PREPARATION OF AMINES FROM OLEFINS USING CERTAIN TRANSITION METAL CATALYSTS

Abstract: Aliphatic and aromatic amines are produced by reacting an olefin with either ammonia or a primary or secondary amine in the presence of a catalytic amount of a ruthenium or iron compound catalyst, either dissolved in an inert solvent or in the absence of a solvent, at a temperature of 100 to 250°C and a pressure of from atmospheric to 12,000 psig. Amines have many important commercial uses such as intermediates in the manufacture of rubber products, pharmaceuticals, insecticides, dyestuffs, textile finishing agents, etc.

Description: PREPARATION OF AMINES FROM OLEFINS USING CERTAIN TRANSITION METAL CATALYSTS BACKGROUND OF THE INVENTION This invention relates to the preparation of aliphatic and aromatic amines by a catalytic reaction of-an olefin with ammonia or a primary or secondary amine. More particularly, this invention relates to the preparation of amines in the presence of a catalyst which is a simple salt, an organometallic compound, or a coordination compound of ruthenium or iron. Prior-art large volume manufacturing processes for the production of amines involve the reductive amination of alcohols, ethers, ketones, or aldehydes. These processes suffer from the by-product formation of water, which, in the presence of product amines and unreacted starting materials, results in difficult and expensive separation and purifications steps to recover the desired product. U. S. Patents 2,417,842 and 3,412,158 describe the reaction of ammonia with olefins in the vapor phase over Group VIII metal and metal oxide catalysts to produce a mixture of amines, nitriles, and degradation products. Alkali metals and alkali metal hydrides have also been used in the preparation of amines from olefins in the vapor phase as described in U.S. Patent 2,501,556, but the products here also are mixtures of amines, nitriles, and degradation products. Due primarily to low conversions, poor selectivity to specific amines, and short catalyst life, no known commercial process has been developed based on these technologies. It has been reported in the literature that °Qprdination compounds of certain transition metals are effective catalysts for a variety of cormnercially important olefin reactions. These catalysts are thought to function by bonding with both reacting species, and bringing them into close proximity and providing an electronic and steric environment conducive to a desired transformation. Prior-art attempts have been made to catalyze the addition of ammonia or amines to olefins with coordination compounds of palladium, platinum, and rhodium. These experiments are reported in A. DeRenzi, Gazetta Chemica Italiana 102, 281 C1972); B. Akermark, J. Orgmet. Chem. 72, 127 C19741; B. Akermark, Tetrahedron Letters 15, 1363 C1974r; A. Panunzi, JACS 91, 3879 (19691; E. Benedetti, Gazetta Chemica Italiana 102, 744 C1972l; and D. Kollings, J. Orgmet. Chem. 54, 399 (1973). With these coordination compounds of palladium and platinum, organometallic intermediates are obtained that can be hydrolyzed to alkyl amines in high yields Since the hydrolysis is irreversible, the reaction is stoichiometric rather than catalytic. U.S. Patent 3,758;586 discloses that certain coordination compounds of rhodium, secondary amines and ethylene react catalytically to give free tertiary amines. It is also disclosed that ammonia and primary amines are ineffective in this reaction, and that the reaction is operative only with ethylene. No prior art was found that suggests that either ruthenium or iron compounds could be used to catalyze the reaction of an olefin and ammonia or amine. These ruthenium and iron compounds are commercially attractive because they are less expensive than platinum, palladium or rhodium compounds. STATEMENT OF THE INVENTION This invention is directed to a process for the production of aliphatic and aromatic amines which comprises reacting an olefin with either'ammonia, a primary amine or a secondary amine in the presence of a catalyst dissolved in a liquid phase solvent at a temperature of 100O to 2500C and at a pressure from atmospheric to 12,000 psig, said catalyst being selected from the class consisting of i) a ruthenium or iron salt, ii) a coordination compound of ruthenium or iron, and iii) an organo-metallic compound of ruthenium or iron, whereby an N-H bond is added across the dodblevol-J ^- of the olefin. DEFINITIONS A series of iron catalysts have now been discovered that catalyze the addition of primary amines, secondary amines, or ammonia to olefins. In addition, it has been discovered that simple salts of ruthenium'as well as certain coordination compounds of ruthenium are also catalysts for this reaction. The present invention can be described by the equation: EMI5.1 which indicates that aiN-Il bond adds across the double bond of an olefin. Suitable amines include ammonia, dimethylamine, diethylamine, piperidine, and other such primary and secondary amines. The olefins used have been alpha-olefins including methylene, propylene, and isobutylene. Other homologs may be used. Solvents used in this invention can be either the reactants or products, or can be solvents chemically inert to reactants and products that are capable of dissolving substantial amounts of the particular catalyst. Typical examples are: saturated aliphatic hydrocarbons, such as hexane, heptane, cyclohexane; aromatic hydrocarbons, such as toluene, xylene and benzene; ethers such as tetra hydrofuran, 1,4-dioxane, ethylene glycol monornethyl ether; saturated aliphatic alcohols, such as methanol and ethanol; and the reactant or product amines, such as diethylamine, piperidine, and triethylamine. Temperatures in the range of 1000 to 2350C are useful for carrying out this invention. The preferred temperature range is 1000 to 190 0C. Pressures in the range of atmospheric to 12,000 psig are useful for carrying out this invention. Pressures in the range of 200 psig to 1500 psig are preferred. The proportion of olefin, amine, and catalyst are not critical and any amounts of these three components which are brought together under the conditions of this invention will produce the desired product amineCs). The catalyst is any of three types of ruthenium or iron compounds. The first type is a simple salt of either ruthenium or iron. The second type is a coordination compound of either ruthenium or iron. The third type is an organometallic compound of either ruthenium or iron. The preferred ruthenium and iron salts are salts of strong mineral acids or organic acids. Specific examples of such salts include the chloride, bromide, iodide, nitrate, sulfate, phosphate, formate, and acetate salts and their hydrates. The preferred coordination compounds of ruthenium are: RuCl2 (triphenylphosphine)3: Ru(cyclopentadienyl)2; Ru(2,4-pentanedioate)3; Ru(dimethylglyoxime)2Cl; Ru(2-cyanopyridine)2 Cl; Ru(triphenylarsine)2 Cl3; Ru(N,N-ethylene-bis-salicylideneamine)Cl3; Ru(8-hydroxyquinoline)2 Cl; Ru(2-hydroxyquinoline)2 Cl; Ru(dimethylglyoxime)4 Cl2; Ru(2,2'-bipyridine)2 Cl; K4Ru(CN)6.3H2O; [Ru(NH3)4 OH Cl]Cl.2H2O; Ru(NO) (NO3)3 The preferred coordination compounds of iron are: Fe(CO)5 H2Fe(CO)4 Fe2(CO)9 Fe(cyclohexadienyl) (CO)3 Fe(butadine) (CO)3 FeHg(CO)4 HgCl (cyclopenta- Fe(CO)4 [(C6H5)3 P] dienyl)2 Fe Fe(CO)4 [(C6H5O)3 P] The e amount of catalyst employed in this process is from a-bout 0.1 to 50 mole % of the total moles" reactants, i.e., olefin and ammonia or amine. Preferably the amount of catalyst is kept as low as possible and yet sufficient to provide good yields and good kinetics. Normally 0.5-10 mole%is sufficient to accomplish these objectives. The process of this invention is nonlimiting. It may be carried out on a batch basis, or it is equally adaptable to a continuous basis by employing known means for introducing the reactants, catalyst, and optional solvent to the reactions zone and for withdrawing the products and recovering starting materials therefrom. As indicated by the low molar percentage of catalyst to reactants, the reaction is truly catalytic rather than stoichiometric in nature. EXAMPLES The folloving examples illustrate various embodiments of this invention. Parts and percentages are by weight, temperatures are in degrees Centigrade, and pressures are in pounds per square inch gauge unless otherwise specified. Convensions and yields given in these examples are based on the isolated liquid products. Major products were identified by gas chromatographic and mass spectroscopic analytical methods, and when necessary, were confirmed by infrared spectroscopy. Those minor products which are not identified are assumed to have the same gas chromatographic response factor as the major amine product. In all the test ruu5it has been observed that no products are formed in either the absence of catalyst or in the presence of an ineffective catalyst. EXAMPLE 1 A mixture of 89 parts of tetrahydrofuran, 5.6 parts of dimethylamine and 0,315 g of ruthenium trichloride hydrate were placed in a 300 cm3 stainless steel autoclave. The autoclave was pressured with 10 psig of hydrogen and 200 psig of ethylene. The mixture was heated in stages at 150 C (1 hr.l, 1700C ci hr.), and 1905C (5 hrs.). A total of 0.16 parts of dimethylethylamine and 3.3 parts of diethylmethyl amines were obtained corresponding to a conversion of 35% and a combined yield of 92%. EXAMPLE 2 A mixture of 89 parts of tetrahydrofuran, 5.6 parts of dimethylamine and 0.289 parts of RuCcyclo pentadienyl)2 were placed in a 300 ml stainless steel autoclave. The autoclave was pressured with 200 psig of ethylene. The mixture was heated in stages at 1500C (1 hr.), 170 C (1 hr.), and 1900C (5 hrs.). A total of 1.3 parts of dimethylethylamine were obtained corresponding to a conversion of 1% and a yield of 99% (based on dimethylamine). EXAMPLE 3 A mixture of 104 parts of 1,4-dioxane, 5.6 parts of dimethylamine and 0.363 parts of [RU(NH3)4 (OH)Cl]. 2H2O were placed in a 300 ml stainless steel autoclave. The autoclave was pressured with 200 psig of ethylene. The mixture was heated in stages at 1500C Cl hr), 170 C 61 hr), and 190 C (5 hrs). A total of 0.12 parts of dimethylethylamine and 2.1 parts of diethylmethylamine were obtained corresponding to a conversion of 21% and a combined yield of 99% (based on dimethylamine). EXAMPLE 4 A mixture of 104 parts of 1,4-dioxane and 0.315 parts of ruthenium trichloride hydrate were placed in a 300 cm3 stainless steel autoclave. The autoclave was pressured with 200 psig of anhydrous ammonia and 200 psig of ethylene. The mixture was heated in stages at 1500C t1 hr.), and 1700C (1 hr), and 1900C (5 hrs). The resulting reaction mixture was analyzed by gas liquid chromatography and was found to contain monoethylamine, diethylamine, and triethylamine. Although the invention has been described in con siderable detail with reference to certain preferred embodiments thereof, it will be understood that variations and modifications can be effected within the spirit and scope of the invention as described herein-above and as defined in the appended claims. EXAMPLE 5 A mixture of 18.3 parts of anhydrous diethylamine and 2.0 parts of FeCCO)5 was placed in a 300 ml stainless steel autoclave. The autoclave was pressured with 300 psig of ethylene. The mixture was heated in stages at 150 C (I hr.) and 17Q C C5 hrs.). A total of 6.6 parts of triethylamine and Q.4 parts of mono ethyl amine were obtained corresponding to a conversion of 28.2% and a combined yield of 100% (based on diethylamine). EXAMPLE 6 A mixture of 100 parts of toluene, 9.1 parts of diethylamine and 0.97 parts Fe (butadiene) (CO)3 were placed in a 300 cm3 stainless steel autoclave. The autoclave was purged with ethylene and pressured with ethylene to 200 psig. The mixture was heated in stages at 150 C (1 hr.), 1700C (l hr.), and 1900C (5 hrs.). A total of 1.6 parts of triethylamine were obtained corresponding to a conversion of 12.8% and a yield of.100% (based on diethylamine). EXAMPLE 7 A mixture of 10Q parts of 1,4-dioxane, 9.1 parts of diethylamine and 0.98 parts of Fe(CO)5 were placed in a 300 cm3 stainless steel autoclave. The autoclave was purged with ethylene and pressurized with ethylene to 200 psig. The mixture was heated in stages at 1500C (1 hr.l, 1700C (1 hr.), and 1900C C5 hrs.). A total of 1.8 parts of triethylamines were obtained corresponding to a conversion of 14.1% and a yield of 93% Cbased on diethylamine). EXAMPLE 8 A mixture of 55 parts of ammonia and 0.98 parts of Fe(CO)5 were placed in a 300 cm3 stainless steel autoclave. The autoclave was pressured with 200 psig of ethylene. The mixture was heated at 1200C for 5 hrs. The autoclave was chilled with a dry ice/acetone bath opened to the atmosphere and 100 parts of toluene added. After warming to room temperature with the resultant evaporation of excess ammonia, the mixture was analyzed by gas liquid chromatography and was found to contain monoethylamine, diethylamine and tri ethylwmine. EXAMPLE 9 A mixture of 10 parts of ammonia, 1.96 parts of 2.02 parts of tri-n-butylphosphine and 14 parts of isobutylene were placed in a 300 cm stainless steel autoclave. The autoclave was sealed and heated to 1700C for 5 hrs: The autoclave was chilled with a dry ice/acetone bath, opened to the atmosphere and 50 parts of toluene added. After warming to room temperature with the resultant evaporation of excess ammonia and isobutylene, the mixture was analyzed by gas liquid chromatography and was found to contain isobutyl amine. EXAMPLE 10 A mixture of 21.3 parts of piperidine, 1.96 parts of Te(CO)5 and 0.27 parts of mercuric chloride were placed in a 300 cm3 stainless steel autoclave. The autoclave was purged with ethylene and pressurized with ethylene to 300 psig. The mixture was heated in stages at 1500C C1 hr.) and 1700C (5 hrs.). A total of 2.1 parts of N-ethylpiperidine were obtained corresponding to a conversion of 8% and a yield of 99% Cbased on piperidine). EXAMPLE 11 A mixture of 18.3 parts of anhydrous diethylamine, 2.0 parts of FeCCO)5 and 3.1 parts of triphenylphosphite were placed in a 300 ml stainless steel autoclave. The autoclave was pressured with 300 psig of ethylene. The mixture was heated in stages at 1500C Cl hr.) and 1700C CS hrs.). A total of 10.5 parts of triethylamine and 0.6 parts of monoethylamine were obtained corresponding to a conversion of 47.4% and a combined yield of 98.4 (based on diethylamine). EXAMPLE 12 A mixture of 23.3 parts of anhydrous aniline, 2.0 parts of Fe(CO15 and 3.1 parts of triphenylphosphite were placed in a 300-ml stainless steel autoclove. The autoclave was pressured with 300 psig of ethylene. The mixture was heated in stages at 1300C (1 hr.), 140 C (1 hr.) and 150 C (5 hrs.@. A total of 3 parts of N-ethyl aniline, 1 part 2-methylquinoline, 1 part diethyl aniline, 0.5 parts 2-Cl- butenyl)aniline and Q.25 parts of, N-ethyl toluidine were obtained corresponding to a conversion of 17.38 and a combined yield of 100% (based on aniline).

Claims: What is Claimed' Is: 1. A process for the production of aliphatic and aromatic amines which comprises reacting an olefin with either ammonia, a primary amine, or a secondary amine in the pretence of a catalyst dissolved in a liquid phase solvent at a temperature of 100 C to 250 C, and at a pressure from atomospheric to 12000 psig, said catalyst being selected from the class consisting of i) a ruthenium or iron salt, iii a coordination compound of ruthenium or iron, and iiil an organo-metallic compound of ruthenium or iron, whereby an N-H bond is added across the double bond of the olefin. 2. The process of Claim 1 wherein the temperature is 1100 -1900C and the pressure is 200-15Q0 psig. 3. The process of Claim 1 wherein the solvent must be capable of dissolving substantial amounts of the catalyst and is selected from the class consisting of a) the reactants or products and b) a solvent chemically inert to the reactants and products selected from 1) a saturated aliphatic hydrocarhon, 21 an aromatic hydrocarbon, 3) an ether a saturated aliphatic alcohol, or 41 an amine. 4. The process of Claim 1 wherein the ruthenium or iron salt is a salt or a salt hydrate of a strong mineral acid or an organic acid. 5. The process of Claim 1 wherein the coordination complex of ruthenium is selected from the group consisting of: RuC12 Ctriphenylphosphine)3 Ru [cyclopentadienyl)2 Ru C2,4-pentanedionate) Ru (dimethylglyoxime)2 Cl, Ru (2-cyanopyridine]2 Cl, Ru (triphenylarsine)2 Cl3, Ru (N,N-ethylene-bis-salicylideneamine < Cl3, Ru (8-hydroxyquinoline)2 Cl, Ru C2-hydroxyquinoline)2 Cl Ru [dimethylglyoxime)4 Cl2 Ru (2,2'-bipyridine)2C1 K4Ru (CN)6.3H2O Ru (NH3)4 OH.Cl2 2H2O , and Ru (NO) (NO3)3. 6. The process of Claim 1 wherein the coordination compound of iron is selected from the group consisting of: Fe(CO)5 , Fe2(CO)9 , Fe(butadiene) (CO)3 , HgCl (cyclopentadienyl)2 Fe, H2Fe(CO)4 Fe(cyclohexadienyl)(CO)3, FeHg(CO)4 Fe CCO)4 Ctriphenylphosphine) , and Fe(CO)4 (triphenylphosphite).

Inventors: CLARK, ROGER THOMAS, GARDNER, DAVID MILTON
Applicants: PENNWALT CORPORATION
Application year: 1981
Main classification: C07C85
IPC codes: C07C211, C07D295, B01J23, B01J31, C07B61, C07C67, C07C209, B01J27