Dodecamethyldioxa[1.1]di-p-disilinocyclophane. Novel organosilicon cyclophane

Abstract

The title compound was prepared via high-dilution hydrolysis of 1,4-dichloropermethyl-p-disiline (2). This cyclophane exhibits high stability toward electron bombardment as evidenced by its very simple mass spectrum.compounds of type ii p-disilines. Application of this nomenclature shortens the name of substituted ii considerably.(3) W. H.

Fully‐Branched Hyperbranched Polymers with a Diselenide Core as Glutathione Peroxidase Mimics

“…To the solution was added a NaSeSeNa aqueous solution (4.0 ml, 0.5 M ) (prepared according to a literature method) 36. (According to previous work,37 the reaction of 1,5‐dibromopentane with disodium diselenide in a ratio of 1:1 is expected to give cyclic or polymeric products, so, in order to obtain the desired product 5 , a more than 4‐fold excess of 1,5‐dibromopentane was used.) The mixture was heated at 50 °C under argon for 24 h, poured into water and extracted with CH 2 Cl 2 .…”

1,4-Disilacyclohexa-2,5-diene: a molecular building block that allows for remarkably strong neutral cyclic cross-hyperconjugation

“…32 Although the few earlier experimental studies focused on synthesis rather than spectroscopy, [33][34][35] it is interesting that the 1 H NMR chemical shift of the vinylic protons in 1,1,4,4-tetramethyl-1,4-disilacyclohexa-2,5-diene was found at 6.84 ppm, exceptionally low-field for vinylic protons. 36 In the present study, 1,4-disilacyclohexa-2,5-dienes with either Cl (1a), Me (1b), or SiMe 3 (1c, TMS) substituents at the Si atoms and ethyl substituents at the sp 2 hybridized C atoms ( Figure 1) were synthesized and examined by X-ray crystallography, gas phase UV absorption spectroscopy, UV photoelectron spectroscopy (UPS), and cyclic voltammetry. As a reference for a non-cross-hyperconjugated compound, the all-carbon analogue, i.e., cyclohexa-1,4-diene (6), was also examined by gas phase UV absorption spectroscopy.…”

“…The earlier studies on the parent 1,4-disilacyclohexa-2,5-diene (1) have focused on synthesis rather than spectroscopy. [32][33][34][35] In the present study, 1,4-disilacyclohexa-2,5-dienes with either Cl (1a), This journal is © The Royal Society of Chemistry 2014 Me (1b), or SiMe 3 (1c, TMS) substituents at the Si atoms and ethyl substituents at the sp 2 hybridized C atoms (Fig. 1) were synthesized and examined by X-ray crystallography, UV photoelectron spectroscopy (UPS), cyclic voltammetry and gas phase UV absorption spectroscopy.…”