organic compounds
(R)-2-Methyl-5-[(R)-2,4,4,4-tetrachlorobutan-2-yl]cyclohex-2-enone
aEquipe de Chimie de Coordination, Faculté des Sciences Semlalia, BP 2390, Marrakech, Morocco, and bInstitute of Physics, University of Neuchâtel, 2000 Neuchâtel, Switzerland
*Correspondence e-mail: lafirdoussi@hotmail.com,helen.stoeckli-evans@unine.ch
The title compound, C11H14Cl4O, was efficiently synthesized by atom-transfer radical addition between (R)-carvone and tetrachloromethane. In the molecule, both chiral centres are of the R. The cyclohex-2-enone ring has an with the chiral C atom displaced by 0.633 (2) Å from the mean plane through the other five C atoms [maximum deviation = 0.036 (2) Å]. In the crystal, molecules are linked via C—H⋯O interactions, leading to the formation of helical chains propagating along [100].
Related literature
For synthetic details, see: Boualy et al. (2011); Dragutan et al. (2007). For related structures, see: Boualy et al. (2009, 2011); Ziyat et al. (2004, 2006). For the distribution of caraway (Carum carvi L.), see: Carvalho da & Fonseca da (2006); Hornok (1992). For biological activity, see: Farag et al. (1989); Juaristi & Soloschonok (2005); Nagashima et al. (2003); Reynolds (1987); Saxena et al. (1987); Zheng et al. (1992). For carvone derivatives having olfactory properties, see: Buch & Wuest (1969); Aurrecoechea & Okamura (1987); Torii et al. (1983).
Experimental
Crystal data
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Data collection: EXPOSE in IPDS-I (Stoe & Cie, 2004); cell CELL in IPDS-I (Stoe & Cie, 2004); data reduction: INTEGRATE in IPDS-I (Stoe & Cie, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009) and Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL97, PLATON and publCIF (Westrip, 2010).
Supporting information
https://doi.org/10.1107/S1600536812031194/kp2431sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536812031194/kp2431Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536812031194/kp2431Isup3.cml
The synthesis of the title compound (Boualy et al., 2011) is illustrated in Fig. 3. A mixture of Fe(acac)3 (4.87 mg, 0.0138 mmol), NEt3 (4.485 mg, 0.044 mmol), (R)-Carvone (207.30 mg, 1.38 mmol) and CCl4 (849.09 mg, 5.52 mmol), was stirred in 353 K in 5 mL of toluene for 6 h and then hydrolyzed by addition of 20 mL of water. The organic layer was separated and the aqueous layer was washed with 3 × 10 mL of dichloromethane. The combined organic extracts were dried over Na2SO4 and concentred in a rotary evaporator at reduced pressure. α]20D = +14.2 (c = 1.01, CHCl3); 1H NMR (300 MHz, CDCl3): δ = 1.70 (S, 3H); 1.85 (S, 3H), 2.24–2.67 (m, 5H), 3.35 (S, éH), 6.50 (m, 1H); 13C NMR (75 MHz, CDCl3): δ = 15.55 (CH3–), 27.37 (CH3–), 27.89 (–CH2–), 39.83 (–CH2–), 45.74 (–CH–), 62.50 (–CH2—CCl3), 73.31 (–C—Cl), 96.15 (–CCl3), 135.68 (=Cq), 142.52 (=CH), 197.26 (C=O); MS (EI, 70 eV): m/z (%) = 304 [M+].
(hexane / ethyl acetate: 5:1 v/v) of the residue on silica gel gave 285.76 mg (0.94 mmol, 68%) of the title compound as a colourless solid. Recrystallization in chloroform at rt afforded colourless rod-like crystals suitable for X-ray crystallographic analysis. M. p. 411 K; [C-bound H-atoms were included in calculated positions and treated as riding atoms: C—H = 0.93, 0.98, 0.97 and 0.96 Å for CH(allyl), CH(methine), CH2, and CH3 H-atoms, respectively, with Uiso(H) = k × Ueq(C), where k = 1.5 for CH3 H-atoms and = 1.2 for other H-atoms.
Caraway (Carum carvi L.) is naturally found in Northern and Central Europe, Siberia, Turkey, Iran, India and North Africa (Carvalho da & Fonseca da, 2006). The main constituent (50–70%) of the essential Caraway oil is (4S)-(+)-carvone (Hornok, 1992). This monoterpene exhibits some interesting biological activities, such as antimicrobial (Farag et al., 1989), nematicidal (Saxena et al., 1987), antitumor (Zheng et al., 1992) and plant growth regulatory activities (Reynolds, 1987). In fact, many syntheses from carvone were reported in order to prepare new compounds having olfactory properties suitable in various fields (Buch & Wuest, 1969; Aurrecoechea & Okamura, 1987; Torii et al., 1983).
The Kharasch addition or atom transfer radical addition (ATRA) is a synthetically useful process for functionalizing organic compounds by means of halogen derivatives (Dragutan et al., 2007). They are applied in the synthesis of polyfunctional acyclic and β-aminoacids (Juaristi & Soloschonok, 2005) and (Nagashima et al., 2003). As a part of our interest in the synthesis of optically actives polyhalogenated products from (Boualy et al., 2009; Ziyat et al., 2004; Ziyat et al., 2006; Boualy et al., 2011) we report herein on the synthesis and of the title compound. It is a new polyhalogenated terpene from (R)-carvone, which could be a valuable precursor for the synthesis of new polyfunctional terpenic compounds.
such asThe title compound (Fig. 1) was obtained as a colourless solid by addition of tetrachloromethane to (R)-carvone catalyzed by Fe(acac)3 in toluene at 353 K (Boualy et al., 2011). The two chiral centres, C1 and C7, have R absolute configurations (Fig. 1). The cyclohex-2-enone ring (C1—C6) has an
with the chiral C atom, C1, displaced by 0.633 (2) Å from the mean plane through the other five C atoms [C2—C6; maximum deviation 0.036 (2) Å]. In the molecule there is a short C2—H2A···Cl1 contact (H2a···Cl1 = 2.72 Å; C2···Cl1 = 3.167 (2) Å).In the crystal, C—H···O interactions (Table 1 and Fig. 2) are present and lead to the formation of helical chains propagating along [100].
The structure of the title molecule was also characterized by 1H, 13C NMR spectroscopy and by ═CH), which indicated also the absence of the olefinic protons of the group (C═CH2). In the 13C NMR spectrum, the signal of the carbonyl group was observed at δ = 199 p.p.m., the olefinic carbons appeared at 144.5 and 135.5 p.p.m. and the quaternary carbon containing three chlorine atoms appeared at 98.4 p.p.m. The conservation of the carbonyl group was also confirmed by the IR absorption at 1720 cm-1. The of the compound confirmed the proposed structure exhibiting a molecular ion peak at m/z 304 and the base peak at m/z 136, which originated from the monoterpene fragment.
1H NMR data of the isolated product indicated the presence of an olefinic proton at 6.77 p.p.m. corresponding to the group (CThe X-ray single-crystal analysis of the title compound clearly shows the
at atoms C1 and C7 to be (R, R)(Fig.1).For synthetic details, see: Boualy et al. (2011); Dragutan et al. (2007). For related structures, see: Boualy et al. (2009, 2011); Ziyat et al. (2004, 2006). For the distribution of caraway (Carum carvi L.), see: Carvalho da & Fonseca da (2006); Hornok (1992). For biological activity, see: Farag et al. (1989); Juaristi & Soloschonok (2005); Nagashima et al. (2003); Reynolds (1987); Saxena et al. (1987); Zheng et al. (1992). For carvone derivatives having olfactory properties, see: Buch & Wuest (1969); Aurrecoechea & Okamura (1987); Torii et al. (1983).
Data collection: EXPOSE in IPDS-I (Stoe & Cie, 2004); cell
CELL in IPDS-I (Stoe & Cie, 2004); data reduction: INTEGRATE in IPDS-I (Stoe & Cie, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009) and Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008), PLATON (Spek, 2009) and publCIF (Westrip, 2010).C11H14Cl4O | F(000) = 624 |
Mr = 304.02 | Dx = 1.478 Mg m−3 |
Orthorhombic, P212121 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P 2ac 2ab | Cell parameters from 6130 reflections |
a = 6.4976 (6) Å | θ = 2.5–21.9° |
b = 13.3343 (16) Å | µ = 0.84 mm−1 |
c = 15.7648 (14) Å | T = 293 K |
V = 1365.9 (2) Å3 | Rod, colourless |
Z = 4 | 0.38 × 0.27 × 0.20 mm |
Stoe IPDS diffractometer | 2431 independent reflections |
Radiation source: fine-focus sealed tube | 1662 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.033 |
φ rotation scans | θmax = 25.1°, θmin = 2.6° |
Absorption correction: multi-scan (MULscanABS in PLATON; Spek, 2009) | h = −7→7 |
Tmin = 0.963, Tmax = 1.000 | k = −15→15 |
9786 measured reflections | l = −18→18 |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.029 | H-atom parameters constrained |
wR(F2) = 0.063 | w = 1/[σ2(Fo2) + (0.0338P)2] where P = (Fo2 + 2Fc2)/3 |
S = 0.87 | (Δ/σ)max < 0.001 |
2431 reflections | Δρmax = 0.21 e Å−3 |
148 parameters | Δρmin = −0.19 e Å−3 |
0 restraints | Absolute structure: Flack (1983), 1005 Friedel pairs |
Primary atom site location: structure-invariant direct methods | Absolute structure parameter: 0.00 (7) |
C11H14Cl4O | V = 1365.9 (2) Å3 |
Mr = 304.02 | Z = 4 |
Orthorhombic, P212121 | Mo Kα radiation |
a = 6.4976 (6) Å | µ = 0.84 mm−1 |
b = 13.3343 (16) Å | T = 293 K |
c = 15.7648 (14) Å | 0.38 × 0.27 × 0.20 mm |
Stoe IPDS diffractometer | 2431 independent reflections |
Absorption correction: multi-scan (MULscanABS in PLATON; Spek, 2009) | 1662 reflections with I > 2σ(I) |
Tmin = 0.963, Tmax = 1.000 | Rint = 0.033 |
9786 measured reflections |
R[F2 > 2σ(F2)] = 0.029 | H-atom parameters constrained |
wR(F2) = 0.063 | Δρmax = 0.21 e Å−3 |
S = 0.87 | Δρmin = −0.19 e Å−3 |
2431 reflections | Absolute structure: Flack (1983), 1005 Friedel pairs |
148 parameters | Absolute structure parameter: 0.00 (7) |
0 restraints |
Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell e.s.d.'s are taken into account in the estimation of distances, angles and torsion angles |
x | y | z | Uiso*/Ueq | ||
Cl1 | 0.83987 (14) | 0.40824 (6) | 0.52522 (6) | 0.0812 (3) | |
Cl2 | 0.52828 (15) | 0.48377 (7) | 0.24964 (5) | 0.0845 (3) | |
Cl3 | 0.23706 (13) | 0.38341 (7) | 0.35431 (5) | 0.0834 (3) | |
Cl4 | 0.65044 (18) | 0.31020 (7) | 0.34378 (6) | 0.1061 (4) | |
O1 | 0.8569 (3) | 0.77674 (13) | 0.61294 (12) | 0.0671 (7) | |
C1 | 0.5690 (4) | 0.55138 (18) | 0.56903 (14) | 0.0423 (8) | |
C2 | 0.7126 (4) | 0.63646 (17) | 0.54387 (15) | 0.0474 (9) | |
C3 | 0.7060 (4) | 0.72331 (18) | 0.60355 (14) | 0.0471 (9) | |
C4 | 0.5098 (4) | 0.74598 (18) | 0.64494 (14) | 0.0502 (9) | |
C5 | 0.3492 (5) | 0.6861 (2) | 0.63074 (14) | 0.0545 (10) | |
C6 | 0.3522 (4) | 0.59286 (19) | 0.57915 (15) | 0.0518 (9) | |
C7 | 0.5809 (4) | 0.45906 (18) | 0.51053 (15) | 0.0474 (9) | |
C8 | 0.5589 (4) | 0.49132 (17) | 0.41742 (13) | 0.0468 (9) | |
C9 | 0.4989 (4) | 0.41885 (19) | 0.34799 (16) | 0.0561 (9) | |
C10 | 0.4985 (6) | 0.8381 (2) | 0.69942 (18) | 0.0788 (14) | |
C11 | 0.4329 (5) | 0.3768 (2) | 0.54069 (17) | 0.0696 (10) | |
H1 | 0.61290 | 0.52900 | 0.62540 | 0.0510* | |
H2A | 0.85230 | 0.61100 | 0.54130 | 0.0570* | |
H2B | 0.67570 | 0.65950 | 0.48750 | 0.0570* | |
H5 | 0.22450 | 0.70430 | 0.65520 | 0.0650* | |
H6A | 0.29500 | 0.60680 | 0.52350 | 0.0620* | |
H6B | 0.26610 | 0.54270 | 0.60610 | 0.0620* | |
H8A | 0.45870 | 0.54520 | 0.41630 | 0.0560* | |
H8B | 0.68970 | 0.52050 | 0.40090 | 0.0560* | |
H10A | 0.52610 | 0.89630 | 0.66540 | 0.1180* | |
H10B | 0.59880 | 0.83350 | 0.74400 | 0.1180* | |
H10C | 0.36350 | 0.84340 | 0.72370 | 0.1180* | |
H11A | 0.45650 | 0.36340 | 0.59970 | 0.1050* | |
H11B | 0.45610 | 0.31680 | 0.50840 | 0.1050* | |
H11C | 0.29350 | 0.39880 | 0.53280 | 0.1050* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.0681 (6) | 0.0751 (5) | 0.1004 (6) | 0.0255 (5) | −0.0196 (5) | −0.0134 (4) |
Cl2 | 0.0987 (7) | 0.1091 (7) | 0.0457 (3) | −0.0243 (5) | 0.0049 (4) | −0.0112 (4) |
Cl3 | 0.0705 (6) | 0.1037 (6) | 0.0760 (5) | −0.0304 (4) | −0.0028 (5) | −0.0140 (5) |
Cl4 | 0.1214 (8) | 0.0882 (6) | 0.1088 (7) | 0.0334 (6) | −0.0023 (6) | −0.0402 (6) |
O1 | 0.0625 (14) | 0.0576 (11) | 0.0812 (12) | −0.0165 (11) | −0.0107 (11) | −0.0027 (9) |
C1 | 0.0386 (17) | 0.0511 (14) | 0.0371 (12) | −0.0032 (12) | −0.0011 (10) | 0.0052 (10) |
C2 | 0.0364 (16) | 0.0561 (15) | 0.0498 (14) | −0.0051 (12) | 0.0052 (12) | −0.0003 (12) |
C3 | 0.0510 (19) | 0.0434 (14) | 0.0469 (13) | −0.0009 (13) | −0.0095 (13) | 0.0082 (11) |
C4 | 0.0541 (18) | 0.0535 (15) | 0.0429 (12) | 0.0091 (14) | −0.0050 (14) | 0.0011 (12) |
C5 | 0.0459 (18) | 0.0702 (17) | 0.0473 (15) | 0.0167 (15) | 0.0057 (13) | 0.0083 (13) |
C6 | 0.0377 (16) | 0.0712 (17) | 0.0464 (14) | −0.0053 (15) | 0.0029 (12) | 0.0042 (12) |
C7 | 0.0454 (18) | 0.0475 (14) | 0.0493 (13) | 0.0012 (12) | −0.0038 (11) | 0.0022 (11) |
C8 | 0.0461 (17) | 0.0507 (15) | 0.0436 (12) | −0.0038 (13) | 0.0023 (12) | −0.0030 (11) |
C9 | 0.0516 (18) | 0.0648 (16) | 0.0519 (14) | −0.0021 (14) | 0.0015 (14) | −0.0167 (13) |
C10 | 0.093 (3) | 0.066 (2) | 0.0774 (19) | 0.0220 (19) | −0.0065 (19) | −0.0139 (16) |
C11 | 0.089 (2) | 0.0573 (16) | 0.0624 (16) | −0.0234 (16) | −0.0038 (17) | 0.0118 (14) |
Cl1—C7 | 1.829 (3) | C8—C9 | 1.511 (3) |
Cl2—C9 | 1.786 (3) | C1—H1 | 0.9800 |
Cl3—C9 | 1.769 (3) | C2—H2A | 0.9700 |
Cl4—C9 | 1.753 (3) | C2—H2B | 0.9700 |
O1—C3 | 1.221 (3) | C5—H5 | 0.9300 |
C1—C2 | 1.522 (3) | C6—H6A | 0.9700 |
C1—C6 | 1.522 (4) | C6—H6B | 0.9700 |
C1—C7 | 1.540 (3) | C8—H8A | 0.9700 |
C2—C3 | 1.493 (3) | C8—H8B | 0.9700 |
C3—C4 | 1.464 (4) | C10—H10A | 0.9600 |
C4—C5 | 1.333 (4) | C10—H10B | 0.9600 |
C4—C10 | 1.501 (4) | C10—H10C | 0.9600 |
C5—C6 | 1.486 (4) | C11—H11A | 0.9600 |
C7—C8 | 1.536 (3) | C11—H11B | 0.9600 |
C7—C11 | 1.534 (4) | C11—H11C | 0.9600 |
C2—C1—C6 | 108.9 (2) | C1—C2—H2B | 109.00 |
C2—C1—C7 | 114.2 (2) | C3—C2—H2A | 109.00 |
C6—C1—C7 | 113.6 (2) | C3—C2—H2B | 109.00 |
C1—C2—C3 | 113.4 (2) | H2A—C2—H2B | 108.00 |
O1—C3—C2 | 120.4 (2) | C4—C5—H5 | 117.00 |
O1—C3—C4 | 121.7 (2) | C6—C5—H5 | 117.00 |
C2—C3—C4 | 117.8 (2) | C1—C6—H6A | 109.00 |
C3—C4—C5 | 118.9 (2) | C1—C6—H6B | 109.00 |
C3—C4—C10 | 117.8 (2) | C5—C6—H6A | 109.00 |
C5—C4—C10 | 123.2 (3) | C5—C6—H6B | 109.00 |
C4—C5—C6 | 125.7 (3) | H6A—C6—H6B | 108.00 |
C1—C6—C5 | 111.9 (2) | C7—C8—H8A | 107.00 |
Cl1—C7—C1 | 105.46 (17) | C7—C8—H8B | 107.00 |
Cl1—C7—C8 | 108.08 (17) | C9—C8—H8A | 107.00 |
Cl1—C7—C11 | 105.82 (18) | C9—C8—H8B | 107.00 |
C1—C7—C8 | 110.10 (19) | H8A—C8—H8B | 107.00 |
C1—C7—C11 | 110.8 (2) | C4—C10—H10A | 109.00 |
C8—C7—C11 | 116.0 (2) | C4—C10—H10B | 109.00 |
C7—C8—C9 | 122.5 (2) | C4—C10—H10C | 109.00 |
Cl2—C9—Cl3 | 106.34 (14) | H10A—C10—H10B | 109.00 |
Cl2—C9—Cl4 | 107.92 (14) | H10A—C10—H10C | 110.00 |
Cl2—C9—C8 | 106.93 (17) | H10B—C10—H10C | 109.00 |
Cl3—C9—Cl4 | 108.76 (14) | C7—C11—H11A | 109.00 |
Cl3—C9—C8 | 112.22 (18) | C7—C11—H11B | 109.00 |
Cl4—C9—C8 | 114.27 (18) | C7—C11—H11C | 109.00 |
C2—C1—H1 | 107.00 | H11A—C11—H11B | 109.00 |
C6—C1—H1 | 107.00 | H11A—C11—H11C | 109.00 |
C7—C1—H1 | 107.00 | H11B—C11—H11C | 110.00 |
C1—C2—H2A | 109.00 | ||
C6—C1—C2—C3 | 54.6 (3) | O1—C3—C4—C10 | 0.4 (3) |
C7—C1—C2—C3 | −177.3 (2) | C2—C3—C4—C5 | 3.0 (3) |
C2—C1—C6—C5 | −47.4 (3) | C2—C3—C4—C10 | −175.2 (2) |
C7—C1—C6—C5 | −175.77 (19) | C3—C4—C5—C6 | 3.5 (4) |
C2—C1—C7—Cl1 | 65.6 (2) | C10—C4—C5—C6 | −178.5 (2) |
C2—C1—C7—C8 | −50.8 (3) | C4—C5—C6—C1 | 20.2 (3) |
C2—C1—C7—C11 | 179.6 (2) | Cl1—C7—C8—C9 | 84.7 (3) |
C6—C1—C7—Cl1 | −168.79 (16) | C1—C7—C8—C9 | −160.6 (2) |
C6—C1—C7—C8 | 74.8 (3) | C11—C7—C8—C9 | −33.9 (3) |
C6—C1—C7—C11 | −54.8 (3) | C7—C8—C9—Cl2 | −171.8 (2) |
C1—C2—C3—O1 | 151.4 (2) | C7—C8—C9—Cl3 | 71.9 (3) |
C1—C2—C3—C4 | −33.0 (3) | C7—C8—C9—Cl4 | −52.5 (3) |
O1—C3—C4—C5 | 178.5 (2) |
D—H···A | D—H | H···A | D···A | D—H···A |
C8—H8A···O1i | 0.97 | 2.51 | 3.394 (3) | 152 |
Symmetry code: (i) x−1/2, −y+3/2, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C11H14Cl4O |
Mr | 304.02 |
Crystal system, space group | Orthorhombic, P212121 |
Temperature (K) | 293 |
a, b, c (Å) | 6.4976 (6), 13.3343 (16), 15.7648 (14) |
V (Å3) | 1365.9 (2) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.84 |
Crystal size (mm) | 0.38 × 0.27 × 0.20 |
Data collection | |
Diffractometer | Stoe IPDS |
Absorption correction | Multi-scan (MULscanABS in PLATON; Spek, 2009) |
Tmin, Tmax | 0.963, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 9786, 2431, 1662 |
Rint | 0.033 |
(sin θ/λ)max (Å−1) | 0.597 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.029, 0.063, 0.87 |
No. of reflections | 2431 |
No. of parameters | 148 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.21, −0.19 |
Absolute structure | Flack (1983), 1005 Friedel pairs |
Absolute structure parameter | 0.00 (7) |
Computer programs: EXPOSE in IPDS-I (Stoe & Cie, 2004), CELL in IPDS-I (Stoe & Cie, 2004), INTEGRATE in IPDS-I (Stoe & Cie, 2004), SHELXS97 (Sheldrick, 2008), PLATON (Spek, 2009) and Mercury (Macrae et al., 2008), SHELXL97 (Sheldrick, 2008), PLATON (Spek, 2009) and publCIF (Westrip, 2010).
D—H···A | D—H | H···A | D···A | D—H···A |
C8—H8A···O1i | 0.97 | 2.51 | 3.394 (3) | 152 |
Symmetry code: (i) x−1/2, −y+3/2, −z+1. |
Acknowledgements
HSE thanks the XRD Application Laboratory of the CSEM, Neuchâtel, for access to the X-ray diffraction equipment.
References
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Caraway (Carum carvi L.) is naturally found in Northern and Central Europe, Siberia, Turkey, Iran, India and North Africa (Carvalho da & Fonseca da, 2006). The main constituent (50–70%) of the essential Caraway oil is (4S)-(+)-carvone (Hornok, 1992). This monoterpene exhibits some interesting biological activities, such as antimicrobial (Farag et al., 1989), nematicidal (Saxena et al., 1987), antitumor (Zheng et al., 1992) and plant growth regulatory activities (Reynolds, 1987). In fact, many syntheses from carvone were reported in order to prepare new compounds having olfactory properties suitable in various fields (Buch & Wuest, 1969; Aurrecoechea & Okamura, 1987; Torii et al., 1983).
The Kharasch addition or atom transfer radical addition (ATRA) is a synthetically useful process for functionalizing organic compounds by means of halogen derivatives (Dragutan et al., 2007). They are applied in the synthesis of polyfunctional acyclic and heterocyclic compounds, such as β-aminoacids (Juaristi & Soloschonok, 2005) and alkaloids (Nagashima et al., 2003). As a part of our interest in the synthesis of optically actives polyhalogenated products from terpenes (Boualy et al., 2009; Ziyat et al., 2004; Ziyat et al., 2006; Boualy et al., 2011) we report herein on the synthesis and crystal structure of the title compound. It is a new polyhalogenated terpene from (R)-carvone, which could be a valuable precursor for the synthesis of new polyfunctional terpenic compounds.
The title compound (Fig. 1) was obtained as a colourless solid by addition of tetrachloromethane to (R)-carvone catalyzed by Fe(acac)3 in toluene at 353 K (Boualy et al., 2011). The two chiral centres, C1 and C7, have R absolute configurations (Fig. 1). The cyclohex-2-enone ring (C1—C6) has an envelope conformation with the chiral C atom, C1, displaced by 0.633 (2) Å from the mean plane through the other five C atoms [C2—C6; maximum deviation 0.036 (2) Å]. In the molecule there is a short C2—H2A···Cl1 contact (H2a···Cl1 = 2.72 Å; C2···Cl1 = 3.167 (2) Å).
In the crystal, C—H···O interactions (Table 1 and Fig. 2) are present and lead to the formation of helical chains propagating along [100].
The structure of the title molecule was also characterized by 1H, 13C NMR spectroscopy and by mass spectroscopy. 1H NMR data of the isolated product indicated the presence of an olefinic proton at 6.77 p.p.m. corresponding to the group (C═CH), which indicated also the absence of the olefinic protons of the group (C═CH2). In the 13C NMR spectrum, the signal of the carbonyl group was observed at δ = 199 p.p.m., the olefinic carbons appeared at 144.5 and 135.5 p.p.m. and the quaternary carbon containing three chlorine atoms appeared at 98.4 p.p.m. The conservation of the carbonyl group was also confirmed by the IR absorption at 1720 cm-1. The mass spectrum of the compound confirmed the proposed structure exhibiting a molecular ion peak at m/z 304 and the base peak at m/z 136, which originated from the monoterpene fragment.
The X-ray single-crystal analysis of the title compound clearly shows the absolute configuration at atoms C1 and C7 to be (R, R)(Fig.1).