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An investigation of the chemistry of the tert-butyl-substituted molybdenocene system, {(CpBut)2Mo} (CpBut = C5H4But), has demonstrated that the η2-acetonitrile ligand in (CpBut)2Mo(η2-MeCN) may be alkylated by RI (R = Me, Et) at nitrogen to give iminoacyl derivatives, [(CpBut)2Mo(η2-MeCNR)]+, which is a new type of reactivity for mononuclear acetonitrile complexes. A series of chalcogenolate–hydride complexes (CpBut)2Mo(EPh)H (E = S, Se, Te) have been obtained by reaction of (CpBut)2MoH2 with Ph

A series of phosphorus-bridged ansa -metallocene complexes of titanium, zirconium, and hafnium, [PhP(C 5 Me 4 ) 2 ]MX 2 and [Ph(E)P(C 5 Me 4 ) 2 ]MX 2 (X = Cl, Me, CO, (Se 3 ) 0.5, (Te 3 ) 0.5; E = O, S, Se), has been synthesized. Structural characterization by X-ray diffraction indicates that, in comparison to their non- ansa counterparts (C 5 Me 5 ) 2 MX 2, the cyclopentadienyl groups in phosphorus-bridged complexes are displaced from symmetric η 5 -coordination toward η 3 -coordination. Such

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTelluroformaldehyde, Tellurido, and Ditellurido Derivatives of PermethyltantaloceneJun Ho Shin and Gerard ParkinCite this: Organometallics 1994, 13, 6, 2147–2149Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://pubs.acs.org/doi/10.1021/om00018a004https://doi.org/10.1021/om00018a004research-articleACS PublicationsRequest reuse permissionsArticle Views160Altmetric-Citations32LEARN ABOU

Breast contour deformities, lack of volume and asymmetry are common confronted problems after breast augmentation with implants. These problems can be corrected by using temporary fillers or autologous fat grafts. The purpose of this study was to introduce our experience using long lasting temporary filler (Aquafilling®) for the correction of unfavorable results after breast augmentation with silicone implants. Two non-pregnant, non-breastfeeding women unsatisfied with previous breast augmentati

Gallbladder polyps with 10-11 mm in asymptomatic young patients (less than 50 years old) have low risk of malignancy, and therefore, a careful "wait and see with follow up by using ultrasonography strategy" might be more appropriate than immediate cholecystectomy.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelenium Complexes of Permethyltantalocene: Interesting Contrasts with Their Tellurium AnalogsJun Ho Shin and Gerard ParkinCite this: Organometallics 1995, 14, 3, 1104–1106Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inissue 1 March 1995https://pubs.acs.org/doi/10.1021/om00003a010https://doi.org/10.1021/om00003a010research-articleACS PublicationsRequest reuse permissionsArticle Views107Altmetric-Citation

The ansa-effect, as it applies to tantalocene chemistry, has been investigated by a comparison of the chemistry of [Me2Si(C5Me4)2]TaH3 and [Me2Si(C5Me4)2]Ta(η2-C2H4)H with their permethyltantalocene counterparts; these studies demonstrate that incorporation of the [Me2Si] ansa bridge substantially enhances the rates of both reductive elimination of H2 and ethylene-insertion into a Ta–H bond.

J. Ho Shin and G. Parkin, Chem. Commun., 1998, 1273 DOI: 10.1039/A801835I

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAn Experimental and Computational Analysis of the Formation of the Terminal Nitrido Complex (η3-Cp*)2Mo(N)(N3) by Elimination of N2 from Cp*2Mo(N3)2: The Barrier to Elimination Is Strongly Influenced by the exo versus endo Configuration of the Azide LigandJun Ho Shin, Brian M. Bridgewater, David G. Churchill, Mu-Hyun Baik, Richard A. Friesner, and Gerard ParkinView Author Information Department of Chemistry, Columbia University New York, New York

The phosphonium-bridged ansa -metallocene complexes {[Me 2 P(C 5 Me 4 ) 2 ]ZrCl 2 } + and {[Me 2 P(C 5 Me 4 ) 2 ]HfCl 2 } + have been prepared by the reactions of {[Me 2 P(C 5 Me 4 ) 2 ]Li 2 }I with ZrCl 4 and HfCl 4, respectively; the isolation and structural characterization of {[Me 2 P(C 5 Me 4 ) 2 ]ZrCl 2 } + complete a series of isostructural zirconocene derivatives, namely, [R 2 P(Cp R ) 2 ZrCl 2 ] +, [R 2 E(Cp R ) 2 ZrCl 2 ] (E = C, Si, Ge), and [R 2 B(Cp R ) 2 ZrCl 2 ] -, which differ ac

The trihydride complex Cp* 2 TaH 3 is a convenient precursor to a series of halide derivatives, which include unusual examples of organometallic fluoride complexes. Most interestingly, reaction of Cp* 2 TaH 3 with (C 5 H 5 N)(HF) x affords the trifluoride complex Cp* 2 TaF 3 when carried out in a plastic vessel, but the tetrafluoroborate complex [Cp* 2 TaF 2 ][BF 4 ] when performed in a borosilicate glass vessel. In contrast, reaction of Cp* 2 TaH 3 with [Et 3 N(HF) 3 ] results in cleavage of on

Studies on square planar iridium complexes of the type trans-Ir(PR(3))(2)(CO)Cl, where PR(3) is PhP[(C(5)Me(4))](2), PhP[Me(2)C(4)H(6)], or PhP[Pr(i)(2)C(4)H(6)], demonstrate that monodentate chiral phosphines impart exceptional degrees of diastereoselectivity in the oxidative addition of H(2). Thus, the oxidative addition of H(2) to the two faces of the meso isomer (R,S)-trans-Ir(PR(3))(2)(CO)Cl proceeds with a kinetic diastereoselectivity which exceeds that for related square planar iridium co