Cyclotetrasilenyl:  The First Isolable Silyl Radical

Isomeric Al2R4, Mg2R2 Species and Oligomerisation Products: Investigation of Al–Al and Mg–Mg σ Bonding

“…The focus of the present work has been on the theoretical investigation of recently synthesised dinuclear and tetranuclear aluminium [8] and magnesium [2,4] compounds with ex- [19][20][21] P 2 C 2 , [22] Ge 2 N 2 , [23] Sn 2 N 2 [24] and Si 4 , [25] which have been subject to several reviews. [26,27] Of particular interest has been the exceptional electronic structure of 2 with its diradical character.…”

Si‐, Ge‐, and Sn‐Centered Free Radicals: From Phantom Species toGrams‐Order‐Scale Materials

“…The cyclic silicon analogue of the delocalized allyl radical, cyclotetrasilenyl radical 3, was recently reported by Sekiguchi et al [15] This compound, representing the first stable Si-centered radical, was synthesized by the one-electron reduction of the precursor compound, cyclotetrasilenylium ion 4, [16] with either silylsodium tBu 3 SiNa or KC 8 in Et 2 O (Scheme 4).…”

“…One can easily notice that, in contrast to the allylic-type cyclotrigermenyl radical 1 [13] and cyclotetrasilenyl radical 3, [15] the bicyclic radical 6 [18] has a localized structure caused by the absence of the π bond in the proximity necessary for effective through-bond interaction and by the insufficiency of the through-space interaction with the C=C double bond to enable the remarkable delocalization of the odd-electron density.…”

Stable Cubic Phosphorus‐Containing Radicals

“…Examples of stable neutral radicals are less common, but several have been structurally characterized recently in the solid state by X-ray crystallography, for example, CB 11 Me 12 C, [3] [M(dbdab) 2 ] (M = Al, Ga; dbdab = 1,4-di-tertbutyl-1,4-diazabutadiene), [4] [R 2 MMR]C (M = Ga, Al; R = SitBu 3 ), [5][6][7] R 3 SiSi(tBu) 2 C [R = SiMe(tBu) 2 ], [8] [R 3 E]C (E = Si, Ge; R = SiMe(tBu) 2 ), [9] and [Ge(C 6 H 3 Mes 2 -2,6)]C (Mes = 2,4,6-(CH 3 ) 3 C 6 H 2 ). [10] The structure of the phosphorus-centered radical DP[CH(SiMe 3 ) 2 ] 2 C has been determined in the gas phase by electron diffraction.…”