Phenylisocyanation and bromination studies on lanthanide ?-diketonates

Shankar, G; Ramalingam, S.

doi:10.1007/bf00620675

Cited by 7 publications

(1 citation statement)

References 13 publications

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“…Complex 4 exhibits the same solubility as that of 2 and the same blue color. The bromination of Ce(acac) 4 was described previously18 by using NBS ( N ‐bromosuccinimide) to yield Ce(Br‐acac) 4 . A ligand transfer to TiCl 4 was investigated to further elucidate the reactivity of complex 3 .…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Structure, and Reactivity of Cerium(IV) Calix[4]arene Complexes

et al. 2007

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The equimolar reaction of Ce(hfac)4 (1) (hfac = 1,1,1,5,5,5‐hexafluoropentanedionato) with p‐tBu‐calix[4](OMe)2(OH)2 in toluene gave the new cerium(IV) calix[4]arene complex {p‐tBu‐calix[4](OMe)2(O)2}Ce(hfac)2 (2). The single‐crystal X‐ray structure shows the cone geometry of the calixarene ligand with the methoxy groups coordinated to the cerium; it shows slightly longer cerium–oxygen (acetylacetonate ligand) bond lengths than the corresponding bonds in the analogous nonfluorinated complex {p‐tBu‐calix[4](OMe)2(O)2}Ce(acac)2 (3). The bromination reaction of 3 gave the bisbrominated complex {p‐tBu‐calix[4](OMe)2(O)2}Ce(Br‐acac)2 (4). 1H NMR spectroscopic studies and a single‐crystal X‐ray structure of 4 revealed that the bromination took place in the 3‐position of the acac ligand. Furthermore, the first X‐ray photoelectron spectroscopy (XPS) evaluation of the Ce oxidation state in cerium calix[4]arene complexes 2 and 3 is presented, and X‐ray induced changes of Ceox in these complexes are detected. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

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Section: Resultsmentioning

confidence: 99%

Synthesis, Structure, and Reactivity of Cerium(IV) Calix[4]arene Complexes

et al. 2007

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Insertionsreaktionen mit Isocyanaten — Reaktionsmöglichkeiten, Kinetik, Mechanismen

Noack

Schwetlick

1987

Zeitschrift fuer Chemie

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The insertion reactions of isocyanates into CN, CO, CS, SiN, SiO, SiS, SiP, PN, PO, PM, BC, BN, BO, BS, BHal, SnN, SnO, SnS and other MX bonds are reviewed. Rate constants are in the range of 10−6 to 103 M−1 s−1, often above 10 M−1 s−1. Reaction mechanisms freguently involve equilibria prior to the rate determining step. Cyclisations to N‐heterocycles, uretdiones and isocyanurates and formation of carbodiimides are observed as side‐reactions. Ring expansions open routes to macrocyclic compounds. Insertions are important in organometal catalysis of isocyanate reactions as well as in metal complex catalyzed syntheses and, therefore, in a number of industrial processes.

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N.m.r. characterisation of linkage isomers

Ramalingam

Samath

1990

Transition Met Chem

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Phenylisocyanation and bromination studies on lanthanide ?-diketonates

Cited by 7 publications

References 13 publications

Synthesis, Structure, and Reactivity of Cerium(IV) Calix[4]arene Complexes

Synthesis, Structure, and Reactivity of Cerium(IV) Calix[4]arene Complexes

Insertionsreaktionen mit Isocyanaten — Reaktionsmöglichkeiten, Kinetik, Mechanismen

N.m.r. characterisation of linkage isomers

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