Shi, Kai; Lu, Chengrong; Zhao, Bei published the artcile< Carboxylation of terminal alkynes with CO2 catalyzed by imidazolium-bridged bis(phenolato) rare-earth metal complexes>, Electric Literature of 3240-10-6, the main research area is alkynyl carboxylic acid preparation; terminal alkyne carbon dioxide carboxylation; propargylic ester preparation; alkyl bromide alkyne carbon dioxide carboxylation esterification; imidazolium chloride bisphenolatometal complex catalyst.
Five imidazolium-bridged bis(phenolato) rare-earth metal complexes containing Y, Yb, Sm, Nd, La were synthesized using a readily available bisphenoxy-functionalized imidazolium salt I and the corresponding rare-earth metal precursors R[N(SiMe3)2]3 were well characterized by single crystal diffraction anal., elemental anal., and NMR for complexes. The complexes were successfully applied to the carboxylation reactions of terminal alkynes R1CC (R1 = 4-fluorophenyl, pyren-1-yl, thiophen-2-yl, etc.) with CO2, yttrium complex showed the highest catalytic activity. A variety of different alkynyl carboxylic acids R1CCC(O)OH in excellent yields was obtained under atm. pressure. Notably, further esterification occurred smoothly in the current catalytic system via the one-pot three-component reaction using terminal alkynes, CO2 and alkyl bromides R2Br (R2 = n-Bu, Bn, 3-phenylprop-2-en-1-yl) as starting materials. Several substituted propargylic esters R1CCC(O)OR2 were obtained in moderate to excellent yields at 1 bar pressure and 50°C.
New Journal of Chemistry published new progress about Alkynes, α- Role: RCT (Reactant), RACT (Reactant or Reagent). 3240-10-6 belongs to class chlorides-buliding-blocks, and the molecular formula is C9H5ClO2, Electric Literature of 3240-10-6.
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics