The present invention discloses processes for oligomerizing an olefin feedstock containing C.sub.4 to C.sub.20 alpha olefins using a catalyst system containing a metallocene compound, an organoaluminum compound, and a suspension of a chemically-treated solid oxide. The liquid medium for the suspension of the chemically-treated solid oxide can be an alpha-olefin oligomer product formed by the oligomerization process.

Methods for determining the concentration of transition metal compounds in a solution containing more than one transition metal compound are described. Polymerization reactor systems providing real-time monitoring and control of the concentrations of the transition metal components of a multicomponent catalyst system are disclosed, as well as methods for operating such polymerization reactor systems and for improving methods of preparing the multicomponent catalyst system.

A process for producing alpha-olefin dimers comprises contacting, at a temperature of 80 C. or more, a feedstock comprising at least one C.sub.8+ (linear) alpha-olefin with a catalyst system comprising activator and one or more catalyst compounds represented by the formula:

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where M is a Group 4 metal; n is 1, 2, or 3; R.sup.A is hydrogen or a C.sub.1 to C.sub.10 alkyl; each of R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, and R.sup.8 is independently selected from hydrogen and C.sub.1 to C.sub.10 alkyl; each X is independently selected from the group consisting of hydrocarbyl radicals having from 1 to 20 carbon atoms, hydrides, amides, alkoxides, sulfides, phosphides, halides, and a combination thereof, (two X's may form a part of a fused ring or a ring system), the contacting being conducted under conditions effective to oligomerize at least part of C.sub.8+ alpha-olefin to produce an oligomerized product containing at least 30 wt % of the alpha-olefin dimer and at least 80 mol % of vinylidene unsaturation, where the conversion of the alpha olefin is at least 10 wt %, based upon the weight of the alpha olefin monomer entering the reactor and the weight of dimer produced.

Metal-organic framework (MOFs) compositions based on postsynthetic metalation of secondary building unit (SBU) terminal or bridging OH or OH.sub.2 groups with metal precursors or other post-synthetic manipulations are described. The MOFs provide a versatile family of recyclable and reusable single-site solid catalysts for catalyzing a variety of asymmetric organic transformations, including the regioselective boryiation and siiylation of benzyiic CH bonds, the hydrogenation of aikenes, imines, carbonyls, nitroarenes, and heterocycles, hydroboration, hydrophosphination, and cyclization reactions. The solid catalysts can also be integrated into a flow reactor or a supercritical fluid reactor.

The present invention relates to a covalent organic framework which is a two-dimensional polymer formed by repeatedly arranging structural units represented by formula I or formula II and bonding same by means of covalent bonds. The present invention also relates to a catalyst, preparation methods for the covalent organic framework and the catalyst, and applications of the covalent organic framework and the catalyst in catalyzing olefin polymerization. The covalent organic framework can be used as a support to control the stereoregular polymerization of olefins in a confined space. The catalyst has high catalytic activity and good high-temperature stability, and widens the range of types of olefin polymerization catalysts.

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A novel metal organic framework, EMM-39, is described having the structure of UiO-66 and comprising bisphosphonate linking ligands. EMM-39 has acid activity and is useful as a catalyst in olefin isomerization. Also disclosed is a process of making metal organic frameworks, such as EMM-39, by heterogeneous ligand exchange, in which linking ligands having a first bonding functionality in a host metal organic framework are exchanged with linking ligands having a second different bonding functionality in the framework.

A novel metal organic framework, EMM-42, is described having the structure of UiO-66 and comprising bisphosphonate linking ligands. EMM-42 has acid activity and is useful as a catalyst in olefin isomerization. Also disclosed is a process of making metal organic frameworks, such as EMM-42, by heterogeneous ligand exchange, in which linking ligands having a first bonding functionality in a host metal organic framework are exchanged with linking ligands having a second different bonding functionality in the framework.

The present invention relates to a process for the oligomerisation of olefins, in particular ethylene, via coordinative chain transfer polymerisation (CCTP) and alkyl elimation reaction. A preferred embodiment of the invention relates to CCTP of olefins, in particular ethylene, with the use of guanidinato, amidinato or hydrocarbyl-2-pyridyl amine complexes of titanium, zirconium or lanthanides, a nickel or cobalt compound as chain displacement catalyst (CDC) and one or more chain shuttling agents (CSA) such as a main group metal alkyl.

Unsaturated and hydrogenated polyalpha-olefin products can be made with a high selectivity toward vinylidenes and tri-substituted vinylenes combined, a high selectivity toward vinylidenes, and a low selectivity toward 1,2-di-substituted vinylenes by using a catalyst system comprising a metallocene compound having the following structure in the polymerization reaction:

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A series of isoreticular metal-organic frameworks composed of metal nodes connected by rigid trigonal prismatic organic linkers and having a 6,12-coordinatled alb network topology are provided. Also provided are methods of synthesizing the metal-organic frameworks and methods of using the metal-organic frameworks to catalyze the hydrolysis of organic molecules, such as nerve agents, having hydrolysable bonds.