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Organometallic aminoacid

Alkenes undergo nucleophilic addition when coordinated to cationic fragments, for example, [Re(CO)5]+ or [ReCp(NO)(PPh3)]+, and electrophihc abstractions when coordinated to the more electron-rich ReCp(CO)2 fragment. One example is the formation of (76) from [Re(CO)s ( -C4H6)]+ and [Re(CO)5] , but many others are known including the synthesis of a-aminoacids with organometallic side chains. [Pg.4026]

This review article is concerned with chemical behavior of organo-lithium, -aluminum and -zinc compounds in initiation reactions of diolefins, polar vinyls and oxirane compounds. Discussions are given with respect to the following five topics 1) lithium alkylamide as initiator for polymerizations of isoprene and 1,4-divinylbenzene 2) initiation of N-carboxy-a-aminoacid anhydride(NCA) by a primary amino group 3) activated aluminum alkyl and zinc alkyl 4) initiation of stereospecific polymerization of methyloxirane and 5) comparison of stereospecific polymerization of methyloxirane with Ziegler-Natta polymerization. A comprehensive interpretation is proposed for chemistry of reactivity and/or stereospecificity of organometallic compounds in ionic polymerizations. [Pg.23]

Category I. Thermodynamically stable and kinet-ically inert species (e.g., organometallics such as MeHg, TBT, selenoproteins, and Se-aminoacids). [Pg.1065]

High-frequency shoulders on Vs(CO) and Vas(CO) bands in the FTIR spectra of an organometallic probe derived from tricarbonyl(l-4- n -5-pyridinocyclohexa-l,3-diene)iron hexafluorophosphate have been observed io on incubation with a-chymotrypsin and were assigned to an iron-complex covalently bonded to enzyme-NH2 groups. Curve-fitting analysis of the spectra enabled the bound complex to be detected even in the presence of the unbound probe and its FTIR spectrum to be calculated and compared with spectral data arising from similar interactions between the tricarbonyliron moiety and twelve aminoacids and polylysine. [Pg.352]


See other pages where Organometallic aminoacid is mentioned: [Pg.55]    [Pg.4045]    [Pg.72]    [Pg.4044]    [Pg.26]    [Pg.27]   
See also in sourсe #XX -- [ Pg.139 ]




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