Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

Phd by thesis

J. Appl. Cryst.の発刊に際して

Recent developments in isocyanide based multicomponent reactions in applied chemistry

Multicomponent reactions (MCRs) are fundamentally different from two-component reactions in several aspects. Among the MCRs, those with isocyanides have developed into popular organic-chemical reactions in the pharmaceutical industry for the preparation of compound libraries of low-molecular druglike compounds. With a small set of starting materials, very large libraries can be built up within a short time, which can then be used for research on medicinal substances. Due to the intensive research of the last few years, many new backbone types have become accessible. MCRs are also increasingly being employed in the total synthesis of natural products. MCRs and especially MCRs with isocyanides offer many opportunities to attain new reactions and basic structures. However, this requires that the chemist learns the “language” of MCRs, something that this review wishes to stimulate.

Multicomponent Reactions with Isocyanides.

N-Heterocyclic carbenes have become universal ligands in organometallic and inorganic coordination chemistry. They not only bind to any transition metal, be it in low or high oxidation states, but also to main group elements such as beryllium, sulfur, and iodine. Because of their specific coordination chemistry, N-heterocyclic carbenes both stabilize and activate metal centers in quite different key catalytic steps of organic syntheses, for example, C-H activation, C-C, C-H, C-O, and C-N bond formation. There is now ample evidence that in the new generation of organometallic catalysts the established ligand class of organophosphanes will be supplemented and, in part, replaced by N-heterocyclic carbenes. Over the past few years, this chemistry has been the field of vivid scientific competition, and yielded previously unexpected successes in key areas of homogeneous catalysis. From the work in numerous academic laboratories and in industry, a revolutionary turning point in oraganometallic catalysis is emerging.

http://aether.cmi.ua.ac.be/artikels/Artikels%20Gitte/Artikels/Reviews/NHC-%20liganden%20Herrmann.pdf

N-heterocyclic carbenes: a new concept in organometallic catalysis.

https://chemistry-europe.onlinelibrary.wiley.com/doi/pdf/10.1002/chem.201290050

Cover Picture: Ultra‐Rigid Metallocenes for Highly Iso‐ and Regiospecific Polymerization of Propene: The Search for the Perfect Polypropylene Helix (Chem. Eur. J. 14/2012)

Molybdän(III)-Verbindungen als Katalysatoren für die Polymerisation von 2-Methylpropen†

The two neutral complexes [Re(CO)3(H−1taci)] (1) and [ReO3(H−1taci)] (2) (taci=1,3,5-triamino-1,3,5-trideoxy-cis-inositol) were synthesized from the conventional ReI and ReVII precursors (Et4N)2[ReBr3(CO)3] and [ReO3(OSnMe3)]. The crystal structures of 1 and 2, which were determined by single crystal X-ray analysis, are virtually isomorphous. Both compounds crystallize in the orthorhombic space group Pnma, Z=4; 1: a=14.806(3), b=8.466(2), c=9.781(2) A, 2: a=13.050(2), b=8.732(1), c=9.061(1) A. In both complexes, the monodeprotonated H−1taci ligand is bonded to the Re center in an N,O,N-coordination mode. The resulting molecular Cs symmetry is retained in the crystal structure and confirmed by IR spectroscopy of solid-state samples. The observed binding mode of the ligand is discussed in terms of steric and electronic effects.

1,3,5-Triamino-1,3,5-trideoxy-cis-inositol, a Ligand with a Remarkable Versatility for Metal Ions Part XIII. Complex Formation with Rhenium(I) and Rhenium(VII)

The reaction of the tetrametallic molecular loop [(CH3CN)6Mo2(OOC-C4H6-COO)]2[BF4]4 (1) (1 equiv.) with 2 equiv. of bis(diphenylphosphino)amine (dppa), 1,2-bis(diphenylphosphino)ethane (dppe) and bis(diphenylphosphino)methane (dppm) in propionitrile leads to the formation of the still tetrametallic complexes [(CH3CH2CN)4(X)Mo2(OOC-C4H6-COO)]2[BF4]4 (X = dppa (2), dppe (3), dppm (4)), also displaying a loop structure. All three complexes are characterized by NMR spectroscopy (1H, 11B, 13C{1H}, 19F, 31P{1H}), IR spectroscopy, elemental analysis, TG-MS measurements and UV-vis spectroscopy, compounds 2 and 3 additionally by X-ray single crystal diffraction.

/pdf/loop-shaped-dicarboxylate-bridged-dimolybdenum-ii-4ylg6ocrp9.pdf

Eberhardt Herdtweck

Papers

Cover Picture: Ultra‐Rigid Metallocenes for Highly Iso‐ and Regiospecific Polymerization of Propene: The Search for the Perfect Polypropylene Helix (Chem. Eur. J. 14/2012)

Molybdän(III)-Verbindungen als Katalysatoren für die Polymerisation von 2-Methylpropen†

1,3,5-Triamino-1,3,5-trideoxy-cis-inositol, a Ligand with a Remarkable Versatility for Metal Ions Part XIII. Complex Formation with Rhenium(I) and Rhenium(VII)

Loop shaped dicarboxylate-bridged dimolybdenum(II) bisphosphine compounds--a rational synthesis.

Mechanistic investigation of the thermal decomposition of Biphen(OPi-Pr)PtEt2: An entrance into C–C single bond activation?