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Author : Farhad Ghazi Mizori
Publisher :
ISBN 13 :
Total Pages : 404 pages
Book Rating : 4.:/5 (318 download)
Download or read book Transmetallation from Zirconium to Boron written by Farhad Ghazi Mizori and published by . This book was released on 2004 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ramona Quintanilla
Publisher :
ISBN 13 :
Total Pages : 328 pages
Book Rating : 4.:/5 (318 download)
Download or read book Migration of Organic Groups from Zirconium to Boron written by Ramona Quintanilla and published by . This book was released on 1995 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trialkoxyboranes and trialkoxyboroxins are synthesized by a novel and efficient route of esterifying boric acid with various alcohols in the presence of calcium hydride. Some of these boranes were used as precursors for transmetallation reactions. Trialkoxyboroxins can be obtained using a 1:1 molar ratio of boric acid to alcohol in the presence of calcium hydride. A special feature of trialkoxyboranes and trialkoxyboroxins is their ability to be interconverted by the addition of the appropriate amounts of boric acid or the hydroxyl compound in the presence of calcium hydride. Biscyclopentadienylzirconium-alkenyl-chlorides, Cp2Zr(alkenyl)Cl, are prepared from the hydrozirconation of terminal and internal alkynes. A systematic investigation of the transmetallation of these alkenyl groups from zirconium to a variety of boron compounds is presented. The reaction of the organozirconium with a boron chloride or bromide results in the exchange of the halogen and alkenyl group, forming structurally different types of alkenylboranes in good to high yields. A general method for preparing pure organohaloboranes (RBX2 and R2BX) was developed with high isolated yields and product purity. The reaction proceeds via the exchange of the anhydrides of boronic or borinic acids, (RBO)3 or R2BOBR2 with trihaloboranes (BX3). The newly formed organohaloboranes can contain hydroboratable (primary or secondary), non-hydroboratable (tertiary or aryl) and chiral groups. To demonstrate the utility of the facile migration from zirconium to boron, the syntheses of trans, trans-1,3-dienes and trisubstituted olefins are examined. Generally the olefin synthesis, via organoboranes, has been limited to coupling of alkylvinylboranes that contain symmetrical vinyl groups. The high regioselectivity of the hydrozirconation reaction with unsymmetrical internal alkynes overcomes this limitation. Thus, trisubstituted olefins containing three distinct organic groups about the double bond were readily synthesized using established organoborane chemistry. A number of preparations for zirconacycles have appeared in the literature. Since borocycles, ring structures containing a boron atom, are not easily prepared via normal hydroboration reactions, the use of metallacycles to prepare borocycle derivatives was investigated.
Author : Miles E. Tyrrell
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.3/5 (91 download)
Download or read book Metallic Binders for Zirconium Diboride written by Miles E. Tyrrell and published by . This book was released on 1963 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Joseph William Baumann
Publisher :
ISBN 13 :
Total Pages : 43 pages
Book Rating : 4.:/5 (18 download)
Download or read book Synthesis and Characterization of Boron and Zirconium Complexes written by Joseph William Baumann and published by . This book was released on 2018 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Treatment of tetrakis(dimethylamido)zirconium with four equivalents of primary and secondary amides in refluxing toluene, followed by sublimation of the crude products afforded tetrakis(N-tert-butylacetamido)zirconium, tetrakis(N-isopropylisobutyramido)zirconium, tetrakis(N-isopropylacetamido)-zirconium, tetrakis(N-methylacetamido)zirconium, and tetrakis(N-tert-butylformamido)zirconium as colorless crystalline solids. The structural assignments for the new complexes were based upon spectral and analytical data and by X-ray crystal structure determinations for tetrakis(N-tert-butylacetamido)zirconium, tetrakis(N-isopropylacetamido)zirconium, tetrakis(N-methylacetamido)zirconium, and tetrakis(N-tert-butylformamido)zirconium. These complexes are monomeric in the solid state, with eight-coordinate metal centers surrounded by four k2-amidate ligands. Solid state decomposition temperatures for the zirconium complexes range between 218-335 degrees Celsius. Treatment of tris(tert-butylperoxy)borane with one equivalent of 4-dimethylaminopyridine or ammonia, quantitatively yielded colorless crystalline complexes. The structural assignment for the 4-dimethylaminopyridine adduct was based upon spectral and X-ray crystal structure determinations. The thermal stability and volatility evaluation of bis[tris(pyrazolyl)borate]ruthenium(II) is reported as a potential precursor for the deposition of ruthenium containing films.
Author : Perry G. Cotter
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.3/5 (91 download)
Download or read book Preparing Zirconium Diboride Directly from Zircon written by Perry G. Cotter and published by . This book was released on 1961 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. R. Hayes
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (897 download)
Download or read book The Determination of Traces of Boron in Zirconium Metal and Zirconium Alloys written by M. R. Hayes and published by . This book was released on 1962 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : George Walter Kabalka
Publisher :
ISBN 13 :
Total Pages : 432 pages
Book Rating : 4.3/5 (91 download)
Download or read book Current Topics in the Chemistry of Boron written by George Walter Kabalka and published by . This book was released on 1994 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the proceedings of the 8th International Meeting on Boron Chemistry, held at the University of Tennessee, USA, in July 1993. The presentation covers all aspects of boron chemistry, including synthetic methods, molecular structure, bonding theory and applications.
Author : Stephan Rodewald
Publisher :
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.:/5 (224 download)
Download or read book The Migration of Alkyl Groups from Zirconium to Boron Compounds written by Stephan Rodewald and published by . This book was released on 1990 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 432 pages
Book Rating : 4.4/5 (179 download)
Download or read book Special Publication written by and published by . This book was released on 1980 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. F. Decker and J. W. Freeman
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.3/5 (91 download)
Download or read book THE MECHANISM OF BENEFICIAL EFFECTS OF BORON AND ZIRCONIUM ON CREEP-RUPTURE PROPERTIES OFA COMPLEX HEAT- RESISTANT ALLOY written by R. F. Decker and J. W. Freeman and published by . This book was released on 1957 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : raymond f. decker
Publisher :
ISBN 13 :
Total Pages : 82 pages
Book Rating : 4.3/5 (91 download)
Download or read book the mechanishm of beneficial effects of boron and zirconium on creep-rupture properties of complex heat resistant alloy written by raymond f. decker and published by . This book was released on 1957 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : H. G. King
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (113 download)
Download or read book Investigations of Analyses of Zirconium Hydride and Zirconium Oxide for Boron written by H. G. King and published by . This book was released on 1952 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because of the refractory nature of zirconium hydride and zirconium oxide, analysis of these materials for trace amounts of boron may be affected adversely by loss of boron or contamination from the container during decomposition. Both sources of error may be obviated by a direct spectrochemical analysis employing either copper fluoride or sodium carbonate as pyroelectric distillation carriers. Since both the hydride and oxide appear to behave similarly in the arc with these carriers, easily prepared zirconium oxide standards were useable for analysis of both materials. Acid or fusion decompositions of the two compounds to allow separation of boron as trimethyl borate were studied. Decomposition was successful with refluxing sulfuric acid, and partly successful with sodium carbonate melts. Loss of boron during conversion of zirconium hydride to the oxide was indicated during a study of the ignition conditions, and shown conclusively by spectrographic examination of the off-gases. Contamination of the sample material by boron from new platinum ware was also found. Agreement of spectrochemical and curcumin colorimetric determinations of boron zirconium hydride was fairly good, but both methods lacked precision. The low precision may be attributable to inhomogeneity of the sample material.
Download or read book Analytical Method for the Direct Absorptiometric Determination of Boron in Zirconium Metal and Its Alloys written by and published by . This book was released on 1963 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Carsten Bolm
Publisher : John Wiley & Sons
ISBN 13 : 3527318232
Total Pages : 483 pages
Book Rating : 4.5/5 (273 download)
Download or read book Activating Unreactive Substrates written by Carsten Bolm and published by John Wiley & Sons. This book was released on 2009-03-02 with total page 483 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of secondary interactions for the activation of non-reactive substrates constitutes a new and modern approach in catalysis. This first comprehensive treatment of this important research field covers the entire field and reveals the links between the various chemical disciplines. It thus adopts an interdisciplinary approach, making it of interest to the whole chemical community. A must for organic, inorganic, catalytic and complex chemists, as well as those working with/on organometallics.
Author : Louis S. Hegedus
Publisher : University Science Books
ISBN 13 : 9781891389047
Total Pages : 358 pages
Book Rating : 4.3/5 (89 download)
Download or read book Transition Metals in the Synthesis of Complex Organic Molecules written by Louis S. Hegedus and published by University Science Books. This book was released on 1999 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition offers easy access to the field of organotransition metal chemistry. The book covers the basics of transition metal chemistry, giving a practical introduction to organotransition reaction mechanisms.
Author :
Publisher :
ISBN 13 :
Total Pages : 1368 pages
Book Rating : 4.:/5 (318 download)
Download or read book Comprehensive Organometallic Chemistry II: Transition metal organometallics in organic synthesis written by and published by . This book was released on 1995 with total page 1368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Peter J. Harrington
Publisher : Wiley-Interscience
ISBN 13 :
Total Pages : 520 pages
Book Rating : 4.3/5 (91 download)
Download or read book Transition Metals in Total Synthesis written by Peter J. Harrington and published by Wiley-Interscience. This book was released on 1990-04-13 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examines the use of transition metal complexes as reagents for the synthesis of complex organic molecules. Presented here are total syntheses whose efficiency depends upon the unique reactivity patterns of organometallic complexes. For each total synthesis, the biological activity of the molecule is presented, followed by discussion of the principles of the organometallic processes involved.
