1,1‐Ethylboration of alkyn‐1‐yl‐chloro(methyl)silanes: alkenes with chloro(methyl)silyl and diethylboryl groups in cis positions

1‐Silacyclopent‐2‐enes and 1‐silacyclohex‐2‐enes bearing functionally substituted silyl groups in 2‐positions. Novel electron‐deficient SiHB bridges

“…29 Si satellites are marked by asterisks and diamonds, respectively (for other data see Table 1). Any appreciable coordinative Br-B bonding in 5 should be mirrored by increased 11 B nuclear magnetic shielding, 15 which is not the case.…”

“…In this context, silyl groups R 1 with a Si-H or a Si-halogen function might be interesting candidates, considering further transformations and potential formation of Si-H-B 10 -14 or Si-halogen-B bridges. 15 Although there is some interest in 1-silacyclopentenes 16 -21 and 1-silacyclohexenes, 10,14 the convenient access to these heterocycles is limited so far to the hydroboration/organoboration method. 9 Therefore, the silanes 1-3 (Scheme 1) were prepared, and their reactivity towards 9-borabicyclo[3.3.1]nonane (9-BBN) was studied.…”

Triel‐Bonded Complexes between TrR3 (Tr=B, Al, Ga; R=H, F, Cl, Br, CH3) and Pyrazine

“…Monosubstituted BH 2 X (X=F, Cl, Br, I) molecules contain both π‐ and σ‐hole regions and can consequently form stable homodimers. Other work has demonstrated that Si−H⋅⋅⋅B interactions can stabilize silicon‐boron complexes . There are also examples of charged‐assisted triel bonding interactions in the context of solid state chemistry .…”

Triel–hydride triel bond between ZX3 (Z = B and Al; X = H and Me) and THMe3 (T = Si, Ge and Sn)

“…Triel bonding exhibits some surprising cooperativity with other types of interactions including hydrogen, halogen, pnicogen and tetrel bonds since the binding distance in the strong triel bond undergoes a prominent contraction. Numerous studies have demonstrated that the intramolecular Si–H···B bridge can maintain the conformation of compounds simultaneously containing silicon and boron atoms …”