Organometallic Acetylenes of the Main Groups III-V

Abstract

The C=C and =CH stretching vibrations of triand tetraethynyl compounds are reported in Table I.

Synthesis and structure of novel spirosilanes. Combination of 1,2‐hydroboration and 1,1‐organoboration

“…, serving as starting materials, are readily available [12,13] by the reaction of SiCl 4 with the respective lithium alkynides, which were used in slight excess.…”

“…BuLi in hexane (1.6 M), SiCl 4 , 3,3-dimethyl-1-butyne, ethynylbenzene, p-tolylethynyl, glacial acetic acid and 9-borabicyclo[3.3.1]nonane were commercial products. The tetra(alkyn-1-yl)silanes 1a-c [12,13,28] were prepared following the literature procedure. Mass spectra (EI, 70 eV): Finnigan MAT 8500 with direct inlet; the m/z data refer to the isotopes 1 H, 11 B, 12 C, 28 Si.…”

Combination of 1,2‐hydroboration and 1,1‐organoboration: synthesis of novel organo‐substituted 1‐silacyclobutenes

“…BuLi in hexane (1.6 M), 9-BBN and triethylborane were commercial products. The di(alkyn-1-yl)silanes 1a and 1b 45,46 and the alkyn-1-yl(chloro)silanes 5a 10 and 5b 11 were prepared following literature procedures. The reagent 'Et 2 BH' 17 was prepared as described and the hydride concentration (1.17%) was determined by 11 B NMR spectroscopy.…”

Organoborierung von Alkinylstannanen, VI [1] Allenbildung bei einer Deorganoborierung / Organoboration of Alkynylstannanes, VI [1] Formation of an Allene by Deorganoboration

“…B(C3Ü7 1 )3) erhält man die Ausgangsprodukte zurück, während für Triethylboran und auch Trimethylboran ein anderer Reaktionsverlauf beobachtet wurde, wie im folgenden Schema (1) angedeutet: Für R = CH3 entsteht ein farbloses öl, das bisher nur iH-NMR-spektroskopisch als 2 a charakterisiert werden konnte. Die Substanz 2 b wurde nun mittels !H-, nB-, 13 C-und u9 Sn-NMR ausführlich untersucht.…”