Synthesis, structure, and reactivity of extremely hindered disilenes: the first example of thermal dissociation of a disilene into a silylene

A Remarkable Base‐Stabilized Bis(silylene) with a Silicon(I)–Silicon(I) Bond

“…The central Si À Si bond (2.413 (2) ) is only about 0.07 longer than the sum of the Si covalent radii (2.34 ) [13] and about 0.05 longer than the SiÀSi single bond in a-silicon (2.36 ). [14] The value is 5.17 % larger than the longest disilene bond (2.29 ) [6] and 14.6 % longer than the reported disilyne bond (2.06 ), [7] and it also compares well with that of the Si I dimer reported by Robinson et al (2.393 ). [8] The sum of the bond angles of the Si atoms in 2 (282.358 average) compares very well with literature values.…”

“…Solvents were dried over molecular sieves and distilled prior to use. The NMR spectra were recorded in C 6 …”

“…[4,5] Compounds with double-bonded silicon are established and have been studied in detail during the last decade. [6] In 2004, Sekiguchi and co-workers as well as Wiberg et al were successful in isolating compounds containing SiÀSi triple bonds (RSiSiR; R = Si(iPr){CH(SiMe 3 ) 2 } 2 and R = SiMe-(SitBu 3 ) 2 ) in which the formal oxidation state of Si is + I. [7] Subsequently, Robinson and co-workers synthesized two compounds, one with a Si À Si single bond having formal oxidation state + I and another with a Si À Si double bond in which the formal oxidation state of Si is 0 (RClSiÀSiClR and RSi=SiR, R = 1,3-bis-(2,6-diisopropylphenyl)imidazol-2-ylidene).…”

The singlet-triplet energy gap in divalent three, five and seven-membered cyclic C2H2M, C4H4M and C6H6M (M = C, Si, Ge, Sn AND Pb)

“…Also, considerable development has been made in the chemistry of divalent stanylenes [12]. Finally, the isolation of the plumbylenes and their derivatives has been reported [13][14][15][16].…”

[2,6‐(Trip)2H3C6](Cp*)Si, eine stabile monomere Arylsilicium(II)‐ Verbindung

“…[14] Das noch besser kinetisch stabilisierte Diarylsilylen Tb(Mes)Si (Tb = 2,4,6-Tris[bis(trimethylsilyl)methyl]phenyl) konnte durch thermische Dissoziation bei ungefähr 70 8C in Lösung erzeugt, aber ebenfalls nicht isoliert werden. [15] Die Synthese der salzartigen Verbindung Me 5 C 5 Si…”