WebThe use of a very strong, sterically hindered base, such as lithium diisopropylamide or triphenylmethyllithium (trityllithium), at low temperature (— 78 °C) in an aprotic solvent in the absence of excess ketone has become a general tool for kinetic control in selective enolate formation. WebThe anionic polymerization of benzofulvene (BF) quantitatively proceeded with various initiators, such as sec -BuLi, diphenylmethyllithium, diphenylmethylpotassium, triphenylmethyllithium, and triphenylmethylpotassium, in THF at −78 °C to give polymers having predicted molecular weights based on the molar ratios between BF and the …
Statistische Synthesen von Rotaxanen - Schill - 1980 - Chemische ...
WebDec 21, 2024 · The element lithium has been discovered 200 years ago. Due to its unique properties it has emerged to play a vital role in industry, esp. for energy storage, and lithium-based products and processes support sustainable technological developments. WebThese compounds react with triphenylmethyllithium to give 17a, b and 18a, b from which the rotaxanes 20a, b are obtained in 0.066 or 0.18 and 0.12% yield, respectively, after … iowa first degree theft
Hetero-telechelic polymers and processes for making same专利检 …
WebTriphenylmethyllithium C19H15Li CID 11345692 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, … WebJan 1, 2015 · Anionic addition polymerization is an ionic polymerization of vinyl monomers and can be categorized as a chain polymerization initiated with nucleophilic reagents, such as organolithiums, Grignard reagents, and metal alkoxides. Anionic addition polymerization proceeds with the growing chain end carrying negative charge and counter cation. Webmixture of triphenylmethyllithium and cesium-3-ethyl- 3-heptoxide in THF solution, supported by MNDO calculation, revealed the formation of discrete species of iowa first time home buyer savings account