Two germaoxetanes from a germene: formation and structure

A Nearly Planar Stannene with a Reactive Tin–Carbon Double Bond

“…Vinyloxystannane 9 is easily characterized by 119 Sn (δ = -96.3 ppm), 13 C (OC=CH 2 δ = 160.2 and 86.5 ppm) and 1 H NMR (=CH 2 : δ = 3.83 and 3.88 ppm) spectra. Un- like its germene analogue Mes 2 Ge=CR 2 , [20] it does not undergo a Lutsenko-like rearrangement, which would give Tip 2 Sn(CH 2 COMe)CHR 2 .…”

Silyl–substituted germenes. The reactions of germenes generated thermally from acyltris(trimethylsilyl)germane with conjugated enones

“…For 3: Anal. Calcd for C 18 3.5. Reaction of 2 with acrolein at 120 C A mixture of compound 2 (0.1093 g, 0.240 mmol) and 0.0746 g (1.33 mmol) of acrolein was heated in a sealed tube at 140 C for 12 h. Product 6 (0.0703 g, 57% isolated yield) and the starting compound 2 (0.0080 g, 7% isolated yield) were isolated by column chromatography.…”

“…It has been reported that the reaction of 1,1-dimethylbis(trimethylsilyl)germene with benzophenone affords both [2 þ 2] and [2 þ 4] cycloadducts, although the [2 þ 2] cycloadduct is the predominant species [17]. The reaction of 1,1-dimesitylfluorenylidenegermene with benzaldehyde and benzophenone gives the respective [2 þ 2] cycloadducts [18]. Similar reaction of this germene with phenylisocyanate proceeds to give a [2 þ 2] cycloadduct, germaoxacyclobutene derivative, arising from addition of the germene to a carboneoxygen double bond, but not carbonenitrogen double bond [19].…”

Germanium Organometallic Compounds: Classification and Analysis of Crystallographic and Structural Data

“…25, No.4, 2002 (5)244 pm (Si) There is one example Ge(Ph) 3 (OH) [93] which contains eight crystallographically independent molecules,,mostly differing by degree of distortion (Ge-L and L-Ge-L). Three such molecules are found in Ge(Me) 2 (rf-cbc) [75} In several other derivatives [44,47,48,55,58,65,75,89,95,98,99,102,108,116,117,119,124,134,151] two such molecules are present. All of these belong to the class of distortion isomerism [11}…”

“…There is also an example of a digermacyctodocasane (GeC| 0 ) 2 [267], There are sixteen derivatives in which a single ligand acts as a brieve between two Ge(IV) atoms: an Ο atom [98,, aN-donor [272], a C-donor [273][274][275][276][277], a S atom [278,279] and a Si-donor [162,280]. The bridge angle Ge-X-Ge is much wider when X is an Ο atom (180(1) to 134.9 ) than when it is a C atom (1223 -107 ) or an S atom(l 11.2 -106.6 ).…”