Cyclic digold(I) complexes, containing bridging diphosphine and diacetylide ligands and with 15-to 22-membered rings, are reported. Oligomeric complexes [C 6 H 4 (OCH 2 CtCAu) 2 ] n were prepared from AuCl(SMe 2 ) and o-, m-, or p-bis(propargyloxy)benzene and then reacted with the diphosphines Ph 2 P(CH 2 ) n PPh 2 (n ) 1-6) to give the corresponding ring complexes [C 6 H 4 (OCH 2 CtCAu) 2 {µ-Ph 2 P(CH 2 ) n PPh 2 }]. Alternatively, a two-step procedure in which the soluble isocyanide complex [p-C 6 H 4 (OCH 2 CtCAuCNtBu) 2 ] was prepared, followed by displacement of the isocyanide ligands by the diphosphine, could be used. The complexes [m-C 6 H 4 (OCH 2 CtCAu) 2 (µ-Ph 2 PCH 2 PPh 2 )], [m-C 6 H 4 (OCH 2 CtCAu) 2 {µ-Ph 2 P(CH 2 ) 5 PPh 2 }], [p-C 6 H 4 (OCH 2 CtCAu) 2 {µ-Ph 2 P(CH 2 ) 3 PPh 2 }], and [p-C 6 H 4 (OCH 2 CtCAu) 2 {µ-Ph 2 P(CH 2 ) 5 -PPh 2 }] have been characterized by X-ray structure determinations. The ring complexes are emissive at room temperature and may exhibit either red or blue shifts between solution and the solid state.

Reaction of the homoleptic yttrium amido complex Y[N(SiMe3)2]3 with C5Me4HSiMe2N(H)-t-C4H9, Cp*HSiNHR, at 100 °C resulted in elimination of 2 equivalents of HN(SiMe3)2 and attachment of the Cp-amido donor to yttrium. The product (Cp*SiNR)YN(SiMe3)2, 1, was isolated in 40% yield and was characterized crystallographically (triclinic, space group [Formula: see text] a = 8.9759(23) Å, b = 9.504(7) Å, c = 18.294(6) Å, V = 1423.4(12) Å3, Z = 2, R = 0.061, Rw = 0.053). Metrical parameters associated with the N(SiMe3)2 ligand were suggestive of weak β-SiC agostic interactions that stabilize the electron-deficient yttrium center. Alkylation of 1 resulted in unstable alkyl derivatives that could not be isolated. Keywords: cyclopentadienyl-amido, amine elimination, yttrium complex.

Over the past ten years, great improvements have been observed in the Year 12 attainment rate of Indigenous Australians. This has been due, in part, to government funding of programs aimed at improving education opportunity for Indigenous Australian students, including funding of scholarships for students from remote areas to attend boarding schools. The current qualitative study investigated the perspectives of school leaders and Indigenous secondary students across the Australian state of Western Australia, on the utility and impact of this boarding provision. Students identified that boarding education allowed them to achieve a dual goal of meaningful career pathways and improved health outcomes, although they faced challenges unique to the Indigenous boarding school experience in terms of student self-concept, racism, homesickness and post-school transitions.

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Filipin complex was obtained from Sigma (F-9765) as a crude mixture containing about 50% filipin 111 or from Upjohn (Lot 2923-DEV-39) containing about about 8 % filipin 111. It can be purified by reversed-phase preparative HPLC. The location of the C1' acetates in 3 and 4 were determined by their cross-peak in the COSY spectra with the readily identifiable C2 proton. The C15 acetate in 3 was identified by the simplicity of its coupling pattern. The location of the C7 acetate in 4 is less secure, and was assigned from the COSY spectrum. The second acetate in 4 must be at either at C7 or C11, and its location does not affect the stereochemical analysis. The assignments for these protons are listed in Fable 1.