of brc0ch2m(cco^c^H^(m=m0,v)were made I ngood yields by allowing NaM(CO)5C5H^(M = Mo , W) to react with BrCH2G0Br. NaM(CO)5C5H^(M = Mo,W) to react with BrCH2G0Br. The thermal decompositions of BrCH2C0M(C0)^Cch^(m=m0,w) were shown to involve p-halogen elimination. Decarbonylation followed by further decomposition produced the metal halides, g^h^M(co)^br(m=mo,w) The photochemical decompositions of BrCH2C0M(C03c5h5 (m=mo,w)give the metal halides, [C^H^M(CO)JBr (M=MO,W). Also Trace amlounts of BrCh2m(co)3C5H5(m=mo,w).were obtained. Nas’e(co)2CR2H^ reacted with Brch2cobr giving Br(BrCH2C0)(Ph^P)2Pt and trace quantity of Br(BrC0CH2)(Ph^P)2Pt. The thermal and photochemical decomposition of Br(BrCH2C0)(Ph^P)2Pt resulted in the production of (Ph^P)2Pt Br2
Description: A dissertation submitted to the School of Graduate Studies Addis Ababa University In Partial Fulfillment of the Requirements for the Decree Master of Science in Chemistry
Appears in Collections:Thesis - Chemistry

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