Abstract: This invention relates to polymetallooxanes having the moiety: ##STR1## wherein n is 1.5, 2, 3, 4, 5 or 6, M.sup.1 is selected from the group consisting of Si, Ge, Sn, Al, Ga, Ti, Zr, or Hf, R.sup.1 and R.sup.2 are selected from the group consisting of H, OH, C.sub.1-8 alkyl, C.sub.1-6 alkoxy, C.sub.2-8 alkene, C.sub.6-12 aryl, C.sub.1-8 hydroxyalkyl, C.sub.1-8 thioalkyl, C.sub.2-12 alkoxyalkyl, C.sub.4-20 heteroaromatic, C.sub.1-10 alkylsilane, C.sub.1-10 alkylsiloxane or combinations thereof, O' is bonded to M.sup.1, another M.sup.1 atom, M.sup.2 or H, wherein M.sup.2 is a group I or II metal of the Periodic Table, and R.sup.3 is independently selected from the group consisting of (CR.sub.2).sub.y, O'--(CR.sub.2 CR.sub.2).sub.y N(CR.sub.2).sub.y --, --(CR.sub.2 CR.sub.2).sub.y N.sub.R (CR.sub.2).sub.y --, O'--[(CR.sub.2 CR.sub.2).sub.y O].sub.y --(CR.sub.2).sub.y, C.sub.1-8 alkyl, C.sub.1-6 alkoxy, C.sub.2-8 alkene, C.sub.6-12 aryl, C.sub.1-8 hydroxyalkyl, C.sub.1-8 thioalkyl, C.sub.2-12 alkoxyalkyl, C.sub.

Abstract: Silazanes and related compounds are prepared by (a) providing a precursor containing at least one Si--N bond, cleaving an Si--N bond in the precursor in the presence of hydrogen or a hydrogen donor, and reacting the cleavage product with a second cleavage product or with a compound containing an Si--H bond, an N--H bond, or both, to produce an initial silazane product having at least one newly formed Si--N bond or (b) providing one or more reactants which contain an Si--H bond and an N--H bond, and causing reaction to occur between the two bonds in the presence of a transition metal catalyst to form an initial silazane product having newly formed Si--N bonds. Further products may result from additional reaction of either type. Novel compounds, including siloxazanes and high molecular weight polysilazanes, are provided. The compounds may be pyrolyzed to yield ceramic materials such as silicon nitride, silicon carbide and silicon oxynitride.

Abstract: Silicon and aluminum complexes having the following formula I, II or III: ##STR1## wherein x is 0 or 1, T is H or ##STR2## each R is independently selected from the group consisting of H, OH, C.sub.1-6 alkyl, C.sub.1-6 alkoxy, C.sub.2-6 alkene, C.sub.6-12 aryl, C.sub.1-6 hydroxyalkyl, C.sub.1-6 thioalkyl, C.sub.2-12 alkoxyalkyl, C.sub.3-20 heteroaromatic, and combinations thereof, wherein R may further contain one or more atoms of a non-carbon element such as Si, Ge, Sn, P, and the like; Y is a cation, and Z is a multivalent cation, are prepared by reacting silica or alumina with a diol, in the presence of a base, while removing water formed during the reaction. Methods for producing such complexes starting with silica or alumina, and methods for converting such complexes into other silicon or aluminum-containing compounds, are disclosed.

Abstract: A process is provided for the preparation of metals, metal carbides, nitrides, borides, silicides, sulfides and phosphides by low temperature pyrolysis of a selected organometallic precursor. The precursor, in addition to containing organic ligands, contains the metal M, which is a transition metal or tin, and the element X (C, N, B, Si, S, or P), which may be bound directly to M, contained within the ligands, or both. The process enables one to provide surface coatings or shaped articles of metals, metal carbides, nitrides, and the like.

Abstract: Silicon and aluminum complexes having the following formula: ##STR1## wherein x is 0 or 1, T is H or ##STR2## each R is independently selected from the group consisting of H, OH, C.sub.1-6 alkyl, C.sub.1-6 alkoxy, C.sub.2-6 alkene, C.sub.6-12 aryl, C.sub.1-6 hydroxyalkyl, C.sub.1-6 thioalkyl, C.sub.2-12 alkoxyalkyl, C.sub.3-20 heteroaromatic, and combinations thereof, wherein R may further contain one or more atoms of a non-carbon element such as Si, Ge, Sn, P, and the like; and Y is a cation, are prepared by reacting silica or alumina with a diol, in the presence of a base, while removing water formed during the reaction. Methods for producing such complexes starting with silica or alumina, and methods for converting such complexes into other silicon or aluminum-containing compounds, are disclosed.

Abstract: A tractable ceramic precursor and method for producing the same, capable of being formed into useful shapes at low temperatures and thereafter capable of transformation into high-temperature superconducting ceramics is provided. The method consists of preparing one or more organometallic compounds selected from organometallic clusters and organometallic polymers and combining them in the proper stoichiometric ratio to form a tractable ceramic precursor having rheological/viscoelastic properties suitable for forming useful shapes and having metal elements in suitable proportions to form high-temperature superconducting ceramics.

Abstract: A process for preparing tractable preceramic precursors of Group IIIA metal/Group VA nonmetal compounds, such as BN, in which a first reactant containing a Group VA nonmetal to hydrogen bond, such as ammonia or an amine is reacted with a second reactant containing a Group IIIA metal to hydrogen bond, such as a metal hydride, in the presence of a metal catalyst that catalyzes dehydrocoupling of the bonds to form the precursor. Further reaction of the precursor in the presence of the catalyst forms oligomeric/polymeric forms of the precursor.

Abstract: Silazanes and related compounds are prepared by (a) providing a precursor containing at least one Si-N bond, cleaving an Si-N bond in the precursor in the presence of hydrogen or a hydrogen donor, and reacting the cleavage product with a second cleavage product or with a compound containing an Si-H bond, an N-H bond, or both, to produce an initial silazane product having at least one newly formed Si-N bond or (b) providing one or more reactants which contain an Si-H bond and an N-H bond, and causing reaction to occur between the two bonds in the presence of a transition metal catalyst to form an initial silazane product having newly formed Si-N bonds. Further products may result from additional reaction of either type. Novel compounds, including siloxazanes and high molecular weight polysilazanes, are provided. The compounds may be pyroloyzed to yield ceramic materials such as silicon nitride, silicon carbide and silicon oxynitride.

Abstract: Coatings of metals, metal alloys, metal carbides, nitrides, borides, silicides and phosphides are provided. A precursor having organic ligands bonded to one or more metal atoms, such precursor having the element X also bonded directly or indirectly to the metal or metals, is pyrolyzed on a substrate surface to give a coating of M.sub.a X.sub.b. M represents a transition, lanthanide or actinide metal or tin, X represents C, N, B, Si, or P, and a and b represent the atomic proportions of M and X. The subscript b may be zero if an alloy or pure metal is to be prepared. The product M.sub.a X.sub.b can be prepared by relatively low temperature pyrolysis and the precursor can be used as a solution or a low melting solid.

Abstract: A process is provided for the preparation of metals, metal carbides, nitrides, borides, silicides, sulfides and phosphides by low temperature pyrolysis of a selected organometallic precursor. The precursor, in addition to containing organic ligands, contains the metal M, which is a transition metal or tin, and the element X (C, N, B, Si, S, or P), which may be bound directly to M, contained within the ligands, or both. The process enables one to provide surface coatings or shaped articles of metals, metal carbides, nitrides, and the like.

Abstract: Preparation of metal carbides, nitrides, borides, silicides and phosphides, also metal alloys and pure metals, by providing a precursor in which there are organic ligands bonded to the metal or metals, such precursor having the element X also bonded directly or indirectly to the metal or metals, the ligand-metal bonding being weaker than the X-metal bonding whereby on pyrolysis the product M.sub.a X.sub.b results in which M represents the metal or metals, X represents C, N, B, Si, P and a and b represent the atomic proportions of M and X. The subscript b may be zero if an alloy or pure metal is to be prepared. The product M.sub.a x.sub.b can be prepared by relatively low temperature pyrolysis and the precursor can be used as a solution or a low melting solid. This enables one to apply a surface coating or to shape the precursor into a fiber, rod or other shape and to pyrolyze the coating or shaped article. M is a transition, lanthanide or actinide metal or tin.

Abstract: A process for preparing tractable preceramic precursors of Group IIIA metal/Group VA nonmetal compounds, such as BN, in which a first reactant containing a Group VA nonmetal to hydrogen bond, such as ammonia or an amine is reacted with a second reactant containing a Group IIIA metal to hydrogen bond, such as a metal hydride, in the presence of a metal catalyst that catalyzes dehydrocoupling of the bonds to form the precursor. Further reaction of the precursor in the presence of the catalyst forms oligomeric/polymeric forms of the precursor.

Abstract: Transition metal carbides in which the carbon is in excess and is covalently bound to the metal are produced by pyrolyzing transition metal amides that have two or more metal atomos, such as hexakis(dimethylamido) ditungsten or dimolybdenum.

Abstract: Si-N groups in silazanes (which may be siloxazanes) are cleaved in the presence of a suitable catalyst or one or more reactants containing an Si-H group and an N-H group (in the same molecule or in different molecules) are reacted in the presence of a suitable catalyst. New silazane products result including oligomers and polymers. Suitable catalysts include metal carbonyl complexes and heterogeneous metal catalysts such as platinum on carbon. Immediate products of reaction such as products containing Si-H and N-H groups resulting from Si-N cleavage and Si-N products resulting from Si-H+N-H reactions undergo further reaction, resulting in many cases in a mixture of oligomers or of oligomers and polymers. The initial reactants may be open chain or ring compounds containing Si-N or Si-H+N-H in an open chain or in a ring or as pendant groups.

Abstract: The present invention discloses a process for forming a catalyst for the hydrodenitrogenation of an organic feedstock, which includes (a) obtaining a precatalyst comprising cobalt and molybdenum or nickel and molybdenum; (b) adding in a non-oxidizing an atmosphere selected from hydrogen, helium, nitrogen, neon, argon, carbon monoxide or mixtures thereof to the precatalyst of step (a), a transition metORIGIN OF THE INVENTIONThis invention was made in the course of research partially sponsored by the Department of Energy through grants DE-FG22-83P C60781 and DE-FG-85-PC80906, and partially supported by grant CHE82-19541 of the National Science Foundation. The invention is subject to Public Law 96-517 (and amendments), and the United States Government has rights in the present invention.

Abstract: In the transalkylation of tertiary amines, unexpected higher yields are achieved requiring substantially less catalyst and much shorter reaction times at lower reaction temperatures using a homogeneous catalyst in the presence of an alcohol solvent and carbon monoxide. The process may be exemplified by reacting triethylamine and tripropylamine in the presence of a homogeneous triosmiumdodecacarbonyl catalyst, ethanol, and carbon monoxide to prepare diethylpropylamine and ethyldipropylamine.

Abstract: Method of producing polysilazanes from precursors having Si-H, Si-N or Si-Si bonds in the presence of a catalyst effective to activate such bonds. The catalyst may be a metal complex, e.g. a carbonyl cluster, which is soluble in an organic solvent and is homogeneous or it may be a heterogeneous catalyst. Higher polymers, and/or less crosslinking and oligomer formation, and/or greater control over the product and/or faster reactions and/or greater yields result. The polymers are soluble in common organic solvents and/or are solids which can be shaped. The products can be pyrolyzed to silicon nitride or used without pyrolysis.

Abstract: A process for separating oxygen from gas mixture containing oxygen is disclosed. The gas mixtures are contacted with a solution of an organometallic complex oxygen carrier and an electrolyte in an organic solvent. During the contact, oxygen is bound to the carrier. After the contacting step is completed the solution is electrochemically oxidized with resultant release of oxygen which is recovered. The solution is then electrochemically reduced bringing the oxygen carrier to its original condition and ready for reuse.

Abstract: Long chain alkylamines are synthesized by the oligomerization of shorter chain alkylamines at a temperature between 50.degree.-250.degree. C. and a pressure between 1-300 atmospheres in the presence of a catalyst mixture comprising a fluoroborate salt and a ruthenium, an osmium, or an iridium compound.

Abstract: Aminomethylation of olefins which employs a homogeneous catalyst which is a solution in a suitable solvent of mixed ruthenium and iron carbonyls. The overall reaction may be represented as follows: ##STR1## where R.sub.1 and R.sub.2 are hydrogen or essentially hydrocarbon groups. The reaction proceeds by way of an aldehyde intermediate. Accordingly, the starting material may be an aldehyde instead of an olefin.