Halogeno donor

Photoaddhion of electron donor olefins such as vinyl ethers and stilbene to variously methyl and halogeno-substituted 1,4-benzoquinones resulted in the formation of dihydrobenzofurans via a dienone-phenol rearrangement of the primary product spirooxetanes <96H(43)619>. High-temperature water seems to be an alternative to use of acid catalysts or organic solvents by the cyclization of allyl phenyl ethers to dihydrobenzofurans <96JOC7355>. 

Halogeno-complexes. This section includes studies on oxy- and thio-halide species, and 1 1 halide adducts with a variety of donor atoms. Phase diagrams for the HF-NbFj and HF-TaFj systems have been presented. The anti-... 

S- and P-donor ligands. The complexes [(YPPh2 CH PPh2Y)2Fe] (Y = S or Se) are prepared by treating (Ph2PY)2CH with Bu"Li, followed by addition of an Fe" halogeno-complex anion. The complexes are both tetrahedral and the Se complex is the first example of tetrahedral co-ordination of Se to Fe". ... 

Rhodium(i).—Group VII Donors. Halogeno-carbonyl and -phosphine complexes. Convenient atmospheric pressure syntheses have been reported for the complexes [RhCI(PF3)2]2 and [Rh(acac)2(PF3)2], by replacing olefins from suitable substrate complexes, e.g. 

Among the CF parameters the octahedral A = 10Dq splitting parameter plays a central role. It exhibits a systematic variation according to a spec-trochemical series of ligands (Table 42) halogeno-ions and O-donor ligands... 

Osmium(n).—Group VII Donors. Hydrido- and halogeno-carbonyl complexes. Carbonylation of [OsHX(CO)(PCy3)2] has produced the novel dicarbonyl hydride [OsHX(CO)2(PCy3)2] (X = Cl or Br Cy = tricyclohexyl).17 I.r. and n.m.r. data indicate the geometry (17). Addition of other ligands to the five-co-ordinate... 

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