Abstract: The invention relates to compositions, containing (A) organopolysiloxanes, which have Si-bound hydroxy groups, (B) organopolysiloxanes, which have Si-bound hydrogen atoms, (C) platinum catalysts, (D) reinforcing fillers, (E) optionally non-reinforcing fillers, and (F) optionally inhibitors, which delay a platinum-catalyzed reaction of Si-bound hydroxy groups and Si-bound hydrogen atoms at room temperature, with the proviso that the organopolysiloxanes (A) have viscosities of 500 to 100,000,000 mPa·s at 25° C.

Abstract: The object of the invention is a method for the production of foams on silicon basis from polymer mixtures (A) containing silicon, wherein at least one compound (V) is used that contributes to the formation of the polymer network, and which carries at least one alkoxy silyl group of the general formula [1a], [1b], or [1c] ?Si—O—(R1)(R2)(R3) [1a], ?Si(R5)—O—C(R1)(R2)(R3) [1b], ?Si—O—C(O)—U [1c], from which upon curing of the polymer mixtures (A) at least one molecule (XY) is split which is gaseous during processing and causes the formation of foam in the polymer mixture (A), and a catalyst (K) selected from a Brönstedt acid, Brönstedt base, Lewis acid, and Lewis base, where R1, R2, R3, R5, and U have the meanings as stated in claim 1, and where polymer mixtures (A) which form SiO2 during the cross-linking process are excluded.

Abstract: The invention relates to compositions, containing (A) organopolysiloxanes, which have Si-bound hydroxy groups, (B) organopolysiloxanes, which have Si-bound hydrogen atoms, (C) platinum catalysts, (D) reinforcing fillers, (E) optionally non-reinforcing fillers, and (F) optionally inhibitors, which delay a platinum-catalyzed reaction of Si-bound hydroxy groups and Si-bound hydrogen atoms at room temperature, with the proviso that the organopolysiloxanes (A) have viscosities of 500 to 100,000,000 mPa·s at 25° C.

Abstract: The object of the invention is a method for the production of foams on silicon basis from polymer mixtures (A) containing silicon, wherein at least one compound (V) is used that contributes to the formation of the polymer network, and which carries at least one alkoxy silyl group of the general formula [1a], [1b], or [1c] ?Si—O—(R1)(R2)(R3) [1a], ?Si(R5)—O—C(R1)(R2)(R3) [1b], ?Si—O—C(O)—U [1c], from which upon curing of the polymer mixtures (A) at least one molecule (XY) is split which is gaseous during processing and causes the formation of foam in the polymer mixture (A), and a catalyst (K) selected from a Brönstedt acid, Brönstedt base, Lewis acid, and Lewis base, where R1, R2, R3, R5, and U have the meanings as stated in claim 1, and where polymer mixtures (A) which form SiO2 during the cross-linking process are excluded.

Abstract: Chiral secondary alcohols may be produced enzymatically in high space-time yields while minimizing enzyme use, by reducing a keto compound in an aqueous reaction medium containing water, reducing agent, alcohol dehydrogenase and coenzyme, extracting the secondary alcohol formed by means of a further phase containing a water-immiscible organic solvent, and removing the phase used for extraction and reusing the aqueous reaction medium in step a).

Abstract: A new class of C2-symmetric biaryldiphosphines comprising a fused ring system (dioxacycle) which has at least seven ring atoms and can be varied synthetically. The biaryldiphosphines can be used as ligands for preparing metal complexes useful as catalysts in organic synthesis, and the dioxacycles can be varied to optimize reaction with specific substrates.