Quality Control of 1,3,5,7-Tetramethyl-6-phenyl-2,4,8-trioxa-6-phosphaadamantane. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 1,3,5,7-Tetramethyl-6-phenyl-2,4,8-trioxa-6-phosphaadamantane, is researched, Molecular C16H21O3P, CAS is 97739-46-3, about An Exclusively trans-Selective Chlorocarbamoylation of Alkynes Enabled by a Palladium/Phosphaadamantane Catalyst. Author is Le, Christine M.; Hou, Xiao; Sperger, Theresa; Schoenebeck, Franziska; Lautens, Mark.
Pharmaceutically relevant methylene oxindoles are synthesized by a palladium(0)-catalyzed intramol. chlorocarbamoylation reaction of alkynes. A relatively underexplored class of caged phosphine ligands is uniquely suited for this transformation, enabling high levels of reactivity and exquisite trans selectivity. E.g., in presence of Pd2(dba)3 and 1,3,5,7-tetramethyl-2,4,6-trioxa-8-phenyl-6-phosphaadamantane in toluene, intramol. chlorocarbamoylation of 2-TIPSCCC6H4NBnCOCl gave 96% 3-(chloromethylene)oxindole derivative (E)-I. This report entails the first transition-metal-catalyzed atom-economic addition of a carbamoyl chloride across an alkyne.
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Reference:
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics