A simple and efficient synthesis of N-sulfonyl ketimines through a Pd-catalyzed cross-coupling reaction between organoboronic acids and tosylbenzimidoyl chlorides under mild conditions has been developed.
Mesomeric divalent 1,1‘-(3-oxapentamethylene)-bridged bis(indenyl)lanthanidocenes, meso-[O(CH2CH2C9H6)2]Ln·(DME) (Ln = Sm (2),Yb (3)), have been synthesized by reduction of a
mixture of rac/meso-[O(CH2CH2C9H6)2]LnCl·THF (Ln = Sm, Yb) with Na or reaction of LnI2
(Ln = Sm, Yb) with [O(CH2CH2C9H6K)2] in THF followed by recrystallization in DME. The
structures of these meso, ansa-lanthanidocenes were determined by X-ray diffraction analysis.
The factors that dictated the rac/meso selectivity are discussed. Nonbridged divalent
lanthanide complexes (CH3OCH2CH2C9H6)2LnII (Ln = Sm (4), Yb (5)) were also synthesized
for comparison by the reaction of LnI2 (Ln = Sm, Yb) with (CH3OCH2CH2C9H6)2K in THF.
Stereoselective polymerization of methyl methacrylate with these divalent lanthanide
complexes as single-component catalysts was preliminarily investigated.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.