Ferrocene reacts with BI3 and BBr3 to give 1,1′-bis(dihalogenboryl)ferrocenes; the cyclopentadienylring in cymantrene is twice borylated by BI3. By halogen exchange with AsF3 and AsCl3, by methylation with Sn(CH3)4, by cleavage of (C2H5)2O, by redox reaction with (CH3S)2 and by reaction with (C2H5)2NH the corresponding diborylferrocenes are obtained. The air-sensitive halogenborylferrocenes form donor-acceptor compounds with Lewis bases. 1H, 11B and 13C NMR data reflect increasing π-acceptor properties with increasing Lewis acidity of the boryl groups.
Remote controls are part of everyday life. Unfortunately, the experience of using a remote is not always pleasurable. This research documents the process of developing multiple remote control concepts that are ergonomic and enjoyable to use. As part of the design process, we researched design concepts with 147 consumers in three cities. The research yielded design-specific data, but also provided insight to some general consumer trends in remote usage and preference for children and adults. This research also suggests that an expanded definition of usability may be required for certain product categories such as consumer electronics. Central to this expanded definition are the concepts of behavioral and emotional usability. Behavioral usability refers to the traditional work related definition of usability. Emotional usability refers to additional needs, such as entertainment or enjoyment, that enhance the product usage experience.
4.7 ppm). Damit sollten sich IR-und Raman-Spektren des tert-Butyl-Kations erstmals vollstandig untersuchen lassen, dadie Banden von [A12Br7]-gegeniiber denen von [A12C17]stark verschoben sind.
ArbeitsvorschrijiDie Reaktionen wurden in abgeschmolzenen Glasampullen durchgefiihrt. Da fliissiger Chlorwasserstoff bei 36°C einen Eigendampfdruck von 60 atm entwickelt, muR rnit dickwandigen Glasampullen gearbeitet werden. 5-mm-NMR-Rohrchen rnit 0.7mm Wandstarke erwiesen sich als bis zu 30°C stabil. NMR-Spektren wurden jedoch zur Vorsicht bei hochstens -30°C aufgenommen. -Typische Konzentrationen fur ein NMR-Experiment : 1 mmol A1,C16, 0.5mmol tert-Butylchlorid und 7mmol HCI. Die Substanzen wurden unterAusschlu8 von Feuchtigkeit bei -196°C im Vakuum eingeschmolzen. Die Konzentration an tert-Butylchlorid in diesem Gemisch und damit die nach der Reaktion vorhandene [C(CH3),] +-Konzentration ist etwa 1.5 mol/l.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.