Acetic anhydride, 4-dimethylaminopyridine
(DMAP), ethanol and n-hexane used were obtained from Fluka.
N,N,N',N'" N"-pentamethyldiethylenetriamine (PMDETA, Aldrich, 99%), ethyl alpha-bromoisobutyrate (EBiB, Aldrich, 97%), alpha-bromoisobutyryl bromide (BiBB, Aldrich, 97%), anisole (Aldrich, 99%), (3-Aminopropyl)triethoxysilane (APTES, Sigma-Aldrich, 99%), AVV'-Dicyclohexylcarbodiimide (DCC, Aldrich, 99%), 4-dimethylaminopyridine
This claim has been demonstrated in the research of Auzely-Velty and Rinaudo (2003), for the synthesised starch betaine derivatives using disopropylcarbodiimide and 4-dimethylaminopyridine
as coupling agents in an aprotic polar solvent, which carry cleavable cationic groups derived from naturally occurring glycine-betanine.
54 mmol) in anhydrous pyridine (8 mL) at 0 [degrees]C followed by addition of 4-dimethylaminopyridine
(DMAP) and dibutyltin dilaurate (DBTDL) were purchased from GE Co.
We have found that addition donor ligands such as 1-methylimidazole or 4-dimethylaminopyridine
(DMAP) are capable of completely inhibiting the metathesis reaction, such as RCM and ROMP, when at least two equivalents are used to completely produce a six-coordinate species of low activity.
However, in recent research described during the talk, which was performed together with fellow graduate student Eric Rivard, MCIC, in Ian Manners, FCIC's, group at the University of Toronto, the presence of a strong donor ligand (L) such as 4-dimethylaminopyridine
has been found to allow the labile cations to be isolated and fully characterized (Scheme 3).
The use of 1-methyladenine or 4-dimethylaminopyridine
as activating groups ([ILLUSTRATION FOR FIGURE 4 OMITTED], line 2) results in the formation of oligomers in which 90% of the phosphodiester bonds are 3[prime],5[prime]-linked (9, 10).
(DMAP), acrylic acid (AAc), acryloyl chloride, and AGV-dicyclohexylcarbodiimide (DCC) were used as received.
0015 mol 4-dimethylaminopyridine
showed complete conversion after 24 h.
was used as an internal standard.
(DMAP), triethylamine (TEA), 4,4'-diaminodiphenyl sulfone (DDS), and anhydrous ethylether were purchased from Sinopharm Chemical Reagent Beijing Co.