Group 4 phosphorus-bridged

Group 4 Phosphorus-Bridged ansa-Metallocene Complexes. 145... 

Performing the reduction of the dichloride under an argon rather than dinitrogen atmosphere affords a phosphorus-bridged dizirconium complex where the bridging phenyl groups are reduced to bis(allyl) anions (341, Scheme 56).205 Addition of aryl alkynes to 338 offers another method of dinitrogen functionalization,... 

Nitrogen and Phosphorus Derivatives of Bivalent Tin and Lead. Following the first syntheses of tin(ii)- and lead(ii)-nitrogen bonds in 1974, Zeldin has reported the preparation and properties of bis(dimethylamino)tin(n). The compound is a white crystalline solid which is dimeric in cyclohexane solution, but monomeric in the vapour. Variable-temperature n.m.r. studies in chlorobenzene solution indicate exchange of dimethylamino-groups between bridge and terminal positions of the dimer structure (77). With pyridine, a 1 1 adduct is formed alcohols and... 

Polyferrocenylphenylphosphines 3.29, analogous to those previously synthesized by polycondensation routes (Section 3.2.2), have also been prepared by thermal ROP of phosphorus-bridged [l]ferrocenophanes 3.28 (Eq. 3.13) [72]. The solubility of the materials was observed to increase when the cyclopentadienyl rings were substituted with n-butyl or trimethylsUyl groups. Sulfurization was carried out in order to facilitate their characterization by GPC, as the polyferrocenylphosphine... 

Bifunctional reagents can give either spiroeyclic pendant group attachment, bridging to adjacent phosphorus atoms on the same... 

The reaction of [LSi(TMS)=P(TMS)] (3) with [NifCODlzl generates a novel phosphorus-bridged bis(silylene) nickel complex [ (LSi)2P(TMS) Ni(COD)] with a tricoordinate phosphine substituted with a IMS group (Scheme 8.2.1) (4). 

The reactions of the six-membered chlorocyclophosphazene were studied with a number of aliphatic diamines (169 175), aromatic diamines (176), aliphatic diols (177-179), aromatic diols (180,181) and compounds containing amino and hydroxyl functional groups (169,170,182). This subject has been reviewed (11,16,20). There are at least five different reaction products that are possible (Fig. 19). Replacement of two chlorine atoms from the same phosphorus atom produces a spirocyclic product. Replacement of two chlorine atoms from two different phosphorus atoms in the same molecule produces an ansa product. Reaction of only one end of the difunctional reagent, resulting in the substitution of only one chlorine atom, leads to an open-chain compound. Intermolecular bridged compounds are formed when the difunc-... 

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