Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， Recommanded Product: N1-(2-(Dimethylamino)ethyl)-N1,N2,N2-trimethylethane-1,2-diamine, Which mentioned a new discovery about 3030-47-5
Carbon-13 NMR line shape analysis of the lithium isotopomers of 2,4,6-tri-tert-butylphenyllithium monomer, 4, complexed to THF establishes that electric quadrupole induced relaxation of 7Li is responsible for partial averaging of 1J(13C,7Li). The dynamics of intramolecular carbon-lithium bond exchange between monomers of 4 in THF solutions have been monitored by NMR line shape analysis, signal averaging of 1J(13C,6Li) observed above 240 K, yielding activation parameters of DeltaH? and DeltaS? of respectively 14.4 kcal/mol and 7 eu. All except the meta carbons of mesityllithium, 5, monomer tridentately complexed to N,N?,N?,N?,N?-pentamethyldiethylenetriamine, PMDTA, are magnetically non-equivalent at 184 K, supporting an asymmetric structure in which lithium is chiral. With increasing temperature above 184 K the shifts between the ortho ring carbons, the ortho methyls, and two doublets due to methylenes progressively average to single lines at their respective centers, the result of increasingly fast rotation around the carbon-lithium bond, with resulting activation parameters of DeltaH? and DeltaS? of respectively 5 kcal/mol and -21 eu. It is proposed that rotation is chemically driven, the result of Li, N reversible dissociation accompanied by an uptake by Li of one THF molecule.
Because enzymes can increase reaction rates by enormous factors and tend to be very specific, Recommanded Product: N1-(2-(Dimethylamino)ethyl)-N1,N2,N2-trimethylethane-1,2-diamine, typically producing only a single product in quantitative yield, they are the focus of active research.you can also check out more blogs about 3030-47-5
Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI