TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): Zirconium complex of formula (5): Zr(R)2(L)(M)n, and tris(pentafluorophenyl) borane are reacted to obtain zirconium borane complex (I).M = monodentate ligand;n = 0 or 1; andL,R = same as defined above.Preferred Compound: The zirconium borane complex is of formula (Ia or Ib).R1,R10 = 3-4C alkyl, adamantyl or phenyl;R2,R3,R20 = hydrogen atom or 1-4C alkyl; andR4 = 1-2C alkyl.Preferred Method: Carbon dioxide and hydro silane are reacted in the presence of zirconium borane complex (I) to obtain siloxane, disiloxy methane or methane. Zirconium chloride of formula: ZrCl2(L)(M)n, and Grignard reagent of formula: R-MgX or lithium reagent of formula: R-Li are reacted to obtain zirconium complex (5).L,M,R,n = same as defined above; andX = halogen atom.Zirconium complex of formula: Zr(R)2(L) is obtained by reacting zirconium compound of formula: Zr(R)4 and bidentate or tridentate ligand.Preferred composition: The number of moles of zirconium complex (5) is more than number of moles of tris(pentafluorophenyl) borane. Preferred Definitions:    L = tridentate ligand of formula (1) or bidentate ligand of formula (2);    R1,R10 = 3-4C alkyl, adamantyl or phenyl;    R2,R3,R20 = hydrogen atom or 1-4C alkyl;    R4 = 1-2C alkyl; and    asterisk = radical.    EXAMPLE - Zirconium tetra benzyl complex (in g) (1.35) and toluene (60 mL) were added to flask after deaeration, and cooled. Toluene solution of bisphenol compound (1.41) was added and solvent was depressurizingly distilled off. The residue was washed, and zirconium dibenzyl complex (1.73) was obtained with yield of 78%. The zirconium dibenzyl complex and tris (pentafluorophenyl)borane (26 mg) were added to tube, and toluene (5 mL) was added. Solvent was distilled, and zirconium borane complex was obtained. Mixture of hexa ethyl disiloxane and bis (triethyl siloxy) methane was manufactured by reacting carbon dioxide and triethyl silane in presence of zirconium borane complex as catalyst.