Patents by Inventor Joachim Rheinheimer

Joachim Rheinheimer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20080161187
    Abstract: Biphenylsulfonamides of the formula (I) and the N-oxides and the agriculturally acceptable salts and the veterinarily acceptable salts of the compounds I, a process for preparing these compounds, compositions comprising them, their use for controlling phytopathogenic harmful fungi and harmful arthropodes, a method for combating arthropodal pests, a method for protecting crops from attack or infestation of arthropodal pests, a method for protecting seed and non-living materials from infestation by arthropodal pests, a method for protecting non-living materials from attack or infestation by arthropodal pests and seed comprising the compounds I.
    Type: Application
    Filed: March 15, 2006
    Publication date: July 3, 2008
    Applicant: BASF Aktiengesellschaft
    Inventors: Wassilios Grammenos, Joachim Rheinheimer, Jan Klaas Lohmann, Thomas Grote, Michael Puhl, Christopher Koradin, Ernst Baumann, Wolfgang Von Deyn, Jurgen Langewald, Norbert Gotz, Deborah L. Culbertson, Douglas D. Anspaugh, Hassan Oloumi-Sadeghi, Henry Van Tuyl Cotter, David G. Kuhn
  • Publication number: 20080153707
    Abstract: The present invention relates to pyrazolecarboxanilides I in which the variables are as defined below: n is zero or 2; m is 2 or 3; X1 is fluorine or chlorine; X2 is halogen; Y is CN, NO2, C1-C4-alkyl, C1-C4-haloalkyl, methoxy or methylthio; p is zero or 1; R1 is fluorine, chlorine, bromine, C1-C4-alkyl or C1-C4-haloalkyl; R2 is hydrogen or halogen; R3 is hydrogen, methyl or ethyl; W is O or S; with the proviso that, if a) W?O, R1=methyl and R3 is hydrogen, R2 is not fluorine, or b) W?O, n=0, m=2, p=0, R2 and R3 are hydrogen, R1 is not trifluoromethyl or difluoromethyl, to processes for preparing these compounds, to compositions comprising them and to methods for using them for controlling harmful fungi.
    Type: Application
    Filed: February 15, 2006
    Publication date: June 26, 2008
    Applicant: BASF Akitengesellschaft
    Inventors: Markus Gewehr, Jochen Dietz, Thomas Grote, Carsten Blettner, Wassilios Grammenos, Udo Hunger, Bernd Muller, Frank Schieweck, Anja Schwogler, Jan Klaas Lohmann, Joachim Rheinheimer, Peter Schafer, Siegfried Strathmann, Reinhard Stierl
  • Publication number: 20080146593
    Abstract: The present invention relates to substituted 5-phenyl pyrimidines I, which carry a radical X in the 4-position of the pyrimidine ring, a radical Y in the 6-position of the pyrimidine ring, the radical X denoting a group of the formula NR1R2, OR1a or SR1a, in which R1, R2, independently of each other, denote hydrogen, C1-C10-alkyl, C2-C6-alkenyl, C2-C6-alkynyl, C1-C10-haloalkyl, C3-C8-cycloalkyl, C3-C8-halocycloalkyl, phenyl, or 5- or 6-membered heteroaryl or 5- or 6-membered heterocyclyl, containing 1, 2, 3 or 4 nitrogen atoms or 1, 2 or 3 nitrogen atoms and one sulfur or oxygen atom as ring members, which radicals may be unsubstituted or may carry 1, 2, 3 or 4 radicals Ra1; or the radical NR1R2 may also form a 5- or 6-membered optionally substituted heterocyclic ring, containing 1, 2, 3 or 4 nitrogen atoms or 1, 2 or 3 nitrogen atoms and one sulfur or oxygen atom as ring members, which are non-adjacent to the nitrogen of NR1R2, in which two adjacent C atoms or one N atom and one adjacent C atom can be linked
    Type: Application
    Filed: January 30, 2006
    Publication date: June 19, 2008
    Applicant: Basf Aktiengesellschaft
    Inventors: Joachim Rheinheimer, Thomas Grote, Bernd Muller, Barbara Nave, Frank Schieweck, Anja Schwogler, Thorsten Jabs, Carsten Blettner
  • Patent number: 7388018
    Abstract: Sulfonamides of the formula I where the substituents are as follows: R1 is hydrogen, alkyl, alkoxy, alkenyl or alkynyl; and R2, R3, R4, R5 are hydrogen, halogen, alkyl, alkoxy or halomethyl; R2 and R3 together may also form a phenyl, cyclopentyl or cyclohexyl ring, it being possible for these rings to carry two groups R2, and R3, R2, R3, are hydrogen, halogen, alkyl, alkoxy or halomethyl; in case a), if R2, R3, R4 and R5 are hydrogen: X is phenyl substituted by a group —C(R6)?NOR7, where R6 is alkyl and R7 is alkyl, benzyl, alkenyl, haloalkyl, haloalkenyl, alkynyl or haloalkynyl; and in case b), if at least one of the groups R2, R3, R4 and R5 is not hydrogen: X is phenyl, naphthyl or a five- or six-membered saturated, or partially unsaturated or aromatic heterocycle which is attached via a carbon atom and contains one to four heteroatoms from the group consisting of O, N and S, where X may be substituted according to the description; Processes for preparing these compounds, compositions comprisi
    Type: Grant
    Filed: September 10, 2004
    Date of Patent: June 17, 2008
    Assignee: BASF Aktiengesellschaft
    Inventors: Wassilios Grammenos, Carsten Blettner, Bernd Müller, Markus Gewehr, Jordi Tormo i Blasco, Thomas Grote, Joachim Rheinheimer, Peter Schäfer, Frank Schieweck, Anja Schwögler, Oliver Wagner, Norbert Götz, Siegfried Strathmann, Ulrich Schöfl, Maria Scherer, Reinhard Stierl
  • Publication number: 20080139581
    Abstract: 2-Substituted 7-aminoazolopyrimidines of the formula I in which the substituents are as defined below: R1 is hydrogen, halogen, cyano, alkyl, haloalkyl, alkenyl, alkynyl, cycloalkyl, alkoxy, alkoxyalkyl, benzyloxyalkyl, alkoxyalkenyl or alkoxyalkynyl; R2 is hydrogen, halogen, cyano, alkyl, haloalkyl, alkenyl, alkynyl, cycloalkyl, alkoxy, alkoxyalkyl and alkylthioalkyl, where the carbon chains in R1 and/or R2 may be substituted according to the description; R3 is halogen, cyano, NRARB, hydroxyl, mercapto, alkyl, haloalkyl, cycloalkyl, alkoxy, alkylthio, cycloalkoxy, cycloalkylthio, carboxyl, formyl, alkylcarbonyl, alkoxycarbonyl, alkenyloxycarbonyl, alkynyloxycarbonyl, phenyl, phenoxy, phenylthio, benzyloxy, benzylthio, alkyl-S(O)m—; A is N and CRx; Rx is hydrogen or one of the groups mentioned under R3; processes and intermediates for preparing these compounds, compositions comprising them and their use for controlling phytopathogenic harmful fungi.
    Type: Application
    Filed: March 2, 2006
    Publication date: June 12, 2008
    Applicant: BASF Aktiengesellschaft
    Inventors: Wassilios Grammenos, Thomas Grote, Udo Hunger, Jan Klaas Lohmann, Bern Muller, Joachim Rheinheimer, Peter Schafer, Anja Schwogler, Michael Rack
  • Publication number: 20080132522
    Abstract: The invention relates to 2-substituted pyrimidines of the formula I in which the index n and the substituents R1 to R4, B and L are as defined in the description and Y is a group —O— or —S—, and to processes for their preparation, pesticidal compositions and methods for controlling harmful fungi and animal pests using the compounds according to the invention.
    Type: Application
    Filed: July 12, 2005
    Publication date: June 5, 2008
    Applicant: BASF Aktiengesellschaft
    Inventors: Joachim Rheinheimer, Frank Schieweck, Thomas Grote, Carsten Blettner, Anja Schwogler, Markus Gewehr, Wassilios Grammenos, Udo Hunger, Bernd Muller, Peter Schafer, Jochen Dietz, John-Bryan Speakman, Maria Scherer, Siegfried Strathmann, Ulrich Schofl, Reinhard Stierl
  • Publication number: 20080125445
    Abstract: 5,6-Dialkyl-7-aminoazolopyrimidines of the formula I in which the substituents are as defined below: R1 is alkyl or alkoxyalkyl, R2 is alkyl, where R1 and/or R2 may be substituted according to the description, A is N or CH, and R3 is CH3 and, if A is CH, additionally hydrogen; processes and intermediates for preparing these compounds, compositions comprising them and their use for controlling phytopathogenic harmful fungi.
    Type: Application
    Filed: March 1, 2006
    Publication date: May 29, 2008
    Applicant: BASF Aktiengesellschaft
    Inventors: Peter Schafer, Udo Hunger, Maria Scherer, Harald Kohle, Helmut Schiffer, Thomas Grote, Jochen Dietz, Wassilios Grammenos, Jan Klaas Lohmann, Bernd Muller, Joachim Rheinheimer, Frank Schieweck, Anja Schwogler
  • Publication number: 20080119493
    Abstract: The invention relates to 5,6-dialkyl-7-amino-triazolopyrimidines of formula (I), in which the substituents are defined as follows: R1 represents alkyl, alkoxyalkyl, alkenyl or alkynyl; R2 represents alkyl, alkoxyalkyl, alkenyl or alkynyl, R1 and/or R2 being substituted according to the description. The invention also relates to a method for producing said compounds, to agents containing the latter and to their use for controlling plant-pathogenic fungi.
    Type: Application
    Filed: March 8, 2005
    Publication date: May 22, 2008
    Applicant: BASF Aktiengesellschaft
    Inventors: Jordi Tormo i Blasco, Carsten Blettner, Bernd Muller, Markus Gewehr, Wassilios Grammenos, Thomas Grote, Joachim Rheinheimer, Peter Schafer, Frank Schieweck, Anja Schwogler, Oliver Wagner, Matthias Niedenbruck, Maria Scherer, Siegfried Strathmann, Ulrich Schofl, Reinhard Stierl, Udo Hunger
  • Patent number: 7375108
    Abstract: The invention relates to 2-substituted pyrimidines of the formula I in which the index n and the substituents R1 to R3 and L are as defined in the description and R4 corresponds to one of the formulae in which Ra, X and Rb are as defined in the description; and also to processes for preparing these compounds, to pesticidal compositions comprising these compounds and to their use as pesticides.
    Type: Grant
    Filed: July 15, 2004
    Date of Patent: May 20, 2008
    Assignee: BASF Aktiengesellschaft
    Inventors: Anja Schwögler, Markus Gewehr, Bernd Müller, Thomas Grote, Wassilios Grammenos, Jordi Tormo i Blasco, Andreas Gypser, Joachim Rheinheimer, Carsten Blettner, Peter Schäfer, Frank Schieweck, Oliver Wagner, Reinhard Stierl, Ulrich Schöfl, Siegfried Strathmann, Maria Scherer
  • Publication number: 20080108686
    Abstract: The present invention relates to N-(ortho-phenyl)-1-methyl-3-difluoromethylpyrazole-4-carboxanilides of the formula I in which the substituents are as defined below: R1 and R2 independently of one another are halogen, C1-C6-alkyl, C1-C6-haloalkyl, cyano, nitro, methoxy, trifluoromethoxy or difluoromethoxy.
    Type: Application
    Filed: June 16, 2005
    Publication date: May 8, 2008
    Applicant: BASF Aktiengesellschaft
    Inventors: Markus Gewehr, Bernd Muller, Thomas Grote, Wassilios Grammenos, Anja Schwogler, Joachim Rheinheimer, Carten Blettner, Peter Schafer, Frank Schieweck, Oliver Wagner, Frank Werner, Jan Rether, Siegfried Strathmann, Reinhard Stierl, Maria Scherer
  • Publication number: 20080076785
    Abstract: The invention relates to 7-aminomethyl-1,2,4-triazolo[1,5-a]pyrimidine compounds of general formula (I) and the agriculturally compatible salts of said compounds.
    Type: Application
    Filed: September 27, 2005
    Publication date: March 27, 2008
    Inventors: Carsten Blettner, Jordi Tormo i Blasco, Bernd Muller, Markus Gewehr, Wassilios Grammenos, Thomas Grote, Udo Hunger, Joachim Rheinheimer, Peter Schafer, Frank Schieweck, Anja Schwogler, Oliver Wagner, John-Bryan Speakman, Thorsten Jabs, Siegfried Strathmann, Ulrich Schofl, Maria Scherer, Reinhard Stierl
  • Publication number: 20080058208
    Abstract: The invention relates to 5,6-cycloalkyl-7-aminotriazolopyrimidines of formula (I), where X=alkylene or alkenylene, whereby the carbon chain can be interrupted by one or two heteroatoms selected from S, O or NR1, R1?H, alkyl or C(?O)alkyl, L=halogen, cyano, nitro, alkyl, haloalkyl, alkoxy, haloalkoxy, alkenyl, alkinyl or NR2R3; R2,R3=each one of the groups given for R1 and m=a whole number from 0 to 5, whereby the aliphatic groups can be substituted by one to three of the following groups: halogen, cyano, nitro, hydroxy, alkoxy, alkylthio, or NRaRb, where Ra, Rb?H or alkyl in which the carbon chains can be halogenated. The invention further relates to methods for production of said compounds, agents comprising the same and use thereof for the prevention of fungal pests harmful to plants.
    Type: Application
    Filed: March 26, 2005
    Publication date: March 6, 2008
    Applicant: BASF Aktiengesellschaft
    Inventors: Jordi Tormo i Blasco, Carsten Blettner, Bernd Muller, Markus Gewehr, Wassilios Grammenos, Thomas Grote, Joachim Rheinheimer, Peter Schafer, Frank Schieweck, Anja Schwogler, Oliver Wagner, Matthias Niedenbruck, Maria Scherer, Siegfried Strathmann, Ulrich Schofl, Reinhard Stierl
  • Publication number: 20080039319
    Abstract: The invention relates to fungicidal mixtures containing in the form of active components 1) 5-methyl-7-amino-triazolopyrimidine of formula (I), wherein R1 is alkyl, halogenalkyl, alkenyl or cyclopentyl, R2 is hydrogen or alkyl, R1 and R2 together with the nitrogen atom to which they are bound may form a piperidinyl cycle substitutable by a methyl group, L1 is fluorine or chlorine, L2, L3 are independently from each other hydrogen, fluorine or chlorine and 2) at least one type of active substance selected from groups A) azoles, B) strobilurins, C) acyl alanines, D) amine derivatives, E) anilinopyrimidines; F) dicarboximides; G) cinnamic acid amides and analogues thereof, H) antibiotics, K) dithiocarbamates, L) heterocyclic compounds, M) sulphur and copper fungicides, N) nitrophenyl derivatives, O) phenylpyrroles, P) sulfenic acid derivatives, Q) other fungicides and R) growth retardants according to the descriptions, wherein said mixtures contain the compounds in a synergically efficient amount.
    Type: Application
    Filed: May 11, 2005
    Publication date: February 14, 2008
    Applicant: Basf Aktiengesellschaft
    Inventors: Carsten Blettner, Markus Gewehr, Wassilios Grammenos, Thomas Grote, Udo Hunger, Bernd Muller, Matthias Niedenbruck, Joachim Rheinheimer, Peter Schafer, Frank Schieweck, Anja Schwogler, Oliver Wagner, Barbara Nave, Maria Scherer, Siegfried Strathmann, Ulrich Schofl, Reinhard Stierl
  • Publication number: 20080039327
    Abstract: Benzoyl derivatives of the formula I where the variables have the following meanings: R1, R2 are hydrogen, nitro, halogen, cyano, alkyl, haloalkyl, alkoxy, haloalkoxy, alkylthio, haloalkylthio, alkylsulfinyl, haloalkylsulfinyl, alkylsulfonyl or C1-C6-haloalkylsulfonyl; R3 is hydrogen, halogen or alkyl; R4, R5 are hydrogen, halogen, cyano, nitro, alkyl, alkoxy, alkylthio, dialkylamino, phenyl or carbonyl, it being possible for the 6 last-mentioned radicals to be substituted; X is O, S, NR9, CO or CR10R11; Y is O, S, NR12, CO or CR13R14; R15 is pyrazole which is unsubstituted or substituted, linked in the 4-position and has attached to it in the 5-position a hydroxyl or sulfonyloxy radical; and the agriculturally useful salts thereof; processes and intermediates for the preparation of the 3-heterocyclyl-substituted benzoyl derivatives; compositions comprising them; and the use of these derivatives or compositions comprising them for controlling undesirable plants.
    Type: Application
    Filed: April 25, 2007
    Publication date: February 14, 2008
    Inventors: Wolfgang Deyn, Regina Hill, Uwe Kardorff, Ernst Baumann, Stefan Engel, Guido Mayer, Matthias Witschel, Michael Rack, Norbert Gotz, Joachim Gebhardt, Ulf MiBlitz, Helmut Walter, Karl-Otto Westphalen, Martina Otten, Joachim Rheinheimer
  • Publication number: 20080032889
    Abstract: Substituted triazolopyrimidines of the formula I in which the substituents are as defined below: R1 is alkyl, halocycloalkyl, alkenyl, cycloalkyl, cycloalkenyl, halocycloalkenyl, alkynyl, haloalkynyl or naphthyl, or a five- or six-membered saturated, partially unsaturated or aromatic heterocycle comprising one to four heteroatoms from the group consisting of O, N and S, R2 is hydrogen, alkyl or one of the groups mentioned under R1; R1 and/or R2 may carry one to four identical or different groups Ra: Ra is chlorine, bromine, iodine, cyano, nitro, hydroxyl, alkyl, alkylcarbonyl, cycloalkyl, alkoxy, haloalkoxy, alkoxycarbonyl, alkylthio, alkylamino, dialkyl-amino, alkenyl, cycloalkenyl, alkenyloxy, haloalkenyloxy, alkynyl, halo-alkynyl, alkynyloxy, haloalkynyloxy, cycloalkoxy, cycloalkenyloxy, oxyalkylenoxy, naphthyl, a five- to ten-membered saturated, partially unsaturated or aromatic heterocycle comprising one to four heteroatoms from the group consisting of O, N and S, where these aliphatic, alicycl
    Type: Application
    Filed: June 14, 2005
    Publication date: February 7, 2008
    Applicant: BASF AKTIENGESELLSCHAFT
    Inventors: Carsten Blettner, Markus Gewehr, Wassilios Grammenos, Thomas Grote, Udo Hunger, Bernd Muller, Matthias Niedenbruck, Joachim Rheinheimer, Peter Schafer, Frank Schieweck, Anja Schwogler, Oliver Wagner, Barbara Nave, Maria Scherer, Siegfried Strathmann, Ulrich Schofl, Reinhard Stierl
  • Publication number: 20080027085
    Abstract: The invention relates to 2-(pyridin-2-yl)-pyrimidine compounds of general formula (I) and their use for controlling pathogenic fungi and as plant protection products that, as an active constituent, contain compounds of this type, whereby: k represents 0, 1, 2, 3; m represents 0, 1, 2, 3, 4 or 5; n represents 1, 2, 3, 4 or 5; R1, independent of one another, represents halogen, OH, CN, NO2, C1-C4 alkyl, C1-C4 alkyl halide, C1-C4 alkoxy, C1-C4 alkoxy halide, C2-C4 alkenyl, C2-C4 alkynyl, C3-C8 cycloalkyl, C1-C4 alkoxy-C1-C4 alkyl, amino, phenoxy, which is optionally substituted by halogen or C1-C4 alkyl, NHR, NR2, C(Ra)?N—ORb, S(?O)pA1 or C(?O)A2, or two radicals R1 bound to adjacent carbon atoms can, together, also represent a group —O-Alk-O—, wherein Alk represents a linear or branched C1-C4 alkylene, and 1, 2, 3 or 4 hydrogen atoms can also be replaced by halogen; R2 represents C1-C4 alkyl halide, C1-C4 alkoxy, C1-C4 alkoxy halide, hydroxy, halogen, CN or NO2; whereby R2 can also represent hydrogen or C1-C4 a
    Type: Application
    Filed: July 22, 2005
    Publication date: January 31, 2008
    Applicant: BASF AKTIENGESELLSCHAFT
    Inventors: Wassilios Grammenos, Thomas Grote, Carsten Blettner, Markus Gewehr, Udo Hunger, Bernd Muller, Joachim Rheinheimer, Peter Schafer, Frank Schieweck, Anja Schwogler, Ulrich Schofl, Harald Kohle, Siegfried Strathmann, Maria Scherer, Reinhard Stierl, Jan Rether
  • Patent number: 7320975
    Abstract: The invention relates to 2-(2-pyridyl)-5-phenyl-6-aminopyrimidines of formula I, wherein the substitutes and the index have the following meaning: R1 represents halogen, hydroxy, hyano, hxo, nitro, amino, mercapto, alkyl, halogenalkyl, alkenyl, alkinyl, cycloalkyl, alkoxy, halogenalkoxy, carboxyl, alkoxycarbonyl, carbamoyl, alkylaminocarbonyl, dialkylamincarbonyl, morpholinocarbonyl, pyrrolidinocarbonyl, alkylcarbonylamino, alkylamino.
    Type: Grant
    Filed: February 6, 2003
    Date of Patent: January 22, 2008
    Assignee: BASF Aktiengesellschaft
    Inventors: Frank Schieweck, Jordi Tormo i Blasco, Thomas Grote, Andreas Gypser, Bernd Müller, Joachim Rheinheimer, Ingo Rose, Peter Schäfer, Wassilios Grammenos, Markus Gewehr, Anja Schwögler, Carsten Blettner, Eberhard Ammermann, Siegfried Strathmann, Gisela Lorenz, Reinhard Stierl
  • Patent number: 7317015
    Abstract: The invention relates to 2-substituted pyrimidines of the formula I in which the index n and these substituents R1, R2 and R3 are as defined in the description and R4 is as defined below: R4 corresponds to one of the formulae where Ra is hydrogen, C1-C6-alkyl, C2-C8-alkenyl, C2-C8-alkynyl, C3-C6-cycloalkyl or C1-C4-alkoxy and R5 is hydrogen, C1-C6-alkyl, C2-C6-alkenyl, C2-C6-alkynyl, C1-C4-alkyloxy-C1-C2-alkyl, phenyl-C1-C2-alkyl or phenyloxy-C1-C2-alkyl, to processes for preparing these compounds, to compositions comprising these compounds and to their use as pesticides.
    Type: Grant
    Filed: July 3, 2004
    Date of Patent: January 8, 2008
    Assignee: BASF Aktiengesellschaft
    Inventors: Frank Schieweck, Jordi Tormo i Blasco, Carsten Blettner, Bernd Müller, Markus Gewehr, Wassilios Grammenos, Thomas Grote, Andreas Gypser, Joachim Rheinheimer, Peter Schäfer, Anja Schwögler, Oliver Wagner, Siegfried Strathmann, Ulrich Schöfl, Maria Scherer, Reinhard Stierl
  • Publication number: 20070299115
    Abstract: The invention relates to (hetero)cyclyl(thio)carboxylic acid anilides of general formula (I) and to salts of said anilides that can be used for agricultural purposes for controlling pathogenic fungi.
    Type: Application
    Filed: September 5, 2005
    Publication date: December 27, 2007
    Applicant: BASF Aktiengesellschaft
    Inventors: Markus Gewehr, Bernd Muller, Thomas Grote, Wassilios Grammenos, Anja Shwogler, Joachim Rheinheimer, Carsten Blettner, Peter Schafer, Frank Schieweck, Oliver Wagner, Jan Rether, Siegfried Strathmann, Reinhard Stierl, Maria Scherer
  • Patent number: 7309802
    Abstract: A process is described for preparing isoxazoles of the formula I where the substituents are as defined below: R1 is hydrogen, C1-C6-alkyl, R2 is C1-C6-alkyl, R3, R4, R5 are hydrogen, C1-C6-alkyl, or R4 and R5 together form a bond, R6 is a heterocyclic ring, n is 0, 1 or 2; which comprises preparing an intermediate of the formula VI where R1, R3, R4 and R5 are as defined above, followed by halogenation, thiomethylation, oxidation and acylation to give compounds of the formula I. Also novel intermediates for preparing the compounds of the formula I and novel processes for preparing the intermediates are described.
    Type: Grant
    Filed: April 17, 2003
    Date of Patent: December 18, 2007
    Assignee: BASF Aktiengesellschaft
    Inventors: Joachim Rheinheimer, Wolfgang von Deyn, Joachim Gebhardt, Michael Rack, Rene Lochtman, Norbert Götz, Michael Keil, Matthias Witschel, Helmut Hagen, Ulf Misslitz, Ernst Baumann