@article{SchomburgLinkLinohetal.1988, author = {Schomburg, D. and Link, M. and Linoh, H. and Tacke, Reinhold}, title = {Molek{\"u}lstruktur der Akarizide Chlortrineophylstannan, Chlortris[(dimethylphenylsilyl)methyl]stannan und Trineophyl(1,2,4-triazol-1-yl)stannan-hemihydrat sowie des 2,5-Dimethyl-2,5-diphenylhexans (Bineophyl)}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-63840}, year = {1988}, abstract = {Die Kristall- und Molek{\"u}lstrukturen der Akarizide Chlortrineophylstannan (Ia), Chlortris[ ( dimethylphenylsilyl)methyl]stannan (tb) und Trineophyl(1,2,4-triazol-1- yl)stannan-hemihydrat (2a · 0.5H\(_2\)0) wurden durch Einkristall-R{\"o}ntgenstrukturanalysen bestimmt. Zu V ergleichszwecken wurde ausserdem die Struktur des 2,5-Dimethyl-2,5-diphenylhexans (Bineophyl, 4) untersucht. Die Kn{\"u}pfung von drei sehr raumerf{\"u}llenden N eophyl-Resten an ein Zinnatom f{\"u}hrt zu einer deutlichen Verzerrung der tetraedrischen Geometrie [ta: C-Sn-C 117.2°, C-Sn-Cl99.7°; 2a·0.5H20: C-Sn-C 116.9° (Mittelwert), C-Sn-N 100.2° (Mittelwert)]. Austausch der zentralen Kohlenstoffatome in den Neophyt-Substituenten von la durch Siliciumatome f{\"u}hrt zu einer Verringerung des Raumbedarfs und dadurch zu einer erkennbaren Angleichung an die tetraedrische Geometrie [lb: C-Sn-C 113.3° (Mittelwert), C-Sn-Cl 105.3° (Mittelwert)].}, subject = {Anorganische Chemie}, language = {de} } @article{SargeCammengaBeckeretal.1988, author = {Sarge, S. and Cammenga, H. K. and Becker, B. and Rohr-Aehle, R. and Tacke, Reinhold}, title = {Energetic and kinetic investigation of thermally induced molecular rearrangements of esters of (hydroxymethyl)hydridosilanes by DSC}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-63850}, year = {1988}, abstract = {No abstract available}, subject = {Anorganische Chemie}, language = {en} } @article{LambrechtGmelinRafeineretal.1988, author = {Lambrecht, G. and Gmelin, G. and Rafeiner, K. and Strohmann, C. and Tacke, Reinhold and Mutschler, E.}, title = {o-Methoxy-sila-hexocyclium: a new quaternary M\(_1\)-selective muscarinic antagonist}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-63862}, year = {1988}, abstract = {No abstract available}, subject = {Anorganische Chemie}, language = {en} } @article{LambrechtFeifelForthetal.1988, author = {Lambrecht, G. and Feifel, R. and Forth, B. and Strohmann, C. and Tacke, Reinhold and Mutschler, E.}, title = {p-Fluoro-hexahydro-sila-difenidol: the first M\(_{2\beta}\)-selective muscarinic antagonist}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-63872}, year = {1988}, abstract = {No abstract available}, subject = {Anorganische Chemie}, language = {en} } @article{TackeRohrAehle1988, author = {Tacke, Reinhold and Rohr-Aehle, R.}, title = {Ester des (Hydroxymethyl)[(trimethylsilyl)methyl]silans: Synthese und thermisch induzierte Umlagerung}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-63889}, year = {1988}, abstract = {Die Synthese des (Hydroxymethyl)[(trimethylsilyl)methyl]silans (3) sowie des hiervon abzuleitenden Acetats 4 und Chlorformiats 6 wird beschrieben. 4 und 6 unterliegen einer thermisch induzierten Umwandlung zu den difunktionellen Silanen 5 bzw. 8. Die Umwandlungen 4 -> 5 und 6 -> 8 erfolgen gem{\"a}ß einer Kinetik 1. Ordnung mit Halbwertszeiten von 10.0 bzw. 3.6 h (135 ° C, in C\(_6\)D\(_6\)).}, subject = {Anorganische Chemie}, language = {de} } @article{TackeBecker1988, author = {Tacke, Reinhold and Becker, B.}, title = {Synthese und Eigenschaften von (Hydroxymethyl)dimethylgerman und (Hydroxymethyl)diphenylgerman}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-63895}, year = {1988}, abstract = {Die (Hydroxymethyl)diorganylgermane (CH\(_3\))\(_2\)Ge(H)CH\(_2\)OH und (C\(_6\)H\(_5\))\(_2\)Ge(H)CH\(_2\)OH wurden - ausgehend von GeCl\(_4\) - durch eine jeweils vierstufige Synthese mit einer Gesamtausbeute von 15 bzw. 32\% dargestellt (GeCl\(_4\) ---+ Cl\(_3\)GeCH\(_2\)Cl -> R \(_2\)Ge(Cl)CH \(_2\)Cl ->R \(_2\)Ge(OAc)CH\(_2\)OAc--) R \(_2\)Ge(H)CH\(_2\)OH; R = CH\(_3\) bzw. C\(_6\)H\(_5\) ). Die chemische Reaktivit{\"a}t der Germane (CH\(_3\))\(_2\)Ge(H)CH\(_2\)OH und (C\(_6\)H\(_5\))\(_2\)Ge(H)CH\(_2\)OH wird durch deren Ge-H- und 0-H-Bindung bestimmt.}, subject = {Anorganische Chemie}, language = {de} } @article{SyldatkStoffregenWuttkeetal.1988, author = {Syldatk, C. and Stoffregen, A. and Wuttke, F. and Tacke, Reinhold}, title = {Enantioselective reduction of acetyldimethylphenylsilane: a screening with thirty strains of microorganisms}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-63906}, year = {1988}, abstract = {Thirty strains of microorganisms (bacteria, yeasts, fungi and green algae) were tested as resting free cells for their ability to transform acetyldimethylphenylsilane (1) enantioselectively into (R)-(1-hydroxyethyl) dimethylphenylsilane [(R)-2]. The biotransformations were monitared by GC (packed OV-17 column), and the enantiomeric purities of the products isolated were determined by HPLC (cellulose triacetate column, UV detection). All microorganisms tested were found to reduce 1 enantioselectively to give (R)-2. Under the test conditions used, the yeast Trigonapsis variabilis (DSM 70714) was found to 1 exhibif the highest specific activity (1.5 mg product x g cell wet mass\(^{-1}\) x min\(^{-1}\) ), whereas the highest enantioselectivities were observed for the bacteria Acinetobacter ca lcoaceticus (ATCC 31012) (>95\% ee), Brevfbacterium species (ATCC 21860) (90\% ee) and Corynebacterium dioxydans (ATCC 21766) (>95\% ee), the yeast Candida humico la (OSM 70067) (90\% ee), the fungus Cunninghame lla e legans (ATCC 26269) (94\% ee), as well as the cyanobacterium Synechococcus leopoliensis (94\% ee).· From the green algae tested, Chlamydomonas reinhardii showed the highest.enantioselectivity (85\% ee).}, subject = {Anorganische Chemie}, language = {en} } @article{EltzeGmelinWessetal.1988, author = {Eltze, M. and Gmelin, G. and Wess, J. and Strohmann, C. and Tacke, Reinhold and Mutschler, E. and Lambrecht, G.}, title = {Presynaptic muscarinic receptors mediating inhibition of neurogenic contractions in rabbit vas deferens are of the ganglionic M\(_1\)-type}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-63912}, year = {1988}, abstract = {The present study was designed to further charaeterize the presynaptie musearlnie M\(_1\)-reeeptor responsible for the inhibition of neuragenie eontraetions in the isolated rabbit vas deferens. Eleetrically induced twiteh eontraetions of this preparation were inhibited by the M\(_1\)-agonist, MeN-A-343, and by some of its analogs: 4-ehloro-phenyl derivative> MeN-A-343 > trans-olefinie analog> cis-olefinie analog. The same rank order of potency was observed for these agonists to raise the blood pressure of pithed rats by stimulation of M\(_1\)-receptors in sympathetie ganglia. A highly signifieant eorrelation was found between the antimusearinie potencies of atropine, pirenzepine and a series of 9 antagonists strueturally related to the ganglionie M\(_{1\beta}\)-receptor selective compounds, hexocyclium and hexahydro-difenidol, to antagonize the MeN-A-343-indueed inhibition of twitch eontraetions in rabbit vas deferens or the musearine-indueed depolarization in rat isolated superior eerVieal ganglia. It is suggested that the presynaptie musearlnie receptor that mediates inhibition of neuragenie contraetions in rabbit vas deferens is of the ganglionic M\(_{1\beta}\)-type.}, subject = {Anorganische Chemie}, language = {en} }