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Group 4 Metalloporphyrin Alkoxido Amido Hydrazido And Imido Complexes
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Book Synopsis Group 4 Metalloporphyrin Alkoxido, Amido, Hydrazido, and Imido Complexes by : Joseph Lyndon Thorman
Download or read book Group 4 Metalloporphyrin Alkoxido, Amido, Hydrazido, and Imido Complexes written by Joseph Lyndon Thorman and published by . This book was released on 1999 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: These imido compounds were key starting materials for the production and investigation of a number of complexes containing M-0 bonds. The zirconium and hafnium imido complexes, (TTP)M=NAr[Sperscript Pr], couple two pinacolone molecules with concomitant loss of the amine H2NAr[Superscript Pr]. The hydrazido, (TTP)Ti=NNR2 (R = Me, Ph), and imido, (TTP)Ti=NPr, derivatives of titanium undergo novel nitrene group metathesis reactions with p-chlorobenzaldehyde and with nitrosobenzene, respectively. Additional examples of atom and group transfer involving titanium(II) metalloporphyrins have been demonstrated. Utilization of a variety of donor molecules has facilitated the estimation of the double bond strength for complexes of the type (TTP)Ti=G (G = 0, S, Se, NR). This dissertation focuses on the synthesis and reactivity of group 4 metalloporphyrin complexes containing hard [Pi]-donor ligands and on the properties of titanium(II) metalloporphyrin species.
Book Synopsis Group 4 Metalloporphyrin Diolato Complexes and Catalytic Application of Metalloporphyrins and Related Transition Metal Complexes by :
Download or read book Group 4 Metalloporphyrin Diolato Complexes and Catalytic Application of Metalloporphyrins and Related Transition Metal Complexes written by and published by . This book was released on 2003 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, the first examples of group 4 metalloporphyrin 1,2-diolato complexes were synthesized through a number of strategies. In general, treatment of imido metalloporphyrin complexes, (TTP)M=NR, (M = Ti, Zr, Hf), with vicinal diols led to the formation of a series of diolato complexes. Alternatively, the chelating pinacolate complexes could be prepared by metathesis of (TTP)MCl2 (M = Ti, Hf) with disodium pinacolate. These complexes were found to undergo C-C cleavage reactions to produce organic carbonyl compounds. For titanium porphyrins, treatment of a titanium(II) alkyne adduct, (TTP)Ti(?2-PhC≡CPh), with aromatic aldehydes or aryl ketones resulted in reductive coupling of the carbonyl groups to produce the corresponding diolato complexes. Aliphatic aldehydes or ketones were not reactive towards (TTP)Ti(?2-PhC≡CPh). However, these carbonyl compounds could be incorporated into a diolato complex on reaction with a reactive precursor, (TTP)Ti[O(Ph)2C(Ph)2O] to provide unsymmetrical diolato complexes via cross coupling reactions. In addition, an enediolato complex (TTP)Ti(OCPhCPhO) was obtained from the reaction of (TTP)Ti(?2-PhC≡CPh) with benzoin. Titanium porphyrin diolato complexes were found to be intermediates in the (TTP)Ti=O-catalyzed cleavage reactions of vicinal diols, in which atmospheric oxygen was the oxidant. Furthermore, (TTP)Ti=O was capable of catalyzing the oxidation of benzyl alcohol and ?-hydroxy ketones to benzaldehyde and ?-diketones, respectively. Other high valent metalloporphyrin complexes also can catalyze the oxidative diol cleavage and the benzyl alcohol oxidation reactions with dioxygen. A comparison of Ti(IV) and Sn(IV) porphyrin chemistry was undertaken. While chelated diolato complexes were invariably obtained for titanium porphyrins on treatment with 1,2-diols, the reaction of vicinal diols with tin porphyrins gave a number of products, including mono-, bis-alkoxo, and chelating diolato complexes, depending on the identity of diols and the stoichiometry employed. It was also found that tin porphyrin complexes promoted the oxidative cleavage of vicinal diols and the oxidation of ?-ketols to ?-diketones with dioxygen. In extending the chemistry of metalloporphyrins and analogous complexes, a series of chiral tetraaza macrocyclic ligands and metal complexes were designed and synthesized. Examination of iron(II) complexes showed that they were efficient catalysts for the cyclopropanation of styrene by diazo reagents. Good yields and high diastereoselectivity were obtained with modest enantioselectivity. A rationalization of the stereoselectivity was presented on the basis of structural factors in a carbene intermediate.
Book Synopsis Group 4 Metalloporphyrin Diolato Complexes and Catalytic Application of Metalloporphyrins and Related Transition Metal Complexes by : Guodong Du
Download or read book Group 4 Metalloporphyrin Diolato Complexes and Catalytic Application of Metalloporphyrins and Related Transition Metal Complexes written by Guodong Du and published by . This book was released on 2003 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, the first example of group 4 metalloporphyrin 1,2-diolato complexes were synthesized through a number of strategies. In general, treatment of imido metalloporphyrin complexes, (TTP)M=NR, (M = Ti, Zr, Hf), with vicinal diols led to the formation of a series of diolato complexes. Alternatively, the chelating pinacolate complexes could be prepared by metathesis of (TTP)MCl2 (M = Ti, Hf) with disodium pinacolate. These complexes were found to undergo C-C cleavage reactions to produce organic carbonyl compounds. For titanium porphyrins, treatment of a titanium(II) alkyne adduct, (TTP)Ti([eta]2-PhC[Identical with]CPh), with aromatic aldehydes or aryl ketones resulted in reductive coupling of the carbonyl groups to produce the corresponding diolato complexes. Unreactive aliphatic aldehydes or ketones could be incorporated into a diolato complex on reaction with a reactive precursor, (TTP)Ti[O(Ph)2C(Ph)2O] to provide unsymmetrical diolato complexes. In addition, an enediolato complex (TTP)Ti(OCPhCPhO) was obtained from the reaction of (TTP)Ti([eta]2-PhC[Identical with]CPh) with benzoin. Titanium porphyrin diolato complexes were found to be intermediates in the (TTP)Ti=O-catalyzed cleavage reactions of vicinal diols, in which atmospheric oxygen was the oxidant. Furthermore, (TTP)Ti=O was capable of catalyzing the oxidation of benzyl alcohol and [alpha]-hydroxy ketones to benzaldehyde and [alpha]-diketones, respectively. Other high valent metalloporphyrin complexes also can catalyze the oxidative diol cleavage and the benzyl alcohol oxidation reactions with dioxygen. A comparison of Ti(IV) and Sn(IV) porphyrin chemistry was undertaken. While chelated diolato complexes were invariably obtained for titanium porphyrins on treatment with 1,2-diols, the reaction of vicinal diols with tin porphyrins gave a number of products, including mono-, bis-alkoxo, and chelating diolato complexes, depending on the identity of diols and the stoichimometry employed. Tin porphyrin complexes also promoted the oxidative cleavage of vicinal diols and the oxidation of [alpha]-ketols to [alpha]-diketones with dioxygen. In extending the chemistry of metalloporphyrins and analogous complexes, a series of chiral tetraaza macrocyclic ligands and metal complexes were synthesized. Examination of iron(II) complexes showed that they efficiently catalyzed the cyclopropanation of styrene by diazo reagents. Good yields and high diastereoselectivity were obtained with modest enantioselectivity. A rationalization of the stereoselectivity was presented on the basis of structural factors in a carbene intermediate.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2000 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Chemical Physics and Quantum Chemistry by :
Download or read book Chemical Physics and Quantum Chemistry written by and published by Academic Press. This book was released on 2020-09-18 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Quantum Chemistry presents surveys of current topics in this rapidly developing field one that has emerged at the cross section of the historically established areas of mathematics, physics, chemistry, and biology. It features detailed reviews written by leading international researchers. In this volume the readers are presented with an exciting combination of themes. Presents surveys of current topics in this rapidly-developing field that has emerged at the cross section of the historically established areas of mathematics, physics, chemistry and biology Features detailed reviews written by leading international researchers Topics include: New advances in Quantum Chemical Physics; Original theory and a contemporary overview of the field of Theoretical Chemical Physics; State-of-the-Art calculations in Theoretical Chemistry
Book Synopsis Modern Quantum Chemistry by : Declan Hicks
Download or read book Modern Quantum Chemistry written by Declan Hicks and published by . This book was released on 2020-09-15 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: The branch of chemistry which focuses on the application of quantum mechanics in physical models is referred to as quantum chemistry. It deals with the study of ground state of individual molecules and atoms as well as the transition and excited states that occur during chemical reactions. The two major branches of quantum chemistry are experimental quantum chemistry and theoretical quantum chemistry. Experimental quantum chemistry seeks to obtain information regarding the quantization of energy on a molecular scale. It relies extensively on spectroscopy. Nuclear magnetic resonance spectroscopy, infrared spectroscopy and scanning probe microscopy are a few of the common methods used in this area. The predictions of quantum theory are calculated within the field of theoretical quantum chemistry. This book aims to shed light on some of the unexplored aspects of quantum chemistry. While understanding the long-term perspectives of the topics, it makes an effort in highlighting their impact as a modern tool for the growth of the discipline. Those in search of information to further their knowledge will be greatly assisted by this book.
