Tetra-tert-butylcyclotetraphosphane, [PC(CH3)3]4

Weigand, Wilhelm; Cordes, A. W.; Swepston, P. N.

doi:10.1107/s0567740881006754

Cited by 39 publications

(14 citation statements)

References 5 publications

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“…[26] The endocyclic P-P-P angles span the range from 78.99(5)°(P4) to 84.35(5)°(P3) and are compatible with those of other cyclotetraphosphanes. [25][26][27][28] The fourmembered ring is not uniformly bent, however, as the nonbonding P-P distances are 3.6 Å for P2-P4 and 2.8 Å for P1-P3. Table 9.…”

Section: X-ray Structuresmentioning

confidence: 96%

See 1 more Smart Citation

N‐(2,4,6‐Trimethylborazinyl)‐Substituted Phosphanes, Arsanes, and Stibanes

2007

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Reaction of the N‐lithioborazine LiH2N3B3Me3·OEt2 (2) in diethyl ether with PCl3 or PBr3 leads to the borazinylphosphanes (Me3B3N3H2)PX2, (Me3B3N3H2)2PX (X = Cl, Br), and (Me3B3N3H2)3P, depending on the initial stoichiometry. The analogous arsane and stibane derivatives were obtained in a similar manner. While (Me3B3N3H2)2PBr is reduced byLiAlH4 in diethyl ether/hexane to give the monophosphane (Me3B3N3H2)2PH (13), the reaction of (Me3B3N3H2)PBr2 (5) with LiAlH4 in diethyl ether/hexane produces the zwitterionic compound [Me3B3N2(HN)]–P+H2Et (14). Dehalogenation of (Me3B3N3H2)2PBr (6) with Na yields the diphosphane (Me3B3N3H2)2PP(H2N3B3Me3)2 (18), while the mixed diphosphane (Me3B3N3H)2PPmes2 (17) is obtained from 6 and LiPmes2. Dehalogenation of Me3B3N3H2PBr2 with Na results in the exclusive formation of (Me3B3N3H2)4P4 (19), while the reaction of 5 with Li2Pmes leads to a mixture of cyclotetraphosphanes (mes)4–n(Me3B3N3H2)nP4 (A–F) along with bicyclic P4mes2. The new compounds have been characterized by NMR and IR spectroscopy and partly by mass spectrometry. X‐ray structures for compounds, 4, 5, 6, 9, 13, 14, 17, 18, 19, and E have been determined. All show different B–N bond lengths within the borazine rings, and some have borazine rings in a half‐chair conformation.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

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Section: X-ray Structuresmentioning

confidence: 96%

“…[25][26][27][28] The rings at atoms P1 and P3 are twisted against each other by 20°while those at atoms P2 and P4 make an angle of 93°. Amongst the P-P bonds, those to atom P4 are significantly longer than those to atom P2.…”

Section: X-ray Structuresmentioning

confidence: 99%

N‐(2,4,6‐Trimethylborazinyl)‐Substituted Phosphanes, Arsanes, and Stibanes

2007

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“…The most important feature of the crystal structure analysis is the nonplanar ring system. As in other cyclotetraphosphanes [13,14], the substituents at the phosphorus atom are arranged in an "all-trans" configuration. This means that the exocyclic groups are orientated so that each phosphorus atom and its bis(trimethylsilyl)methyl group lie on opposite sides of the central best plane.…”

Section: Hydrostannylation Of Phosphaalkene 11 With Triorganotin Hydrmentioning

confidence: 98%

“…This is due to the steric effects of the voluminous bis(trimethylsilyl)methyl groups. The P-P bond lengths are in the normal range for P/P single bonds in cyclic polyphosphanes [13][14][15].…”

Section: Hydrostannylation Of Phosphaalkene 11 With Triorganotin Hydrmentioning

confidence: 99%

Hydrostannylation of phosphaalkenes [1]

Schmitz¹,

Leininger²,

Bergsträßer³

et al. 1998

Heteroatom Chem.

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Hydrostannylation reactions of the phosphaalkenes 9,11, and 21 with the triorganotin hydrides 1 proceed by different routes. Whereas the trior‐ganotin hydrides 1a,b undergo regioselective 1,2‐addition to the P/C double bond of the P‐aminophosphaalkene 9 to furnish the 2‐stannylphosphanes 17a,b, the 1,2‐addition products to the P‐halophosphaalkenes 11 and 21 can only be postulated as the reactive intermediates 20 and 23, respectively. The reactions of 11 with 1a,b proceed with cleavage of the triorganotin halide via the diphosphene 15 to furnish the cyclophosphanes 18 and 19. On the other hand, the hydrostannylation reactions of the phosphaalkene 21 are not selective, and the 1,3‐diphosphetane 22 is isolated as one of the reaction products. © 1998 John Wiley & Sons, Inc. Heteroatom Chem 9:453–460, 1998

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“…Among the numerous polyphosphorus compounds (Baundler & Glinka, 1993, and references therein) the following cyclic organophosphanes with the empirical formula (PR)4 have been structurally characterized: [P{2-(MeO)C6H4}]4 (Heuer, Sell, Schmutzler & Schomburg, 1987), [P{CH2P(S)F2}]4 (Fild, Bunke & Schomburg, 1988), [P(C6H,,)]4 (Bart, 1969), [P(CF3)]4 (Palenik & Donohue, 1962), [P(C6Fs)]4 (Sanz & Daly, 1971) and [P'Bu]4 (Weigand, Cordes & Swepston, 1981), bond distances and angles of which are in good agreement with those of (1 b). …”

Section: Commentmentioning

confidence: 99%