In the title compound, C9H15Br2NO, the piperidin-4-one ring adopts a chair conformation.
Supporting information
CCDC reference: 636669
Key indicators
- Single-crystal X-ray study
- T = 293 K
- Mean (C-C) = 0.006 Å
- R factor = 0.043
- wR factor = 0.090
- Data-to-parameter ratio = 17.4
checkCIF/PLATON results
No syntax errors found
Datablock: I
Alert level C
PLAT420_ALERT_2_C D-H Without Acceptor N1 - H1A ... ?
PLAT480_ALERT_4_C Long H...A H-Bond Reported H1A .. O1 .. 2.64 Ang.
Alert level G
PLAT199_ALERT_1_G Check the Reported _cell_measurement_temperature 293 K
PLAT200_ALERT_1_G Check the Reported _diffrn_ambient_temperature . 293 K
0 ALERT level A = In general: serious problem
0 ALERT level B = Potentially serious problem
2 ALERT level C = Check and explain
2 ALERT level G = General alerts; check
2 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
1 ALERT type 2 Indicator that the structure model may be wrong or deficient
0 ALERT type 3 Indicator that the structure quality may be low
1 ALERT type 4 Improvement, methodology, query or suggestion
0 ALERT type 5 Informative message, check
Data collection: CrystalClear (Rigaku/MSC, 2005); cell refinement: CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Bruker, 1997); software used to prepare material for publication: SHELXTL.
3,5-dibromo-2,2,6,6-tetramethylpiperidin-4-one
top
Crystal data top
C9H15Br2NO | F(000) = 616 |
Mr = 313.04 | Dx = 1.866 Mg m−3 |
Monoclinic, P21/c | Melting point: 418 K |
Hall symbol: -P 2ybc | Mo Kα radiation, λ = 0.71073 Å |
a = 8.8677 (18) Å | Cell parameters from 2481 reflections |
b = 21.968 (4) Å | θ = 1.9–27.9° |
c = 6.0078 (12) Å | µ = 7.24 mm−1 |
β = 107.78 (3)° | T = 293 K |
V = 1114.5 (4) Å3 | Prism, colorless |
Z = 4 | 0.34 × 0.18 × 0.16 mm |
Data collection top
Rigaku Saturn diffractometer | 2181 independent reflections |
Radiation source: fine-focus sealed tube | 1667 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.079 |
Detector resolution: 7.31 pixels mm-1 | θmax = 26.0°, θmin = 1.9° |
ω scans | h = −10→10 |
Absorption correction: multi-scan (Jacobson, 1998) | k = −27→26 |
Tmin = 0.210, Tmax = 0.314 | l = −7→7 |
8984 measured reflections | |
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: difmap and geom |
wR(F2) = 0.090 | H atoms treated by a mixture of independent and constrained refinement |
S = 0.99 | w = 1/[σ2(Fo2) + (0.0326P)2] where P = (Fo2 + 2Fc2)/3 |
2181 reflections | (Δ/σ)max = 0.001 |
125 parameters | Δρmax = 0.84 e Å−3 |
0 restraints | Δρmin = −0.86 e Å−3 |
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 | Uiso*/Ueq | |
Br1 | 0.28910 (6) | 0.69608 (2) | 0.51709 (7) | 0.02095 (17) | |
Br2 | 0.96036 (6) | 0.69423 (2) | 0.78746 (8) | 0.02360 (17) | |
C1 | 0.4766 (5) | 0.60658 (19) | 0.8549 (7) | 0.0154 (10) | |
C2 | 0.4816 (5) | 0.67247 (19) | 0.7597 (7) | 0.0145 (10) | |
H2 | 0.4940 | 0.7004 | 0.8912 | 0.017* | |
C3 | 0.6244 (5) | 0.68036 (19) | 0.6778 (7) | 0.0153 (10) | |
C4 | 0.7770 (5) | 0.6713 (2) | 0.8802 (7) | 0.0187 (10) | |
H4 | 0.7725 | 0.6986 | 1.0069 | 0.022* | |
C5 | 0.7819 (5) | 0.6045 (2) | 0.9732 (7) | 0.0172 (10) | |
C6 | 0.3557 (5) | 0.6041 (2) | 0.9900 (7) | 0.0258 (12) | |
H6A | 0.3551 | 0.5640 | 1.0534 | 0.039* | |
H6B | 0.2524 | 0.6134 | 0.8865 | 0.039* | |
H6C | 0.3840 | 0.6332 | 1.1150 | 0.039* | |
C7 | 0.4316 (6) | 0.55958 (19) | 0.6588 (8) | 0.0223 (11) | |
H7A | 0.4936 | 0.5661 | 0.5550 | 0.033* | |
H7B | 0.3212 | 0.5636 | 0.5737 | 0.033* | |
H7C | 0.4516 | 0.5194 | 0.7243 | 0.033* | |
C8 | 0.8095 (6) | 0.5589 (2) | 0.8001 (8) | 0.0250 (11) | |
H8A | 0.7891 | 0.5185 | 0.8450 | 0.037* | |
H8B | 0.9173 | 0.5616 | 0.7989 | 0.037* | |
H8C | 0.7396 | 0.5677 | 0.6467 | 0.037* | |
C9 | 0.9144 (5) | 0.5988 (2) | 1.2049 (7) | 0.0294 (12) | |
H9A | 0.8992 | 0.6286 | 1.3131 | 0.044* | |
H9B | 1.0147 | 0.6055 | 1.1791 | 0.044* | |
H9C | 0.9124 | 0.5588 | 1.2680 | 0.044* | |
N1 | 0.6323 (5) | 0.59331 (17) | 1.0261 (6) | 0.0188 (9) | |
H1A | 0.633 (5) | 0.613 (2) | 1.150 (7) | 0.028* | |
O1 | 0.6210 (4) | 0.69118 (14) | 0.4778 (5) | 0.0240 (8) | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
Br1 | 0.0139 (3) | 0.0215 (3) | 0.0246 (3) | 0.0026 (2) | 0.0016 (2) | 0.00371 (19) |
Br2 | 0.0144 (3) | 0.0210 (3) | 0.0355 (3) | −0.0024 (2) | 0.0078 (2) | −0.0004 (2) |
C1 | 0.013 (3) | 0.015 (2) | 0.015 (2) | −0.001 (2) | 0.0012 (19) | 0.0024 (19) |
C2 | 0.011 (2) | 0.012 (2) | 0.017 (2) | 0.0008 (19) | −0.0010 (18) | −0.0026 (18) |
C3 | 0.014 (3) | 0.007 (2) | 0.024 (3) | −0.0012 (19) | 0.003 (2) | −0.0002 (18) |
C4 | 0.013 (3) | 0.028 (3) | 0.017 (2) | 0.003 (2) | 0.0065 (19) | −0.001 (2) |
C5 | 0.014 (3) | 0.018 (3) | 0.017 (2) | 0.001 (2) | 0.0013 (19) | 0.0028 (19) |
C6 | 0.022 (3) | 0.030 (3) | 0.024 (3) | 0.004 (2) | 0.004 (2) | 0.003 (2) |
C7 | 0.019 (3) | 0.012 (2) | 0.031 (3) | 0.000 (2) | 0.001 (2) | 0.000 (2) |
C8 | 0.024 (3) | 0.019 (3) | 0.033 (3) | 0.000 (2) | 0.009 (2) | 0.001 (2) |
C9 | 0.016 (3) | 0.039 (3) | 0.030 (3) | 0.001 (2) | 0.004 (2) | 0.001 (2) |
N1 | 0.017 (2) | 0.023 (2) | 0.0151 (19) | 0.0012 (19) | 0.0032 (17) | 0.0015 (17) |
O1 | 0.017 (2) | 0.030 (2) | 0.0248 (19) | 0.0018 (15) | 0.0050 (15) | 0.0089 (14) |
Geometric parameters (Å, º) top
C2—Br1 | 1.946 (4) | C5—C9 | 1.528 (6) |
C4—Br2 | 1.940 (5) | C6—H6A | 0.9600 |
C1—N1 | 1.478 (5) | C6—H6B | 0.9600 |
C1—C7 | 1.525 (6) | C6—H6C | 0.9600 |
C1—C6 | 1.530 (6) | C7—H7A | 0.9600 |
C1—C2 | 1.562 (6) | C7—H7B | 0.9600 |
C2—C3 | 1.502 (6) | C7—H7C | 0.9600 |
C2—H2 | 0.9800 | C8—H8A | 0.9600 |
C3—O1 | 1.216 (5) | C8—H8B | 0.9600 |
C3—C4 | 1.532 (6) | C8—H8C | 0.9600 |
C4—C5 | 1.566 (6) | C9—H9A | 0.9600 |
C4—H4 | 0.9800 | C9—H9B | 0.9600 |
C5—N1 | 1.475 (5) | C9—H9C | 0.9600 |
C5—C8 | 1.517 (6) | N1—H1A | 0.86 (4) |
| | | |
N1—C1—C7 | 111.9 (4) | C1—C6—H6A | 109.5 |
N1—C1—C6 | 106.3 (3) | C1—C6—H6B | 109.5 |
C7—C1—C6 | 109.0 (4) | H6A—C6—H6B | 109.5 |
N1—C1—C2 | 108.2 (3) | C1—C6—H6C | 109.5 |
C7—C1—C2 | 112.0 (3) | H6A—C6—H6C | 109.5 |
C6—C1—C2 | 109.3 (4) | H6B—C6—H6C | 109.5 |
C3—C2—C1 | 110.4 (4) | C1—C7—H7A | 109.5 |
C3—C2—Br1 | 111.0 (3) | C1—C7—H7B | 109.5 |
C1—C2—Br1 | 113.9 (3) | H7A—C7—H7B | 109.5 |
C3—C2—H2 | 107.1 | C1—C7—H7C | 109.5 |
C1—C2—H2 | 107.1 | H7A—C7—H7C | 109.5 |
Br1—C2—H2 | 107.1 | H7B—C7—H7C | 109.5 |
O1—C3—C2 | 125.3 (4) | C5—C8—H8A | 109.5 |
O1—C3—C4 | 124.0 (4) | C5—C8—H8B | 109.5 |
C2—C3—C4 | 110.7 (3) | H8A—C8—H8B | 109.5 |
C3—C4—C5 | 109.1 (4) | C5—C8—H8C | 109.5 |
C3—C4—Br2 | 110.7 (3) | H8A—C8—H8C | 109.5 |
C5—C4—Br2 | 114.3 (3) | H8B—C8—H8C | 109.5 |
C3—C4—H4 | 107.5 | C5—C9—H9A | 109.5 |
C5—C4—H4 | 107.5 | C5—C9—H9B | 109.5 |
Br2—C4—H4 | 107.5 | H9A—C9—H9B | 109.5 |
N1—C5—C8 | 112.4 (4) | C5—C9—H9C | 109.5 |
N1—C5—C9 | 106.4 (3) | H9A—C9—H9C | 109.5 |
C8—C5—C9 | 109.3 (4) | H9B—C9—H9C | 109.5 |
N1—C5—C4 | 107.7 (4) | C5—N1—C1 | 121.9 (3) |
C8—C5—C4 | 111.5 (3) | C5—N1—H1A | 110 (3) |
C9—C5—C4 | 109.3 (4) | C1—N1—H1A | 105 (3) |
| | | |
N1—C1—C2—C3 | 51.0 (4) | C2—C3—C4—Br2 | −170.8 (3) |
C7—C1—C2—C3 | −72.8 (4) | C3—C4—C5—N1 | −53.0 (4) |
C6—C1—C2—C3 | 166.4 (3) | Br2—C4—C5—N1 | −177.5 (3) |
N1—C1—C2—Br1 | 176.6 (3) | C3—C4—C5—C8 | 70.8 (5) |
C7—C1—C2—Br1 | 52.8 (4) | Br2—C4—C5—C8 | −53.7 (4) |
C6—C1—C2—Br1 | −68.0 (4) | C3—C4—C5—C9 | −168.2 (4) |
C1—C2—C3—O1 | 117.0 (4) | Br2—C4—C5—C9 | 67.3 (4) |
Br1—C2—C3—O1 | −10.3 (5) | C8—C5—N1—C1 | −72.5 (5) |
C1—C2—C3—C4 | −61.5 (4) | C9—C5—N1—C1 | 167.9 (4) |
Br1—C2—C3—C4 | 171.2 (3) | C4—C5—N1—C1 | 50.8 (5) |
O1—C3—C4—C5 | −115.9 (5) | C7—C1—N1—C5 | 74.5 (5) |
C2—C3—C4—C5 | 62.6 (4) | C6—C1—N1—C5 | −166.6 (4) |
O1—C3—C4—Br2 | 10.7 (5) | C2—C1—N1—C5 | −49.3 (5) |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1a···O1i | 0.86 (4) | 2.64 (4) | 3.488 (6) | 169 (6) |
Symmetry code: (i) x, y, z+1. |