Suspension Copolymerization as a Route to Trityl-Functionalized Polystyrene Polymers

Triarylcarbenium Chlorides as Catalysts in Allylation Reaction: A Unique Type of Reaction with Negligible Intervention of Silyl Catalysis

“…To find out the best combination of a diarylmethyl template and a pendant aryl group to reach a maximal reactivity of the corresponding trityl-type chloride, we have prepared various trityl-type alcohols by independent treatment of xanthone, fluorenone, benzophenone, and dibenzosuberone with five different aryllithiums of varying electron demands. , The resulting alcohols can be readily converted to the corresponding chlorides by treatment with SOCl 2 (5 equiv) in anhydrous CCl 4 at 0 °C or at ambient temperature, Scheme . In the cases with the parent (Ar = C 6 H 5 ) and electron-releasing (Ar = 4- t -BuC 6 H 4 , 4-MeOC 6 H 4 ) aryl appendages, the trityl chlorides are stable enough to allow for full spectroscopic characterizations .…”

The Synthesis of (4-Ethenylphenyl)diphenylmethanol

“…Therefore we have attempted to repeat this preparation. The product was as reported earlier 7 as a viscous yellow oil. In our hands the material produced from this procedure had a highly viscous nature.…”

“…Grignard reactions have also been used. − However, the normal procedure in Grignard reactions is to add the alkyl halide to magnesium so that the Grignard reagent has little chance to react with the halostyrene. We were therefore surprised to find a report on the synthesis and polymerization of 1 by addition of tert -butyllithium to bromostyrene followed by reaction of the supposed styryllithium with benzophenone. Since this procedure must initially produce styryllithium (an anionic initiator) in the presence of bromostyrene (a monomer that is capable of undergoing anionic polymerization 8 ), anionic polymerization should ensue.…”

Electrophile Cleavable Linker Units

“…[125] For example, Chen and coworkers used the trityl linker to immobilize 1,4-butanediol (36) in pyridine (for 2 days at room temperature) and the remaining free alcohol of 37 was oxidized to generate the aldehyde. Horner-Emmons C2-unit extension of the aldehyde resin provided the α, β-unsaturated ketone resin 38.…”