4,6-Bis(diphenyl­phosphino)phenoxazine (nixantphos)

Marimuthu, T.; Bala, M.D.; Friedrich, H.B.

doi:10.1107/S1600536808006648

organic compounds

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ISSN: 2056-9890

Volume 64| Part 4| April 2008| Page o711

doi:10.1107/S1600536808006648

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4,6-Bis(diphenylphosphino)phenoxazine (nixantphos)

Thashree Marimuthu,^a Muhammad D. Bala ^a ^* and Holger B. Friedrich ^a

^aSchool of Chemistry, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4000, South Africa
^*Correspondence e-mail: bala@ukzn.ac.za

(Received 3 March 2008; accepted 10 March 2008; online 14 March 2008)

The title compound, C₃₆H₂₇NOP₂, has been reported as a ligand on rhodium for the catalysis of hydroformylation reactions. The key feature of the compound is the intramolecular P⋯P distance of 4.255 (2) Å. The bond angles at the P atoms range from 99.93 (10) to 103.02 (10)°. The phenoxazine ring system is essentially planar and a non-crystallographic mirror plane through the N⋯O vector bisects the molecule. The C—O bond lengths range from 1.388 (2) to 1.392 (2) Å and the C—N bond lengths range from 1.398 (3) to 1.403 (3) Å.

Related literature

For related literature, see: Antonio et al. (1989 ); Claver & van Leeuwen (2000 ); Deprele & Montchamp (2004 ); van Leeuwen et al. (2002 ); Osiński et al. (2005 ); Petrassi et al. (2000 ); Ricken et al. (2006a ,b ,c ); Sandee et al. (1999 , 2001 ); Tolman (1977 ); van der Veen et al. (2000 ).

Experimental

Crystal data

C₃₆H₂₇NOP₂
M_r = 551.53
Triclinic, $[P \overline 1]$
a = 10.4233 (3) Å
b = 10.9113 (3) Å
c = 12.9940 (4) Å
α = 104.055 (2)°
β = 102.555 (2)°
γ = 97.459 (2)°
V = 1373.04 (7) Å³
Z = 2
Mo Kα radiation
μ = 0.19 mm⁻¹
T = 173 (2) K
0.40 × 0.18 × 0.12 mm

Data collection

Bruker APEXII CCD area-detector diffractometer
Absorption correction: none
15968 measured reflections
5396 independent reflections
3646 reflections with I > 2σ(I)
R_int = 0.055

Refinement

R[F² > 2σ(F²)] = 0.043
wR(F²) = 0.105
S = 0.95
5396 reflections
365 parameters
H atoms treated by a mixture of independent and constrained refinement
Δρ_max = 0.38 e Å⁻³
Δρ_min = −0.29 e Å⁻³

Data collection: APEX2 (Bruker, 2005 ); cell refinement: SAINT-NT (Bruker, 2005); data reduction: SAINT-NT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008 ); program(s) used to refine structure: SHELXTL; molecular graphics: PLATON (Spek, 2003 ) and ORTEP-3 (Farrugia, 1997 ); software used to prepare material for publication: SHELXTL.

Supporting information

Crystal structure: contains datablocks global, I. DOI: 10.1107/S1600536808006648/dn2322sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536808006648/dn2322Isup2.hkl

checkCIF report

Comment top

The titled compound, (1) (Fig. 1), is a xanthene based diphenylphosphine ligand. The synthesis of the ligand has been reported in literature (van der Veen et al., 2000; Petrassi et al., 2000; Antonio et al., 1989), in addition it is commercially available and has been used extensively in synthesis and as a precursor for the synthesis of substituted bis(diphenylphoshino)phenoxazine ligands (Osiński et al., 2005; Ricken et al., 2006a,b). However, this is the first time that the crystal structure is being reported. This ligand and similar xantphos based ligands have been used on Rh as catalysts for the regioselective hydroformylation of 1-octene to octanal (Claver & van Leeuwen, 2000; van der Veen et al., 2000). Moreover, (1) has been successfully immobilized on silica (Sandee et al., 2001, 1999; van Leeuwen et al., 2002), polystyrene (Deprele & Montchamp, 2004), and dendritic supports (Ricken et al., 2006a).

The title compound (1) was prepared following literature procedures (Antonio et al., 1989; Petrassi et al., 2000) as part of our ongoing investigation of scorpionate-type ligands by the alkylation of the amine. The structural elucidation of this compound allows for the determination of important ligand factors such as the cone angle (Tolman, 1977), and the flexibility range of the natural bite angle (van der Veen et al., 2000). It is also useful for studies of the coordination chemistry and catalytic applications of xantphos-type ligands. For example, the intramolecular P···P distance of 4.255 Å for (1) is similar to values reported for nixantphos-type ligands functionalized at the nitrogen (Osiński, et al., 2005; Ricken et al., 2006a,c) indicating that a functionality at N has little influence on the bite angle of the ligand.

Related literature top

For related literature, see: Antonio et al. (1989); Claver & van Leeuwen (2000); Deprele & Montchamp (2004); van Leeuwen et al. (2002); Osiński et al. (2005); Petrassi et al. (2000); Ricken et al. (2006a,b,c); Sandee et al. (1999, 2001); Tolman (1977); van der Veen et al. (2000).

Experimental top

The compound was synthesized via a three step procedure adapted from literature (Antonio et al., 1989; Petrassi et al., 2000; van der Veen et al., 2000). Yield: 70% of yellow crystals of (1), m.p. 457–459 K. Spectroscopic analysis: ¹H NMR (600 MHz, CDCl₃, δ, p.p.m): 5.16 (s, 1H; NH), 5.97 (d, 2H; J(H,H) = 6.4 Hz,), 6.34 (bd, 2H;J(H,H) = 7.3 Hz,), 6.58 (t, 2H J(H,H) = 7.7 Hz), 7.17–7.23 (bs, 20H). ¹³C NMR (600 MHz, CDCl₃, δ, p.p.m): 113.7(CH), 123.7(CH), 125.8(CH), 128.1(CH), 128.2(CH), 128.3(C), 128.3 (C), 131.3(bs,CN), 133.9(CH), 134.0(C), 136.7 (C). ³¹P NMR (600 MHz, CDCl₃, δ, p.p.m): -19.0 MS m/z (%): 552.1633 (M + H) calculated = 552.1648 for C₃₆H₂₇NOP₂ Elemental Analysis: C, 78.01; H, 4.95; N, 2.47. Found: C, 77.61; H, 4.91; N,2.41. FTIR: cm^-1 = 3408(w), (NH), 1565(s), 1452(s), 1398(s), 1286, CN,1256(m), 1206(m), 1090(m), 766(m), 739(m), (NH), 723(m), 690(s).

Computing details top

Data collection: APEX2 (Bruker, 2005); cell refinement: SAINT-NT (Bruker, 2005); data reduction: SAINT-NT (Bruker, 2005); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2003) and ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top

Fig. 1. Molecular structure of the title complex with the atom labelling scheme. Ellipsoids are drawn at the 50% probability level.

4,6-Bis(diphenylphosphino)phenoxazine top

Crystal data top

C₃₆H₂₇NOP₂	Z = 2
M_r = 551.53	F(000) = 576
Triclinic, P1	D_x = 1.334 Mg m⁻³
Hall symbol: -P 1	Melting point: 457(2) K
a = 10.4233 (3) Å	Mo Kα radiation, λ = 0.71073 Å
b = 10.9113 (3) Å	Cell parameters from 3152 reflections
c = 12.9940 (4) Å	θ = 2.2–25.5°
α = 104.055 (2)°	µ = 0.19 mm⁻¹
β = 102.555 (2)°	T = 173 K
γ = 97.459 (2)°	Triangular, yellow
V = 1373.04 (7) Å³	0.40 × 0.18 × 0.12 mm

Data collection top

Bruker SMART CCD area-detector diffractometer	3646 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	R_int = 0.055
Graphite monochromator	θ_max = 26.0°, θ_min = 1.7°
ϕ and ω scans	h = −10→12
15968 measured reflections	k = −13→13
5396 independent reflections	l = −16→16

Refinement top

Refinement on F²	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F² > 2σ(F²)] = 0.043	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.106	H atoms treated by a mixture of independent and constrained refinement
S = 0.95	w = 1/[σ²(F_o²) + (0.048P)²] where P = (F_o² + 2F_c²)/3
5396 reflections	(Δ/σ)_max = 0.001
365 parameters	Δρ_max = 0.38 e Å⁻³
0 restraints	Δρ_min = −0.30 e Å⁻³

Crystal data top

C₃₆H₂₇NOP₂	γ = 97.459 (2)°
M_r = 551.53	V = 1373.04 (7) Å³
Triclinic, P1	Z = 2
a = 10.4233 (3) Å	Mo Kα radiation
b = 10.9113 (3) Å	µ = 0.19 mm⁻¹
c = 12.9940 (4) Å	T = 173 K
α = 104.055 (2)°	0.40 × 0.18 × 0.12 mm
β = 102.555 (2)°

Data collection top

Bruker SMART CCD area-detector diffractometer	3646 reflections with I > 2σ(I)
15968 measured reflections	R_int = 0.055
5396 independent reflections

Refinement top

R[F² > 2σ(F²)] = 0.043	0 restraints
wR(F²) = 0.106	H atoms treated by a mixture of independent and constrained refinement
S = 0.95	Δρ_max = 0.38 e Å⁻³
5396 reflections	Δρ_min = −0.30 e Å⁻³
365 parameters

Special details top

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.

Refinement. Refinement of F² against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F², conventional R-factors R are based on F, with F set to zero for negative F². The threshold expression of F² > σ(F²) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F² are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
C1	0.0632 (2)	0.3597 (2)	0.56267 (18)	0.0339 (5)
C2	0.1275 (2)	0.4755 (2)	0.63818 (19)	0.0391 (6)
H2	0.1111	0.4968	0.7089	0.047*
C3	0.2159 (2)	0.5608 (2)	0.61113 (19)	0.0401 (6)
H3	0.2593	0.6407	0.6633	0.048*
C4	0.2414 (2)	0.5308 (2)	0.50922 (19)	0.0347 (5)
H4	0.3029	0.5900	0.4921	0.042*
C5	0.1780 (2)	0.41454 (19)	0.43100 (17)	0.0288 (5)
C6	0.0885 (2)	0.33272 (19)	0.45990 (18)	0.0300 (5)
C7	−0.0601 (2)	0.1287 (2)	0.40544 (18)	0.0307 (5)
C8	−0.1125 (2)	0.0139 (2)	0.32431 (18)	0.0311 (5)
C9	−0.1946 (2)	−0.0809 (2)	0.34914 (19)	0.0350 (5)
H9	−0.2323	−0.1612	0.2954	0.042*
C10	−0.2214 (2)	−0.0594 (2)	0.4502 (2)	0.0393 (6)
H10	−0.2765	−0.1250	0.4660	0.047*
C11	−0.1690 (2)	0.0565 (2)	0.5287 (2)	0.0395 (6)
H11	−0.1897	0.0709	0.5978	0.047*
C12	−0.0863 (2)	0.1525 (2)	0.50796 (19)	0.0341 (5)
C21	0.3147 (2)	0.50031 (19)	0.28652 (17)	0.0283 (5)
C22	0.2595 (2)	0.6054 (2)	0.2703 (2)	0.0390 (6)
H22	0.1680	0.6049	0.2692	0.047*
C23	0.3343 (2)	0.7100 (2)	0.2558 (2)	0.0415 (6)
H23	0.2950	0.7818	0.2470	0.050*
C24	0.4657 (2)	0.7113 (2)	0.25396 (19)	0.0400 (6)
H24	0.5171	0.7829	0.2424	0.048*
C25	0.5217 (2)	0.6081 (2)	0.2690 (2)	0.0423 (6)
H25	0.6126	0.6084	0.2679	0.051*
C26	0.4479 (2)	0.5037 (2)	0.28585 (19)	0.0351 (5)
H26	0.4888	0.4335	0.2971	0.042*
C31	0.3144 (2)	0.24846 (18)	0.31367 (17)	0.0280 (5)
C32	0.4063 (2)	0.26320 (19)	0.41242 (18)	0.0329 (5)
H32	0.4126	0.3345	0.4734	0.040*
C33	0.4891 (2)	0.1757 (2)	0.4233 (2)	0.0401 (6)
H33	0.5516	0.1867	0.4916	0.048*
C34	0.4812 (2)	0.0733 (2)	0.3362 (2)	0.0450 (6)
H34	0.5383	0.0131	0.3440	0.054*
C35	0.3916 (3)	0.0568 (2)	0.2377 (2)	0.0479 (7)
H35	0.3872	−0.0142	0.1770	0.057*
C36	0.3075 (2)	0.1434 (2)	0.2262 (2)	0.0385 (6)
H36	0.2445	0.1309	0.1579	0.046*
C41	−0.1440 (2)	−0.1688 (2)	0.12171 (18)	0.0346 (5)
C42	−0.0664 (3)	−0.2619 (2)	0.1300 (2)	0.0457 (6)
H42	0.0234	−0.2367	0.1738	0.055*
C43	−0.1170 (3)	−0.3900 (2)	0.0759 (2)	0.0570 (8)
H43	−0.0627	−0.4525	0.0831	0.068*
C44	−0.2466 (3)	−0.4270 (2)	0.0113 (2)	0.0568 (8)
H44	−0.2820	−0.5152	−0.0263	0.068*
C45	−0.3243 (3)	−0.3372 (2)	0.0015 (2)	0.0567 (7)
H45	−0.4137	−0.3629	−0.0432	0.068*
C46	−0.2737 (2)	−0.2084 (2)	0.0563 (2)	0.0465 (6)
H46	−0.3288	−0.1467	0.0488	0.056*
C51	−0.1711 (2)	0.09115 (19)	0.13194 (18)	0.0325 (5)
C52	−0.1280 (2)	0.1525 (2)	0.0605 (2)	0.0459 (6)
H52	−0.0439	0.1441	0.0455	0.055*
C53	−0.2058 (3)	0.2257 (3)	0.0107 (2)	0.0557 (7)
H53	−0.1746	0.2680	−0.0375	0.067*
C54	−0.3276 (3)	0.2372 (2)	0.0307 (2)	0.0525 (7)
H54	−0.3819	0.2858	−0.0052	0.063*
C55	−0.3718 (3)	0.1792 (2)	0.1020 (2)	0.0453 (6)
H55	−0.4559	0.1887	0.1166	0.054*
C56	−0.2939 (2)	0.1070 (2)	0.15255 (19)	0.0386 (6)
H56	−0.3249	0.0674	0.2025	0.046*
N1	−0.0284 (2)	0.27159 (19)	0.58580 (18)	0.0414 (5)
H1	−0.018 (3)	0.277 (3)	0.655 (2)	0.079 (11)*
O1	0.02287 (15)	0.21948 (13)	0.37894 (12)	0.0384 (4)
P1	0.20112 (5)	0.36083 (5)	0.29234 (5)	0.03016 (16)
P2	−0.06220 (6)	−0.00273 (5)	0.19630 (5)	0.03407 (16)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1	0.0333 (13)	0.0373 (13)	0.0362 (14)	0.0149 (10)	0.0118 (11)	0.0126 (10)
C2	0.0404 (14)	0.0482 (14)	0.0305 (14)	0.0187 (11)	0.0101 (11)	0.0078 (11)
C3	0.0358 (13)	0.0364 (13)	0.0387 (15)	0.0118 (11)	0.0014 (11)	−0.0018 (11)
C4	0.0260 (12)	0.0330 (12)	0.0406 (14)	0.0056 (9)	0.0035 (10)	0.0066 (10)
C5	0.0252 (11)	0.0298 (11)	0.0323 (13)	0.0114 (9)	0.0042 (10)	0.0100 (9)
C6	0.0275 (11)	0.0285 (11)	0.0325 (13)	0.0092 (9)	0.0058 (10)	0.0057 (9)
C7	0.0253 (11)	0.0354 (12)	0.0376 (14)	0.0088 (9)	0.0108 (10)	0.0177 (10)
C8	0.0231 (11)	0.0348 (12)	0.0363 (13)	0.0068 (9)	0.0041 (10)	0.0142 (10)
C9	0.0246 (12)	0.0394 (13)	0.0404 (14)	0.0024 (9)	0.0038 (10)	0.0161 (10)
C10	0.0285 (12)	0.0452 (14)	0.0503 (16)	0.0036 (10)	0.0099 (11)	0.0267 (12)
C11	0.0325 (13)	0.0562 (16)	0.0419 (15)	0.0157 (11)	0.0179 (11)	0.0251 (12)
C12	0.0312 (12)	0.0396 (13)	0.0378 (14)	0.0139 (10)	0.0113 (11)	0.0167 (11)
C21	0.0295 (12)	0.0278 (11)	0.0261 (12)	0.0030 (9)	0.0050 (9)	0.0077 (9)
C22	0.0348 (13)	0.0386 (13)	0.0498 (16)	0.0118 (10)	0.0137 (11)	0.0188 (11)
C23	0.0503 (15)	0.0314 (13)	0.0462 (15)	0.0139 (11)	0.0113 (12)	0.0151 (11)
C24	0.0403 (14)	0.0307 (12)	0.0446 (15)	−0.0036 (10)	0.0051 (11)	0.0130 (11)
C25	0.0273 (12)	0.0406 (14)	0.0569 (17)	0.0009 (10)	0.0057 (11)	0.0174 (12)
C26	0.0293 (12)	0.0290 (12)	0.0462 (15)	0.0044 (9)	0.0051 (11)	0.0141 (10)
C31	0.0272 (11)	0.0237 (11)	0.0336 (13)	0.0002 (8)	0.0110 (10)	0.0085 (9)
C32	0.0359 (13)	0.0277 (11)	0.0355 (14)	0.0068 (9)	0.0093 (11)	0.0091 (9)
C33	0.0360 (13)	0.0389 (13)	0.0486 (16)	0.0067 (10)	0.0092 (12)	0.0201 (12)
C34	0.0409 (14)	0.0321 (13)	0.0689 (19)	0.0132 (11)	0.0205 (14)	0.0182 (12)
C35	0.0511 (16)	0.0307 (13)	0.0604 (19)	0.0103 (11)	0.0233 (14)	0.0007 (12)
C36	0.0361 (13)	0.0352 (13)	0.0388 (14)	0.0006 (10)	0.0091 (11)	0.0040 (10)
C41	0.0373 (13)	0.0336 (12)	0.0352 (14)	0.0092 (10)	0.0109 (11)	0.0112 (10)
C42	0.0488 (15)	0.0455 (15)	0.0458 (16)	0.0169 (12)	0.0128 (13)	0.0140 (12)
C43	0.080 (2)	0.0410 (16)	0.0562 (19)	0.0263 (14)	0.0215 (16)	0.0142 (13)
C44	0.088 (2)	0.0299 (14)	0.0496 (18)	0.0051 (14)	0.0203 (16)	0.0068 (12)
C45	0.0572 (17)	0.0420 (15)	0.0559 (18)	0.0010 (13)	0.0041 (14)	0.0000 (13)
C46	0.0469 (15)	0.0356 (14)	0.0483 (16)	0.0065 (11)	0.0024 (13)	0.0055 (11)
C51	0.0355 (13)	0.0271 (11)	0.0303 (13)	−0.0020 (9)	0.0055 (10)	0.0062 (9)
C52	0.0444 (15)	0.0511 (15)	0.0436 (16)	0.0021 (12)	0.0138 (12)	0.0174 (12)
C53	0.0628 (19)	0.0604 (18)	0.0529 (18)	0.0077 (14)	0.0145 (15)	0.0351 (14)
C54	0.0589 (18)	0.0488 (16)	0.0542 (18)	0.0128 (13)	0.0074 (14)	0.0275 (13)
C55	0.0464 (15)	0.0447 (14)	0.0494 (17)	0.0136 (12)	0.0121 (13)	0.0192 (12)
C56	0.0408 (14)	0.0406 (13)	0.0399 (14)	0.0094 (11)	0.0126 (11)	0.0189 (11)
N1	0.0534 (13)	0.0434 (12)	0.0354 (13)	0.0145 (10)	0.0226 (11)	0.0132 (10)
O1	0.0460 (10)	0.0326 (8)	0.0359 (9)	−0.0022 (7)	0.0180 (8)	0.0069 (7)
P1	0.0261 (3)	0.0298 (3)	0.0338 (3)	0.0032 (2)	0.0063 (3)	0.0100 (2)
P2	0.0288 (3)	0.0356 (3)	0.0365 (4)	0.0035 (2)	0.0078 (3)	0.0096 (3)

Geometric parameters (Å, º) top

C1—C2	1.379 (3)	C31—C36	1.386 (3)
C1—C6	1.386 (3)	C31—P1	1.836 (2)
C1—N1	1.398 (3)	C32—C33	1.379 (3)
C2—C3	1.384 (3)	C32—H32	0.9500
C2—H2	0.9500	C33—C34	1.363 (3)
C3—C4	1.377 (3)	C33—H33	0.9500
C3—H3	0.9500	C34—C35	1.366 (3)
C4—C5	1.394 (3)	C34—H34	0.9500
C4—H4	0.9500	C35—C36	1.383 (3)
C5—C6	1.381 (3)	C35—H35	0.9500
C5—P1	1.833 (2)	C36—H36	0.9500
C6—O1	1.392 (2)	C41—C46	1.381 (3)
C7—C8	1.382 (3)	C41—C42	1.387 (3)
C7—O1	1.386 (2)	C41—P2	1.826 (2)
C7—C12	1.387 (3)	C42—C43	1.377 (3)
C8—C9	1.400 (3)	C42—H42	0.9500
C8—P2	1.825 (2)	C43—C44	1.376 (4)
C9—C10	1.372 (3)	C43—H43	0.9500
C9—H9	0.9500	C44—C45	1.362 (3)
C10—C11	1.374 (3)	C44—H44	0.9500
C10—H10	0.9500	C45—C46	1.384 (3)
C11—C12	1.384 (3)	C45—H45	0.9500
C11—H11	0.9500	C46—H46	0.9500
C12—N1	1.403 (3)	C51—C52	1.384 (3)
C21—C26	1.385 (3)	C51—C56	1.388 (3)
C21—C22	1.388 (3)	C51—P2	1.828 (2)
C21—P1	1.831 (2)	C52—C53	1.380 (3)
C22—C23	1.372 (3)	C52—H52	0.9500
C22—H22	0.9500	C53—C54	1.365 (3)
C23—C24	1.374 (3)	C53—H53	0.9500
C23—H23	0.9500	C54—C55	1.366 (3)
C24—C25	1.369 (3)	C54—H54	0.9500
C24—H24	0.9500	C55—C56	1.377 (3)
C25—C26	1.380 (3)	C55—H55	0.9500
C25—H25	0.9500	C56—H56	0.9500
C26—H26	0.9500	N1—H1	0.86 (3)
C31—C32	1.384 (3)

C2—C1—C6	118.3 (2)	C31—C32—H32	119.6
C2—C1—N1	122.0 (2)	C34—C33—C32	120.0 (2)
C6—C1—N1	119.7 (2)	C34—C33—H33	120.0
C1—C2—C3	120.1 (2)	C32—C33—H33	120.0
C1—C2—H2	119.9	C33—C34—C35	120.3 (2)
C3—C2—H2	119.9	C33—C34—H34	119.8
C4—C3—C2	120.6 (2)	C35—C34—H34	119.8
C4—C3—H3	119.7	C34—C35—C36	120.1 (2)
C2—C3—H3	119.7	C34—C35—H35	120.0
C3—C4—C5	120.7 (2)	C36—C35—H35	120.0
C3—C4—H4	119.7	C35—C36—C31	120.5 (2)
C5—C4—H4	119.7	C35—C36—H36	119.8
C6—C5—C4	117.2 (2)	C31—C36—H36	119.8
C6—C5—P1	116.86 (15)	C46—C41—C42	117.8 (2)
C4—C5—P1	125.91 (18)	C46—C41—P2	125.83 (17)
C5—C6—C1	123.1 (2)	C42—C41—P2	116.31 (18)
C5—C6—O1	116.04 (19)	C43—C42—C41	121.4 (2)
C1—C6—O1	120.89 (19)	C43—C42—H42	119.3
C8—C7—O1	115.78 (19)	C41—C42—H42	119.3
C8—C7—C12	122.8 (2)	C44—C43—C42	119.7 (2)
O1—C7—C12	121.38 (19)	C44—C43—H43	120.2
C7—C8—C9	117.3 (2)	C42—C43—H43	120.2
C7—C8—P2	116.80 (16)	C45—C44—C43	120.0 (2)
C9—C8—P2	125.87 (17)	C45—C44—H44	120.0
C10—C9—C8	120.8 (2)	C43—C44—H44	120.0
C10—C9—H9	119.6	C44—C45—C46	120.4 (3)
C8—C9—H9	119.6	C44—C45—H45	119.8
C9—C10—C11	120.5 (2)	C46—C45—H45	119.8
C9—C10—H10	119.7	C41—C46—C45	120.8 (2)
C11—C10—H10	119.7	C41—C46—H46	119.6
C10—C11—C12	120.6 (2)	C45—C46—H46	119.6
C10—C11—H11	119.7	C52—C51—C56	117.8 (2)
C12—C11—H11	119.7	C52—C51—P2	118.61 (18)
C11—C12—C7	118.0 (2)	C56—C51—P2	123.61 (18)
C11—C12—N1	122.9 (2)	C53—C52—C51	120.9 (2)
C7—C12—N1	119.1 (2)	C53—C52—H52	119.6
C26—C21—C22	117.61 (19)	C51—C52—H52	119.6
C26—C21—P1	124.86 (16)	C54—C53—C52	120.0 (2)
C22—C21—P1	117.19 (16)	C54—C53—H53	120.0
C23—C22—C21	121.4 (2)	C52—C53—H53	120.0
C23—C22—H22	119.3	C53—C54—C55	120.4 (2)
C21—C22—H22	119.3	C53—C54—H54	119.8
C22—C23—C24	120.3 (2)	C55—C54—H54	119.8
C22—C23—H23	119.8	C54—C55—C56	119.7 (2)
C24—C23—H23	119.8	C54—C55—H55	120.1
C25—C24—C23	119.1 (2)	C56—C55—H55	120.1
C25—C24—H24	120.4	C55—C56—C51	121.2 (2)
C23—C24—H24	120.4	C55—C56—H56	119.4
C24—C25—C26	120.8 (2)	C51—C56—H56	119.4
C24—C25—H25	119.6	C1—N1—C12	119.7 (2)
C26—C25—H25	119.6	C1—N1—H1	115 (2)
C25—C26—C21	120.7 (2)	C12—N1—H1	119.0 (19)
C25—C26—H26	119.7	C7—O1—C6	118.82 (17)
C21—C26—H26	119.7	C21—P1—C5	101.96 (10)
C32—C31—C36	118.29 (19)	C21—P1—C31	102.20 (9)
C32—C31—P1	123.48 (15)	C5—P1—C31	99.98 (9)
C36—C31—P1	118.23 (17)	C8—P2—C41	100.81 (10)
C33—C32—C31	120.8 (2)	C8—P2—C51	99.93 (10)
C33—C32—H32	119.6	C41—P2—C51	103.02 (10)

C6—C1—C2—C3	−0.8 (3)	C41—C42—C43—C44	0.6 (4)
N1—C1—C2—C3	−178.9 (2)	C42—C43—C44—C45	−0.2 (4)
C1—C2—C3—C4	−0.5 (3)	C43—C44—C45—C46	−0.1 (4)
C2—C3—C4—C5	0.5 (3)	C42—C41—C46—C45	0.4 (4)
C3—C4—C5—C6	0.7 (3)	P2—C41—C46—C45	178.5 (2)
C3—C4—C5—P1	179.98 (16)	C44—C45—C46—C41	0.0 (4)
C4—C5—C6—C1	−2.0 (3)	C56—C51—C52—C53	−0.7 (3)
P1—C5—C6—C1	178.60 (16)	P2—C51—C52—C53	−179.29 (19)
C4—C5—C6—O1	177.72 (17)	C51—C52—C53—C54	−0.7 (4)
P1—C5—C6—O1	−1.7 (2)	C52—C53—C54—C55	1.6 (4)
C2—C1—C6—C5	2.1 (3)	C53—C54—C55—C56	−1.0 (4)
N1—C1—C6—C5	−179.71 (19)	C54—C55—C56—C51	−0.4 (4)
C2—C1—C6—O1	−177.62 (18)	C52—C51—C56—C55	1.3 (3)
N1—C1—C6—O1	0.6 (3)	P2—C51—C56—C55	179.79 (18)
O1—C7—C8—C9	178.75 (17)	C2—C1—N1—C12	−177.0 (2)
C12—C7—C8—C9	−0.3 (3)	C6—C1—N1—C12	4.9 (3)
O1—C7—C8—P2	1.3 (2)	C11—C12—N1—C1	174.5 (2)
C12—C7—C8—P2	−177.74 (16)	C7—C12—N1—C1	−5.5 (3)
C7—C8—C9—C10	0.1 (3)	C8—C7—O1—C6	−174.40 (17)
P2—C8—C9—C10	177.27 (16)	C12—C7—O1—C6	4.7 (3)
C8—C9—C10—C11	0.7 (3)	C5—C6—O1—C7	174.95 (17)
C9—C10—C11—C12	−1.3 (3)	C1—C6—O1—C7	−5.3 (3)
C10—C11—C12—C7	1.0 (3)	C26—C21—P1—C5	109.83 (19)
C10—C11—C12—N1	−178.9 (2)	C22—C21—P1—C5	−77.11 (18)
C8—C7—C12—C11	−0.2 (3)	C26—C21—P1—C31	6.7 (2)
O1—C7—C12—C11	−179.27 (18)	C22—C21—P1—C31	179.77 (17)
C8—C7—C12—N1	179.68 (19)	C6—C5—P1—C21	175.90 (15)
O1—C7—C12—N1	0.7 (3)	C4—C5—P1—C21	−3.4 (2)
C26—C21—C22—C23	−1.0 (3)	C6—C5—P1—C31	−79.23 (17)
P1—C21—C22—C23	−174.60 (19)	C4—C5—P1—C31	101.45 (18)
C21—C22—C23—C24	1.9 (4)	C32—C31—P1—C21	73.74 (19)
C22—C23—C24—C25	−1.3 (4)	C36—C31—P1—C21	−106.18 (18)
C23—C24—C25—C26	0.0 (4)	C32—C31—P1—C5	−30.94 (19)
C24—C25—C26—C21	0.8 (4)	C36—C31—P1—C5	149.14 (17)
C22—C21—C26—C25	−0.3 (3)	C7—C8—P2—C41	176.03 (16)
P1—C21—C26—C25	172.73 (18)	C9—C8—P2—C41	−1.1 (2)
C36—C31—C32—C33	0.1 (3)	C7—C8—P2—C51	−78.53 (17)
P1—C31—C32—C33	−179.82 (17)	C9—C8—P2—C51	104.31 (19)
C31—C32—C33—C34	0.2 (3)	C46—C41—P2—C8	87.2 (2)
C32—C33—C34—C35	0.1 (4)	C42—C41—P2—C8	−94.69 (19)
C33—C34—C35—C36	−0.6 (4)	C46—C41—P2—C51	−15.8 (2)
C34—C35—C36—C31	0.9 (4)	C42—C41—P2—C51	162.34 (18)
C32—C31—C36—C35	−0.7 (3)	C52—C51—P2—C8	151.05 (18)
P1—C31—C36—C35	179.27 (18)	C56—C51—P2—C8	−27.4 (2)
C46—C41—C42—C43	−0.7 (4)	C52—C51—P2—C41	−105.31 (19)
P2—C41—C42—C43	−179.0 (2)	C56—C51—P2—C41	76.2 (2)

Experimental details

Crystal data
Chemical formula	C₃₆H₂₇NOP₂
M_r	551.53
Crystal system, space group	Triclinic, P1
Temperature (K)	173
a, b, c (Å)	10.4233 (3), 10.9113 (3), 12.9940 (4)
α, β, γ (°)	104.055 (2), 102.555 (2), 97.459 (2)
V (Å³)	1373.04 (7)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	0.19
Crystal size (mm)	0.40 × 0.18 × 0.12

Data collection
Diffractometer	Bruker SMART CCD area-detector diffractometer
Absorption correction	–
No. of measured, independent and observed [I > 2σ(I)] reflections	15968, 5396, 3646
R_int	0.055
(sin θ/λ)_max (Å⁻¹)	0.617

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.043, 0.106, 0.95
No. of reflections	5396
No. of parameters	365
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρ_max, Δρ_min (e Å⁻³)	0.38, −0.30

Computer programs: APEX2 (Bruker, 2005), SAINT-NT (Bruker, 2005), SHELXTL (Sheldrick, 2008), PLATON (Spek, 2003) and ORTEP-3 (Farrugia, 1997).

Acknowledgements

We thank Dr Manuel Fernandez for the data collection, and SASOL, THRIP and the University of KwaZulu-Natal for financial support.

References

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