摘要:
Verfahren zur Herstellung einer chiralen Verbindung der Formel (I),
wobei R gleich oder verschieden ist und H, oder organischer Rest bedeutet, bei dem eine Biotransformationszusammensetzung, umfassend eine Verbindung der Formel (II),
wobei R die genannte Bedeutung hat, eine Oxidoreduktase, einen Redox-Cofaktor und ein Cosubstrat, zur Reaktion gebracht wird, wobei die chirale Verbindung der Formel (I) entsteht und nachfolgend isoliert wird.
摘要:
The invention relates to aminomethyl functional alkoxysilanes (A1) of general formula [1], wherein R1 represents a hydrocarbon radical which is optionally substituted by halogen, R2 represents an alkyl radical having 1-6 carbon atoms or an O-oxaalkyl-alkyl radical having a total of between 2-10 carbon atoms, R3 represents an optionally substituted hydrocarbon radical, R4 represents an optionally substituted hydrocarbon radical and a has a value of either 0, 1 or 2. The invention also relates to prepolymers produced from said silanes and to materials containing said prepolymers.
摘要:
The invention relates to a method for producing of R-α-lipoic acid by means of fermentation, characterized in that a cell, which has an activity of the lipoyl protein ligase B that is higher than that of a wild type strain and, at the same time, has a concentration of a lipoylatable polypeptide higher than that of the wild type, is cultured in a culture medium, whereby the cell secretes enantiomer-pure R-α-lipoic acid into the culture medium, and the enantiomer-pure R-α-lipoic acid is separated out from the culture medium.
摘要:
The invention relates to prepolymers (A) with terminal groups of general formula (1) -SiR1a(OR2)3-a, whereby R1 represents an optionally halogen-substituted alkyl, cycloalkyl, alkenyl or Aryl radical having 1-10 carbon atoms; R2 represents an alkyl radical having 1-6 carbon atoms or a ω-oxaalkyl-alkyl radical having, in total, 2-10 carbon atoms; a is a number from 0 to 2, whereby the prepolymers (A) can be obtained by reacting: 1) polyol (A1) having an average molecular weight Mn ranging from 1000 to 25000; 2) low-molecular alcohol (A2) having at least two hydroxyl groups per molecule and a molecular weight ranging from 62 to 300; 3) di- or polyisocyanate (A3), and; 4) alkoxysilane (A4), which have an isocyanate group or an isocyanate-reactive group, whereby the low-molecular alcohol (A2) and the polyol (A1) are used in a molar ratio ranging from 0.3: 1 to 7: 1.
摘要:
The invention relates to foaming mixtures (M), comprising A) isocyanate-free prepolymers (A) with alkoxysilane end groups which have silane end groups of the general formula [2]: -SiR3z(OR4)3-z, in which R3 = an alkyl, cycloalkyl, alkenyl or aryl group with 1-10 carbon atoms, R4 = an alkyl group with 1-2 carbon atoms or a ?- oxaalkyl-alkyl group with a total of 2-10 carbon atoms and z = 0 or 1, (B) propellants and (C) solvents with a boiling point of at least 30 °C.
摘要:
The invention relates to a polymerisable mixture (P) containing A) monomers or oligomers (A), each of said monomers or oligomers (A) comprising at least two polymerisable functional groups which are selected from (meth)acrylate ester groups, epoxy groups and vinyl ether groups, B) liquid-crystalline monomers or oligomers (B), each of said monomers or oligomers (B) comprising at least one mesogen group having an aromatic double ring structure and just one polymerisable functional group which is selected from (meth)acrylate ester groups, epoxy groups and vinyl ether groups, and C) between 1 and less than 50 wt. %, in relation to the polymerisable mixture, of a monomer (C) comprising at least one mesogen group having an aromatic double ring structure and no groups which can react with the polymerisable functional groups of the monomers or oligomers (A) and (B).
摘要:
The invention relates to foamable preparations comprised of the following constituents: (A) linear or branched organopolysiloxanes whose chain ends are terminated up to at least 95 % with aminoalkyl groups or hydroxyalkyl groups of general formula (1) -O-SiR12O-SiR22-R3-Z that can be produced by reacting linear or branched organopolysiloxanes, which have terminal groups of general formula (2) -O-SiR12-OH, with organosilicon compounds, which are composed of structural elements of general formula (3) - [SiR22-R3-Y-]k, whereby R1, R2, R3, Z, Y and k have the meanings as cited in Claim No. 1; (B) di- or polyisocyanates, and; (C) expanding agents.
摘要:
The invention relates to moisture cross-linking compositions containing (A) 100 parts per weight of a silane-terminated polydiorganosiloxane-urea/urethane copolymer of general formula (1), and (B) between 0.1 and 20 parts per weight of silane of general formula (3): Φ-(CH2)e-Si(R2)3-f(CH3)f, in which R, X, A, Y, D, B, W, n, a, b, c, d, Φ, R2, e and f are defined as per claim 1.