Triphen­yl(prop-2-yn-1-yl)silane

In the title compound, C21H18Si, the coordination geometry around the Si atom is a slightly distorted tetra­hedron with C—Si—C angles in the range 106.05 (11) to 110.58 (10) ° and Si–C bond lengths in the range 1.855 (2) to 1.883 (3) Å. The alkyne C—C bond length is 1.167 (4) Å. The dihedral angles between the three phenyl rings are 63.89 (7), 86.38 (7) and 70.51 (8)°. In the crystal, mol­ecules inter­act only by van der Waals forces

Total synthesis and structural assignment of (−)-fusaequisin A

(−)-Fusaequisin A is an irregularly assembled polyketide isolated from the ascomycete Fusarium equiseti. Fusaequisin A shares a carbon backbone with curvicollide C from the ascomycete Podospora curvicolla but its absolute configuration remained hitherto unsettled. Herein, we document the total synthesis of (−)-fusaequisin A and its 4-O-desmethyl derivative following a central-to-lateral building block strategy. Catalytic asymmetric Claisen rearrangement, Julia-Kocienski olefination and olefin cross-metathesis served as key C/C-connecting transformations. The constitution and absolute configuration of (−)-fusaequisin A was deduced and the original structural assignment was adjusted

(2SR,3SR)-Isopropyl 3-{[dimeth­yl(phenyl)­sil­yl]meth­yl}-2-hy­droxy-2-vinyl­pent-4-enoate

The relative configuration of the title compound, C19H28O3Si, which was synthesized using a dienolate-[2,3]-Wittig rearrangement, was corroborated by single-crystal X-ray diffraction analysis. The Si—C bond distances are in the range 1.858 (2)–1.880 (2) Å and an intra­molecular O—H⋯O hydrogen bond helps to stabilize the mol­ecular conformation

An update on cyclohepta[b]indoles

The cyclohepta[b]indole scaffold constitutes a salient structural motif in natural products as well as in men-made pharmaceutically active ingredients. Cyclohepta[b]indoles consist of an indole nucleus fused to a seven-membered carbacycle. Interest in cyclohepta[b]indole chemistry originates from natural product chemistry and medicinal chemistry. The chemistry of cyclohepta[b]indole-based organic functional materials may be a research area with some potential. The state of the art of cyclohepta[b]indoloid chemism has been comprehensively and scholarly summarized by the leading review article of Stempel and Gaich in 2016. Following this lead, our Minireview covers the literature from 2016 to 2021

Der Leipziger Gewerbeschullehrer August Föppl und die Theoretisierung der Technik

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(3R,4R,5S)-4-Hydr­oxy-3-methyl-5-[(2S,3R)-3-methyl­pent-4-en-2-yl]-4,5-dihydro­furan-2(3H)-one

The relative configuration of the title compound, C11H18O3, which was synthesized using a catalytic asymmetric Gosteli–Claisen rearrangement, a diastereoselective reduction with K-Selectride and an Evans aldol addition, was corroborated by single-crystal X-ray diffraction analysis. The five-membered ring has an envelope conformation with a dihedral angle of 29.46 (16)° between the coplanar part and the flap (the hydr­oxy-bearing ring C atom). In the crystal, mol­ecules are connected via bifurcated O—H⋯(O,O) hydrogen bonds, generating [010] chains

Autorreferate einschlägiger Arbeiten, die 1966 aus dem Geologisch-Paläontologischen Institut veröffentlicht wurden

Die Hercynia publiziert Originalbeiträge mit dem Schwerpunkt Ökologie (mit ihren vielseitigen Aspekten der Biodiversität), Botanik, Zoologie, Geologie und Geografie, den anwendungsorientierten Bereichen des Natur- und Umweltschutzes, sowie der Land- und Forstwirtschaft

(3S,4S,5R)-4-Hydr­oxy-3-methyl-5-[(2S,3R)-3-methyl­pent-4-en-2-yl]-4,5-dihydro­furan-2(3H)-one

The relative configuration of the title compound, C11H18O3, was corroborated by single-crystal X-ray diffraction analysis. In the crystal, mol­ecules are linked via a O—H⋯O hydrogen bond and a chain of mol­ecules is formed along [010]

Datengenerierung in Automationsgeräten, Datenintegration und Visualisierung in CPS-Leitständen

Der durchgängige Einsatz von ETHERNET-Technologien in der Industrie ermöglicht den Durchgriff auf Daten von der (Werks-)Leitebene bis in die Feldebene (Aktoren und Sensoren). Die Realisierung dieser Funktionen bedarf struktureller und funktioneller Festlegungen und Normative, an die Entwickler und Nutzer zu binden sind. Die konzipierten und umgesetzten Daten-Erfassungs-, -Übertragungs- und -Visualisierungskonzepte konnten in ihrer Funktionsfähigkeit demonstratorhaft nachgewiesen werden. Eine Anpassung auf weitere Technologien ist möglich und im Zuge der Weiterentwicklung in Richtung Vermarktbarkeit vorgesehen