Eastman-kodak Company

Eastman Chemical Company

Gerald W Phillips

Thomas Allen Puckette

Thomas James Devon

Jerome L Stavinoha

Jeffrey James Vanderbilt

Stephen Neal Falling

John Robert Monnier

Stephen A Godleski

Howard M Low

Lynda W McGarry

Gregory O Nelson

Laughlin G McCullough

Disclosed is a process for the preparation of 2,5-dihydrofuran compounds by contacting an olefinically-substituted ethylene carbonate compound with a catalyst comprising an acidic component and a halogen component. The process is especially useful for the preparation of 2,5-dihydrofuran from vinyl ethylene carbonate (4-ethenyl-1,3-dioxolane-2-one) which is readily available from 3,4-epoxy-1-butene.

Process for the preparation of 2,5-dihydrofuran compounds

Disclosed are bis-phosphine compounds having the general formula ##STR1## wherein: each of A.sup.1, A.sup.2, A.sup.3 and A.sup.4 is an arylene radical wherein (i) each phosphorus atom P is bonded to a ring carbon atom of A.sup.1 and A.sup.2 and to a ring carbon atom of A.sup.3 and A.sup.4, (ii) A.sup.1 and A.sup.2, and A.sup.3 and A.sup.4 are bonded to each other by ring carbon atoms and (iii) each of the residues ##STR2## constitutes a 5-membered ring; each of A.sup.5 and A.sup.6 is an arylene radical wherein A.sup.5 and A.sup.6 are bonded to each other and to residues R.sup.1 --C--R.sup.2 and R.sup.3 --C--R.sup.4 by ring carbon atoms and R.sup.1 --C--R.sup.2 and R.sup.3 --C--R.sup.4 are connected to each other through a chain of 4 carbon atoms; and

Hydroformylation process using novel phosphine-rhodium catalyst system

Disclosed is a continuous process for the manufacture of 2,5-dihydrofurans by the isomerization of .gamma.,.delta.-epoxyalkenes in the liquid phase in the presence of a catalyst system comprising an onium iodide compound and a Lewis acid and a process solvent comprising a mixture of the 2,5-dihydrofuran product of the process and an oligomer of the .gamma.,.delta.-epoxyalkenes reactant.

Continuous process for the manufacture of 2,5-dihydrofurans from

Disclosed is a process for the production of an equilibrium mixture of 2-hydroxytetrahydrofuran and 4-hydroxybutanal by a two-step process comprising (1) heating 2,5-dihydrofuran in the presence of a catalyst system comprising a phosphine, ruthenium or rhodium to convert the 2,5-dihydrofuran to 2,3-dihydrofuran; and (2) contacting 2,3-dihydrofuran with water in the presence of an acidic catalyst to convert the 2,3-dihydrofuran to a mixture of 2-hydroxytetrahydrofuran and 4-hydroxybutanal. Also disclosed is a process for the continuous production of an aqueous solution of 2-hydroxytetrahydrofuran and 4-hydroxybutanal. The mixture of 2-hydroxytetra-hydrofuran and 4-hydroxybutanal may be catalytically hydrogenated to produce 1,4-butanediol.

Process for the production of mixtures of 2-hydroxytetrahydrofuran and

Disclosed are processes for the isomerization of epoxyalkenes to dihydrofurans by contacting an epoxyalkene with a catalyst comprising a quaternary organic onium iodide compounds, optionally deposited on a non-acidic support and/or in combination with a Lewis acid co-catalyst. The catalyst may comprise a supported catalyst, an unsupported catalyst or a solution of the catalytically-active components in an inert, organic solvent.

Isomerization of epoxyalkenes to 2,5-dihydrofurans

A process is disclosed for preparing biaryl, bidentate ligands comprising:

Preparation of bidentate ligands

The hydroformylation of olefins with rhodium complex catalysts is described. The catalysts employed comprise a rhodium complex with at least one bidentate ligand having a specified structure, ##STR1## Hydroformylation reactions at relatively low temperatures and pressure and yet with high rates of reaction and high selectivity to aldehyde product are obtained by the practice of the present invention.

Low pressure rhodium catalyzed hydroformylation of olefins

A novel ligand for use in hydroformylation reactions wherein at least one olefin having from 2 to 20 carbon atoms is contacted in a reaction zone at a temperature of from about 20.degree. C. to about 250.degree. C. and a pressure of from about 50 psig to about 800 psig with hydrogen, carbon monoxide, and a catalyst containing rhodium, the ligand having the formula ##STR1## wherein: n is 1-4;

Chelate ligands for low pressure hydroformylation catalyst and process

The process for preparing a bidentate ligand comprising the steps,

A hydroformylation process including contacting hydroformylation stock in a reaction zone at a temperature of from about 20.degree. C. to about 250.degree. C. and a pressure of from about 15 psig to about 800 psig with hydrogen and carbon monoxide wherein the catalyst comprises rhodium in chemical complex with one or more ligands of the formulae ##STR1## wherein: Z, when present, represents the atoms necessary to form with adjacent carbons on the benzene nucleus a fused divalent ring structure having up to about 20 ring carbons;

Chelating ligands and catalysts and processes employing the same

A hydroformylation process including contacting hydroformylation stock in a reaction zone at a temperature of from about 20.degree. C. to about 250.degree. C. and a pressure of from about 15 psig to about 800 psig with hydrogen, carbon monoxide, wherein the catalyst comprises rhodium in chemical complex with one or more ligands of the formulae ##STR1## wherein: the x and y bonds are adjacent on ring structures,

Growing community of inventors

Longview, TX, United States of America

Gerald W Phillips