Itece~tl~, an approach to k~owldge d~co~er~, called A~ribute Focusing, ham been used by.soflwa~ development teams to discover ~¢h ~owledge categorical defeef data as allows them to imFeo~e ~eir process of software development in real Sime. This feedback is provided by computing the difference o] the obme~ed propo~ion wiShin a selected ea~ego,j ~om an effipected proportion for that category, and...

For a number field F and prime p, the ℤp-torsion module of Galois group maximal abelian pro-p extension unramified outside p over F, denoted by $${{\cal T}_p}(F)$$ , is an important subject in p-ramification theory. In this paper, we study T}_2}(F) = {{\cal T}_2}(m)$$ quadratic $$F \mathbb{Q}(\sqrt m )$$ . Firstly, assuming > 0, prove explicit 4-rank formula for fields that $${\rm{r}}{{\rm{k}}_...

Both (PNP)Re(H)(4) and (PNP)ReH(cyclooctyne) (PNP(i)(Pr) = ((i)Pr(2)PCH(2)SiMe(2))(2)N) react with alkylpyridines NC(5)H(4)R to give first (PNP)ReH(2)(eta(2)-pyridyl) and cyclooctene and then, when not sterically blocked, (PNP)Re(eta(2)-pyridyl)(2) and cyclooctane. The latter are shown by NMR, X-ray diffraction, and DFT calculations to have several energetically competitive isomeric structures ...

A series of previously unknown bridgehead-functionalized bicyclo[2.2.2]octasilanes, Me3Si-Si8Me12-X, X-Si8Me12-X, and X-Si8Me12-Y [X, Y = -SiMe n Ph3-n (n = 1, 2) (2, 3, 10), -SiMe2Fc (Fc = ferrocenyl) (4, 11, 13, 14), -COR (R = Me, tBu) (6, 7, 12), COOMe (8), COOH (9)], have been prepared by the reaction of the silanides Me3Si-Si8Me12-K+ or K+-Si8Me12-K+ with proper electrophiles and fully cha...

A series of monocarbonyl iron complexes in the formal oxidation states 0, +1, and +2 are accessible when supported by a tetradentate tris(phosphino)silyl ligand (SiP(iPr)(3) = [Si(o-C(6)H(4)PiPr(2))(3)](-)). X-ray diffraction (XRD) studies of these carbonyl complexes establish little geometrical change about the iron center as a function of oxidation state. It is possible to functionalize the t...

Libraries of lanthanide complexes supported by nitrogen and oxygen containing ligands have been synthesised using a high-throughput approach. The complexes were employed in the ring-opening polymerisation of epsilon-caprolactone, in some cases giving polycaprolactone of controlled molecular weight and narrow polydispersity. The libraries, based on twenty-one ligands and eight lanthanide reagent...

[1] Analysis of ERA40 temperature and accumulation data suggests that annual mean isotopic fluctuations due to temperature change will be geographically very variable across the Peninsula: isotopic variations of 0.4% at James Ross Island; 0.9% at Dyer; and 1.3% at Gomez are all likely to indicate an identical magnitude of temperature change. The reduction in the magnitude of the isotopic signal...

Eight bis(salicylaldiminato)tin(II) complexes have been synthesized from the reaction of Sn[N(SiMe(3))(2)](2) and 2 equiv of the corresponding ligands at room temperature. The ligands, synthesized from salicylaldehyde and amines, were designed to have different electronic and steric properties using different amines to synthesize the tin(II) complexes as aniline (2a), 2,6-dimethylaniline (2b), ...

A series of germylene, stannylene and plumbylene complexes [η(2)(N,N)-Me(2)Si(DippN)(2)Ge:] (3a), [η(2)(N,N)-Ph(2)Si(DippN)(2)Ge:] (3b), [η(2)(N,N)-Me(2)Si(DippN)(2)Sn:] (4), [η(2)(N,N)-Me(2)Si(DippN)(2)Pb:](2) (5a), and [η(2)(N,N)-Ph(2)Si(DippN)(2)Pb:] (5b) (Dipp = 2,6-iPr(2)C(6)H(3)) bearing bulky bis(amido)silane ligands were readily prepared either by the transamination of M[N(SiMe(3))(2)](...

The first example of a tetrahalogenated derivative of a diphosphadithiatetrazocine, 1,5-Cl(2)P(NSN)(2)PCl(2) (3), was synthesized by cyclocondensation of a 2:1 mixture of SCl(2) and SO(2)Cl(2) with Cl(2)P(NSiMe(3))N(SiMe(3))(2) in CH(2)Cl(2). The heterocycle 3 was isolated as an orange, moisture-sensitive, thermally labile solid and characterized by mass spectrometry, (31)P NMR, and UV-visible ...