Showing papers by "Malcolm L. H. Green published in 1975"
TL;DR: In this article, an apparatus for the generation of metal vapours and their reactions with potential ligand precursors is described, and a symmetry sandwich structure is proposed for these compounds on the basis of 1H n.m.r, mass, and photoelectron spectroscopy.
Abstract: An apparatus for generation of metal vapours and their reactions with potential ligand precursors are described. Co-condensation of titanium atoms with benzene, toluene, or mesitylene gives the compounds [(H6C6)2Ti], [(MeC6H5)2Ti], and [(mes)2Ti], respectively. Symmetrical sandwich structures are proposed for these compounds on the basis of 1H n.m.r., i.r., mass, and photoelectron spectroscopy.
44 citations
TL;DR: In this paper, the catalytic activity of butadiene oligomerization of zerovalent di(η-arene)titanium compounds has been explored under a variety of conditions.
Abstract: The catalytic activity towards butadiene oligomerisation of zerovalent di(η-arene)titanium compounds has been explored under a variety of conditions. Co-condensations of metal atoms from the vapours of Ti, V, Cr, Mn, Fe, Co, or Ni with butadiene in benzene show that oligomerisation of butadiene is catalysed by all these metal atoms except titanium. Similar experiments, in which co-catalysts such as alkylaluminium halides or ligands such as tertiary phosphines are also present, have also been made. It is shown that the additional ligand or co-catalyst may change the nature of the oligomerisation product.
28 citations
TL;DR: In this paper, photolysis of [(η-C5H5)2WH2] in methanol gives the compounds (η −-C 5H5 )2WH(OMe) and [( η −C 5 H5) 2W(Me)(OMe))], and tungstenocene is proposed as an intermediate.
Abstract: Photolysis of [(η-C5H5)2WH2] in methanol gives the compounds [(η-C5H5)2WH(OMe)] and [(η-C5H5)2W(Me)(OMe)]; tungstenocene is proposed as an intermediate.
10 citations
TL;DR: The findings suggest the higher phase IV in lateral positions is due to sequence of emptying without airway closure and is influenced by active expiration.
Abstract: We studied the effect of body position in humans on the relationship between exhaled vital capacity (VC) and both helium (He) and nitrogen (N2) concentrations after delivery of an He bolus at residual volume (RV) followed by 100% oxygen to total lung capacity. Phase IV, defined as the % VC at the first sharp and permanent increase in N2 and He, occurred at a mean of 15.7% VC while seated, 60.0% VC in right lateral and 59.6% VC in left lateral positions. He bolus delivery above RV but well below 60% VC resulted in the disappearance of phase IV. Lung pressure-volume (PV) curves had inflections at the volume of phase IV in the seated position: but the inflections were well below phase IV in lateral positions. Phase IV increased to higher volumes at higher mouth pressures. The relationship between phase IV and mouth pressure fell near the respiratory system relaxation PV curves. The findings suggest the higher phase IV in lateral positions is due to sequence of emptying without airway closure and is influenced by active expiration.
6 citations
TL;DR: In this article, the Inorganic Chemistry Laboratory at Oxford have developed an apparatus for making small quantities of very reactive organometallic molecules, some of which are used as catalysts in the synthesis of polymer materials.
Abstract: Interesting new organometallic compounds which are at present otherwise unobtainable may be readily made from metal atom vapours which are now used as routine reagents in synthesis, catalysis and other reactivity studies. A versatile new apparatus for making small quantities of these very reactive organometallic molecules, some of which are used as catalysts in the synthesis of polymer materials, is now in regular use at the Inorganic Chemistry Laboratory at Oxford.
4 citations
TL;DR: In this paper, an improved synthesis of the compound [(η-C5H5]-Mo] is described and the new "bent" sandwich compounds (η−-C6H6)-MoX and η−C5h5−C6h6]-MoL]-PF6 are reported.
Abstract: An improved synthesis of the compound [(η-C5H5)(η-C6H6)Mo] is described and the new ‘bent’ sandwich compounds [(η-C5H5)(η-C6H6)MoX](X = Me, Cl or I) and [(η-C5H5)(η-C6H6)MoL]+PF6–(L = C2H4, C2H2, or PPh3) are reported.
3 citations
TL;DR: Co-condensation of atoms of the metals given in the title with butadiene and a cocatalyst such as [Et2AlCl]2 in toluene causes the oligomerisation of butadienes.
Abstract: Co-condensation of atoms of the metals given in the title with butadiene and a cocatalyst such as [Et2AlCl]2 in toluene causes the oligomerisation of butadiene; in some cases the cocatalyst is not necessary and addition of the metal atoms alone to butadiene in toluene causes efficient oligomerisation.
TL;DR: In this article, the katalytische Aktivitat von nullwertigem Dibenzol-and Ditoluol-Ti gegenuber der Oligomerisation von Butadien unter verschiedenen Bedingungen wird untersucht.
Abstract: Die katalytische Aktivitat von nullwertigem Dibenzol- und Ditoluol-Ti gegenuber der Oligomerisation von Butadien unter verschiedenen Bedingungen wird untersucht.
TL;DR: In this article, photolysis of [(η-C5H5)2WH2] in methanol gives the compounds (η −-C 5H5 )2WH(OMe) and [( η −C 5 H5) 2W(Me)(OMe))], and tungstenocene is proposed as an intermediate.
Abstract: Photolysis of [(η-C5H5)2WH2] in methanol gives the compounds [(η-C5H5)2WH(OMe)] and [(η-C5H5)2W(Me)(OMe)]; tungstenocene is proposed as an intermediate.