| Patent Number |
Title Of Patent |
Date Issued |
| 7368610 |
Preparation of xylylenediamine (XDA) |
May 6, 2008 |
| A process for preparing xylylenediamine, comprising the steps of ammoxidizing xylene to phthalonitrile and hydrogenating the phthalonitrile, which comprises contacting the vaporous product of the ammoxidation stage directly with a liquid organic solvent or with molten phthalonitrile |
| 7339080 |
Method for the production of diaminoxylene by continuous hydrogenation of liquid phthalonitrile |
March 4, 2008 |
| A process for preparing xylylenediamine by continuously hydrogenating liquid phthalonitrile over a heterogeneous catalyst in the presence of liquid ammonia in a reactor, which comprises mixing a stream of a phthalonitrile melt in liquid form by means of a mixer unit with a stream of |
| 7323598 |
Preparation of xylylenediamine (XDA) |
January 29, 2008 |
| A process for preparing xylylenediamine, comprising the steps ofammoxidizing xylene to phthalonitrile by contacting the vaporous product of this ammoxidation stage directly with a liquid organic solvent (quench),removing products having a boiling point higher than phthalonitrile (hig |
| 7323597 |
Method for the production of diaminoxylene by continuous hydrogenation of liquid phthalonitrile |
January 29, 2008 |
| A process for preparing xylylenediamine by continuously hydrogenating liquid phthalonitrile over a heterogeneous catalyst in the presence of liquid ammonia in a reactor, in which a portion of the reactor effluent is recycled as a liquid circulation stream continuously to the reactor |
| 6673920 |
Method for the production of N-alkenyl-amides |
January 6, 2004 |
| A process for preparing N-alkenyl-amides by reacting the corresponding NH-amides with acetylenes in the liquid phase in the presence of basic alkali metal compounds and of a cocatalyst comprises using as the cocatalyst diols of the general formula (I) ##STR1## where X is branch |
| 6649717 |
Stabilized composition of O- and N-vinyl compounds and use of ammonium salts as stabilizers |
November 18, 2003 |
| The invention encompasses a composition of vinyl compounds, comprising a) at least one polymerizable compound which has at least one O-vinyl group or one N-vinyl group, and b) at least one ammonium salt of the formula (I) ##STR1##where R is NH.sub.2, O.sup.- NH.sub.4.sup.+, C.sub.1 -C. |
| 6624303 |
Method for producing N-alkenyl amides |
September 23, 2003 |
| A process for preparing N-alkenyl-amides by reacting the corresponding NH-amides with acetylenes in the liquid phase in the presence of basic alkali metal compounds and of a cocatalyst comprises using as the cocatalyst compounds of the general formulae (Ia) and/or (Ib)where n is 1, 2 or |
| 6479687 |
Preparation of vinylphosphonic acid compounds |
November 12, 2002 |
| A process for preparing vinylphosphonic acid compounds of the formula (I) ##STR1##where R.sup.1 and R.sup.2 are, independently, H, C.sub.1-16 -alkyl, C.sub.6-12 -aryl, C.sub.7-12 -alkaryl or C.sub.7-12 -aralkyl, it being possible for the organic radicals to be substituted by one or more |
| 6414176 |
Preparation of vinylsilanes |
July 2, 2002 |
| In the process for the preparation of vinylsilanes by reacting acetylenic hydrocarbons with silanes which have at least one silicon-bonded hydrogen atom in the liquid phase in the presence of a catalyst, the silane is added to the liquid phase. In particular, the reaction is carried out |
| 6369282 |
Preparation of alkynediols |
April 9, 2002 |
| The process for preparing alkynediols of the formula (I)whereR.sup.1, R.sup.2 are each independently H, or a C.sub.1-20 -hydrocarbon radical which may be substituted by one or more C.sub.1-6 -alkyls and/or be interrupted by nonadjacent heteroatoms and/or contain C--C double or triple bon |
| 6350714 |
Method for preparing a catalyst and catalysts prepared accordingly |
February 26, 2002 |
| The present invention relates to a process for preparing a catalyst by activating a catalytic composition which comprisesa) at least one metal of group IB or IIB or a compound thereof,b) where appropriate a carrierwhich comprises treating the composition with an alkyne of the general formula |
| 6313347 |
Method for producing vinyl oxime-ethers |
November 6, 2001 |
| In the process for the preparation of vinyloxime ethers of the formula I ##STR1##by reacting an oxime with an alkynewhereR.sup.1 and R.sup.2 are identical or different and are alkyl or aryl radicals,R.sup.3 is hydrogen, an alkyl or aryl radical, andR.sup.4 is a radical having the meaning of |
| 6153786 |
Method for producing 2-alkynoic acid esters |
November 28, 2000 |
| A process for preparing 2-alkynoic esters of the general formula (I),in which R.sup.1 and R.sup.2 independently are C.sub.1-16 -alkyl, C.sub.6-12 -aryl, C.sub.7-12 -aralkyl or C.sub.7-12 -alkylaryl radicals, and R.sup.2 can also be hydrogen,by reacting a chloroformate of the general formula |
| 6143850 |
Lipophilic polymeric UV absorbers |
November 7, 2000 |
| Polymeric UV absorbers based on the units shown in the schematized formula I ##STR1## where the sequence of the units is arbitrary, the sum of a+b+c+d=100 anda is a value from 5 to 95,b is a value from 0 to 70,c is a value from 5 to 95,d is a value from 0 to 70and the radicals R have the |
| 6107487 |
Methine and azamethine dyes based on 5-membered heterocycles with a trifluoromethyl group |
August 22, 2000 |
| Dyes of the formulawhereX is nitrogen or CH,Q is a 5- or 6-membered carbocyclic or heterocyclic radical and Het is a radical of the formula ##STR1## where Y is oxygen, sulfur, imino, C.sub.1 -C.sub.4 -alkylimino, substituted or unsubstituted phenylimino or the radical of an acidic-C |
| 5962700 |
Butyrolactone-preparation process |
October 5, 1999 |
| A process for the preparation of butyrolactones of the formula I ##STR1## where the substituents R.sup.1 and R.sup.2 are hydrogen, alkyl or hydroxyalkyl groups, or aryl and trialkylsilyl groups, if appropriate carrying inert: substituents, is described in which an alkyne of the f |
| 5840986 |
Preparation with heterogeneous catalysis of N-alkyl-substituted aminoalkynes |
November 24, 1998 |
| A process for preparing N-alkyl-substituted aminoalkynes by reacting an alkyne with a carbonyl compound and an amine with heterogeneous catalysis in which an unsupported copper acetylide derived from malachite is used as the catalyst. The N-alkyl-substituted aminoalkyne have a wide varie |
| 5831129 |
Preparation, with heterogeneous catalysis, of N-hydroxyalkyl-substituted aminoalkynes |
November 3, 1998 |
| N-Hydroxyalkyl-substituted aminoalkynes of the formula I ##STR1## are prepared by reacting an alkyne with a 1-oxa-3-azaheterocyclo-alkane in a reaction with heterogeneous catalysis by a catalyst which comprises a compound of a metal of the first or second sub-group. |
| 5808160 |
Preparation of hydroxy-alkyl-substituted aminoalkynes with heterogenous catalysis |
September 15, 1998 |
| Hydroxyalkyl-substituted aminoalkynes of the general formula I ##STR1## where at least one of the substituents R.sup.1, R.sup.4 or R.sup.5 is hydroxyalkyl are prepared in a reaction with heterogeneous catalysis. |
