Synthesis and structural characterisation of the first example of a 3, 3′-diphospha-1,1′-biphospholyl ring system; crystal and molecular structure of P₄C₆Bu^t₆

An Approach to Mixed PnAsm Ligand Complexes

“…A similar disorder of occupancy was described for [CpFe(η 5 ‐C 2 t Bu 2 AsP 2 )W(CO) 5 ] 18. The PAs bond in this pseudo E n ‐ligand complex (2.161(3) Å) is slightly longer than in 3 .…”

Triphospholes as2e and4e donors: Synthesis and structural characterization of the 1,2,4-triphosphole complexes ?1-trans-[PtCl2(PEt3)(P3C2But2CH(SiMe3)2] and ?1-?1-trans-[PtCl2(PEt3)2}2(?-P3C2But2CH(SiMe3)2]

“…Both Pt(1)-P(4) and Pt (2) (2) and (1), the molecular structure of (3) is the only one that shows the bond lengths expected for the presence of a diene fragment. The two P‫ס‬C double bonds P(2)-C(2) and P(3)-C(1) [1.665(11) Å and 1.667(10) Å , respectively] are the shortest of the three compounds and lie in the same range as those previously reported (1.64-1.69 Å ) [9][10][11][12][13][14][15]. Compound (3) also shows the longest P-C [P(3)-C(2) ‫ס‬ 1.797(10) Å and P(1)-C(1) ‫ס‬ 1.832(9) Å ] distances, which are comparable with those values expected for P-C (1.78-1.92 Å ); likewise, the [P(1)-P(2)] ‫ס‬ 2.172(4) Å distance is that …”

“…expected for a single bond [typically, 2.171-2.266 Å ] [15,16]. The ring [P(1)P(2)C(1)P(3)C (2)] is planar in (3), while in (1) and (2) only the atoms from the diene system [P(2)C(1)P(3)C (2)] lie in the same plane.…”

Progress in Polyarsolyl Chemistry

“…Similar synthetic approaches only result in the formation of the [As(C t Bu)] 4 cubane . Only the mixed heterocycle [AsP 2 (C t Bu) 2 ] − is known, with structural characterization being made possible through coordination to a W(CO) 5 fragment in [CpFe{AsP 2 (C t Bu) 2 }W(CO) 5 ] . Different approaches are needed for the synthesis of the also very rare 1,2,3‐isomers IV , that is, starting from phosphines or reactions of alkynes either with P 4 butterfly complexes or with the Zintl anions [E 7 ] 3− (E=P, As) .…”