Experimental and Computational Studies of Palladium-Catalyzed Spirocyclization via a Narasaka–Heck/C(sp<sup>3</sup> or sp<sup>2</sup>)–H Activation Cascade Reaction
es via a palladium-catalyzed tandem Narasaka–Heck/C(sp3 or sp2)–Hactivationreaction is reported here. The key step in this transformation is the activation of a δ-C–H bond via an in situ generated σ-alkyl-Pd(II) species to form a five-membered spiro-palladacycle intermediate. The concerted metalation-deprotonation (CMD) process, rate-determining step, and energy barrier of the entire reaction were
containing an acyloxy substituent at the propargylic position gave highly substituted phenols in good yields (see scheme). Depending on the structure of the silyl enol ether, either nucleophilic addition of this moiety or 1,2‐acyloxy migration occurs to give two kinds of synthetically useful, substituted phenols.
The Schmidt rearrangement using trimethylsilyl azide with various α-dialkylated β-keto esters affords a convenientsynthesis of tetrazole, precursors of α-dialkylated α-amino acids.
Components and Catalysis for the Polymerization of Olefins
申请人:Gulevich Yuri
公开号:US20070208150A1
公开(公告)日:2007-09-06
The present invention relates to a solid catalyst component for the polymerization of olefins CH
2
=CHR in which R is hydrogen or a hydrocarbon radical with 1-12 carbon atoms, comprising Mg, Ti, halogen and an electron donor selected from β-keto-ester derivatives of a particular formula. Said catalyst components when used in the polymerization of olefins, and in particular of propylene, are capable to give polymers in high yields and with high isotactic index expressed in terms of high xylene insolubility.
An inkjet ink composition includes: (a) particles of a polymer compound having at least one reactive functional group selected from the group consisting of an epoxy group, an acetoacetoxy group, a halomethyl group, a carboxylic acid anhydride, an amino group, a hydroxyl group, a phenolic hydroxyl group, and a carboxy group;(b) a reactive compound having a functional group that reacts with the reactive functional group of the (a) particles of the polymer compound by energy application; (c) a coloring agent; and (d) a water-soluble organic solvent.