Reactions ofgem-Dibromo Compounds with Trialkylmagnesate Reagents to Yield Alkylated Organomagnesium Compounds

Static and Ultrasonic‐assisted Aging Effects on the Synthesis of Analcime Zeolite

“…7,7‐Dibromobicyclo[4.1.0]heptane :26 Benzyltriethylammonium chloride (293 mg, 1.29 mmol, 2 mol %) and cyclohexane (6.08 mL, 4.93 g, 60.0 mmol) were mixed in a flask under N 2 . The suspension was cooled to 0 °C, then dichloromethane (6 mL), absolute EtOH (0.25 mL), bromoform (7.9 mL, 22.8 g, 90.3 mmol) and 50 % aqueous NaOH (30 mL) were added in succession.…”

“…trans ‐7‐Bromobicyclo[4.1.0]heptane :26 7,7‐Dibromobicyclo[4.1.0]heptane (1.5 mL, 3.0 g, 11.9 mmol) in THF (20 mL) was cooled to −95 °C under N 2 , at which point, n ‐butyllithium (8.2 mL, 1.5 m in hexanes, 12.3 mmol) was added. The solution was stirred for 10 min, quenched with absolute EtOH (4 mL) and stirred for 1 h while allowed to warm to room temperature.…”

Regio‐ and Stereoselective Approach to 1,2‐Di‐ and 1,1,2‐Trisilylethenes by Cobalt‐Mediated Reaction of Silyl‐Substituted Dibromomethanes with Silylmethylmagnesium Reagents

“…Halogen–cobalt exchange initially takes place to produce intermediate 3 . One of the silylmethyl groups on the cobalt center migrates to generate 4 with concomitant liberation of bromide 12. β‐Hydride elimination finalizes the formation of 1,1,2‐trisilylethene 2 .…”

Alkaline-Earth Metal Compounds

“…Warming the solution to room temperature resulted in (copper catalyzed) alkyl migration with resulting electrophilic quenching yielding -functionalized -silyl pentane. A different reactivity was witnessed for the methyl homologue LiMgMe3, with only the monomethylated bromo product being observed [65]. This distinction was at-tributed to the greater reactivity of intermediate A over LiMgMe3, meaning that A preferentially abstracts a bromine atom from R3SiCHBr2 to generate the monomethylated product as demonstrated in the top pathway of Figure 24.…”