2-Acetyl­hydrazono-2-phenyl­aceto­hydrazide

The title compound, C₁₀H₁₂N₄O₂, was prepared as an inter­mediate for the synthesis of metamitron. The benzene ring plane forms dihedral angles of 66.0 (1) and 3.5 (5)° with the hydrazine plane and the acetyl­imino plane, respectively. The crystal structure involves inter­molecular N—H...O hydrogen bonds.

Key indicators

• Single-crystal X-ray study
• T = 153 K
• Mean [sigma](C-C) = 0.002 Å
• R factor = 0.036
• wR factor = 0.104
• Data-to-parameter ratio = 12.1

checkCIF/PLATON results

No syntax errors found



Alert level C
ABSTM02_ALERT_3_C  The ratio of expected to reported Tmax/Tmin(RR') is < 0.90
            Tmin and Tmax reported:      0.804     0.979
            Tmin(prime) and Tmax expected:      0.959     0.979
            RR(prime) =      0.839
            Please check that your absorption correction is appropriate.
PLAT029_ALERT_3_C _diffrn_measured_fraction_theta_full Low .......       0.98
PLAT061_ALERT_4_C Tmax/Tmin Range Test RR' too Large .............       0.84

   0 ALERT level A = In general: serious problem
   0 ALERT level B = Potentially serious problem
   3 ALERT level C = Check and explain
   0 ALERT level G = General alerts; check

   0 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
   0 ALERT type 2 Indicator that the structure model may be wrong or deficient
   2 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

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S1. Comment

Metamitron (Trade name: Goltix) is used against grass and broad-leaved weeds in sugar and fodder beets. Metamitron is applied pre-drilling and pre- and post-emergence (post-emergence as sequential treatment tank-mixed with oil or other herbicides). Metamitron is also used in mangold, red beet and certain strawberry varieties. The dose rates for metamitron are 0.35–4.2 kg active ingredient/ha for all crops.The currently used weed control strategy in sugarbeet involves a mixture of herbicides (phenmedipham, ethofumesate, metamitron, chloridazon etc) to control dicotyledonus weeds. Wettable powder (70%) has been used for the control of morel goosefoot chickweed Lamium barbatum etc. Metamitron can be used before and after planting. It can be applied to the control of the entire crop growing period with better efficacy when it cooperates with others herbicides and pesticides (Javier et al., 2006).

The title compound (I) was synthesized as an intermediate for the synthesis of metamitron. We report here the crystal structure of (I).

In (I) (Fig. 1), all bond lengths and angles are normal and in a good agreement with those reported previously (Glaser et al., 1993). The benzene ring plane forms dihedral angles of 66.0 (1)° and 3.5 (5)° with the hydrazine plane consisting of O1, N3, N4, and C8, and the acetylimino plane consisting of O2, N1, N2, C9, and C10, respectively. The crystal structure is stabilized by intermolecular N–H–O hydrogen bonds.

Related literature

For related literature on the biological activity, see: Javier et al. (2006). For a similar structure, see: Glaser et al. (1993). For the preparation, see: Pan et al. (2007).

S2. Experimental

Phenylglyoxylic acid ethyl ester 2-acetylhydrazone 23.4 g (0.1 mol), was dissolved in 100 ml ethanol in a flask equipped with stirrer and reflux condenser. Hydrazine hydrate 7.5 g (0.1 mmol) was slowly added from a dropping-funnel during 30 minutes while maintaining the temperature at 25–30°C for two hours. Portions of the solvent were distilled and the remaining solution cooled in ice water. White crystals separated out after a short time (18.9 g, yield 87.3%) (Pan et al., 2007). Single crystals suitable for X-ray measurement were obtained by recrystallization from petrol ether at room temperature.

S3. Refinement

All H atoms were found on difference maps. The hydrazine H atoms were refined freely, giving an N—H bond distance of 0.89 or 0.90 Å. The remaining H atoms were positioned geometrically [N—H = 0.88 Å C—H = 0.95 Å (CH), C—H = 0.98 Å (CH3), andU_iso (H) = 1.5 times (Methyl) or U_iso(H) = 1.2 times (other H atoms)].

Computing details

Data collection: RAPID-AUTO (Rigaku, 2004); cell refinement: RAPID-AUTO (Rigaku, 2004); data reduction: RAPID-AUTO (Rigaku, 2004); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures

	Fig. 1. View of the title compound (I), with displacement ellipsoids drawn at the 35% probability level.
	Fig. 2. A packing diagram of the molecule of the title compound, view down b axis. Hydrogen bonds are shown as dashed lines.

2-Acetylhydrazono-2-phenylacetohydrazide

Crystal data

C10H12N4O2	F(000) = 464
Mr = 220.24	Dx = 1.346 Mg m^−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 2652 reflections
a = 12.737 (3) Å	θ = 2.6–25.6°
b = 4.5867 (10) Å	µ = 0.10 mm^−1
c = 21.002 (7) Å	T = 153 K
β = 117.62 (2)°	Block, colorless
V = 1087.1 (5) Å^3	0.42 × 0.31 × 0.22 mm
Z = 4

Data collection

Rigaku R-AXIS RAPID IP area-detector diffractometer	1878 independent reflections
Radiation source: Rotating Anode	1624 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.024
ω Oscillation scans	θmax = 25.0°, θmin = 3.2°
Absorption correction: multi-scan (ABSCOR; Higashi 1995)	h = −15→15
Tmin = 0.805, Tmax = 0.979	k = −5→5
7793 measured reflections	l = −24→24

Refinement

Refinement on F^2	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F^2 > 2σ(F^2)] = 0.035	H atoms treated by a mixture of independent and constrained refinement
wR(F^2) = 0.103	w = 1/[σ^2(Fo^2) + (0.0567P)^2 + 0.2207P] where P = (Fo^2 + 2Fc^2)/3
S = 1.08	(Δ/σ)max = 0.001
1878 reflections	Δρmax = 0.20 e Å^−3
155 parameters	Δρmin = −0.16 e Å^−3
0 restraints	Extinction correction: SHELXTL (Sheldrick, 2008), Fc^*=kFc[1+0.001xFc^2λ^3/sin(2θ)]^-1/4
Primary atom site location: structure-invariant direct methods	Extinction coefficient: 0.024 (4)

Special details

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 (Ų)

	x	y	z	Uiso*/Ueq
O1	0.40065 (9)	1.19619 (19)	0.29348 (5)	0.0427 (3)
O2	0.44401 (10)	0.7702 (2)	0.54459 (5)	0.0531 (3)
N1	0.27633 (9)	0.7290 (2)	0.35864 (6)	0.0362 (3)
N2	0.36620 (10)	0.8004 (3)	0.42552 (6)	0.0390 (3)
H2B	0.4245	0.9138	0.4292	0.047*
N3	0.49466 (9)	0.7681 (2)	0.33409 (6)	0.0359 (3)
H3B	0.4858	0.5829	0.3415	0.043*
N4	0.60867 (10)	0.8674 (3)	0.34944 (7)	0.0423 (3)
C1	0.19350 (13)	0.8340 (4)	0.17011 (7)	0.0469 (4)
H1A	0.2573	0.9530	0.1742	0.056*
C2	0.10157 (15)	0.7697 (4)	0.10282 (8)	0.0573 (4)
H2A	0.1027	0.8455	0.0610	0.069*
C3	0.00929 (13)	0.5978 (4)	0.09616 (8)	0.0585 (5)
H3A	−0.0536	0.5542	0.0499	0.070*
C4	0.00809 (14)	0.4882 (4)	0.15689 (9)	0.0634 (5)
H4A	−0.0560	0.3691	0.1524	0.076*
C5	0.09888 (13)	0.5496 (4)	0.22391 (8)	0.0517 (4)
H5A	0.0975	0.4711	0.2654	0.062*
C6	0.19282 (11)	0.7257 (3)	0.23147 (7)	0.0348 (3)
C7	0.28992 (11)	0.7937 (3)	0.30347 (6)	0.0321 (3)
C8	0.40034 (10)	0.9387 (3)	0.30915 (6)	0.0301 (3)
C9	0.36513 (12)	0.6973 (3)	0.48520 (7)	0.0378 (3)
C10	0.26833 (13)	0.4954 (4)	0.47702 (8)	0.0514 (4)
H10A	0.2836	0.4216	0.5243	0.077*
H10B	0.2650	0.3317	0.4462	0.077*
H10C	0.1926	0.5998	0.4552	0.077*
H4C	0.6083 (14)	0.900 (4)	0.3076 (10)	0.055 (5)*
H4B	0.6174 (15)	1.039 (4)	0.3717 (9)	0.061 (5)*

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
O1	0.0494 (6)	0.0282 (5)	0.0425 (5)	−0.0037 (4)	0.0144 (4)	0.0028 (4)
O2	0.0597 (7)	0.0632 (7)	0.0316 (5)	−0.0165 (5)	0.0171 (5)	−0.0079 (5)
N1	0.0332 (6)	0.0421 (7)	0.0320 (6)	−0.0033 (4)	0.0138 (5)	−0.0042 (5)
N2	0.0379 (6)	0.0480 (7)	0.0313 (6)	−0.0107 (5)	0.0162 (5)	−0.0060 (5)
N3	0.0363 (6)	0.0275 (5)	0.0472 (6)	−0.0034 (4)	0.0220 (5)	0.0000 (5)
N4	0.0367 (6)	0.0480 (8)	0.0463 (7)	−0.0055 (5)	0.0227 (5)	−0.0012 (6)
C1	0.0449 (8)	0.0560 (9)	0.0371 (7)	−0.0082 (7)	0.0166 (6)	−0.0022 (7)
C2	0.0578 (10)	0.0741 (12)	0.0323 (7)	−0.0047 (8)	0.0144 (7)	−0.0015 (7)
C3	0.0421 (9)	0.0794 (12)	0.0399 (8)	−0.0050 (8)	0.0070 (6)	−0.0153 (8)
C4	0.0437 (9)	0.0879 (13)	0.0532 (9)	−0.0243 (8)	0.0180 (7)	−0.0173 (9)
C5	0.0452 (8)	0.0679 (11)	0.0417 (7)	−0.0158 (7)	0.0200 (6)	−0.0075 (7)
C6	0.0316 (7)	0.0370 (7)	0.0339 (7)	0.0014 (5)	0.0136 (5)	−0.0044 (5)
C7	0.0343 (7)	0.0295 (7)	0.0323 (6)	0.0009 (5)	0.0155 (5)	−0.0023 (5)
C8	0.0364 (7)	0.0274 (7)	0.0249 (6)	−0.0032 (5)	0.0128 (5)	−0.0041 (5)
C9	0.0406 (7)	0.0401 (8)	0.0331 (7)	0.0008 (6)	0.0176 (6)	−0.0023 (6)
C10	0.0490 (9)	0.0602 (10)	0.0434 (8)	−0.0078 (7)	0.0200 (7)	0.0072 (7)

Geometric parameters (Å, º)

O1—C8	1.2263 (15)	C2—C3	1.368 (2)
O2—C9	1.2308 (17)	C2—H2A	0.9500
N1—C7	1.2833 (17)	C3—C4	1.378 (2)
N1—N2	1.3783 (16)	C3—H3A	0.9500
N2—C9	1.3455 (18)	C4—C5	1.374 (2)
N2—H2B	0.8800	C4—H4A	0.9500
N3—C8	1.3218 (16)	C5—C6	1.391 (2)
N3—N4	1.4093 (15)	C5—H5A	0.9500
N3—H3B	0.8800	C6—C7	1.4762 (18)
N4—H4C	0.890 (18)	C7—C8	1.5097 (17)
N4—H4B	0.90 (2)	C9—C10	1.487 (2)
C1—C6	1.385 (2)	C10—H10A	0.9800
C1—C2	1.386 (2)	C10—H10B	0.9800
C1—H1A	0.9500	C10—H10C	0.9800
C7—N1—N2	117.99 (11)	C4—C5—C6	120.46 (15)
C9—N2—N1	120.24 (11)	C4—C5—H5A	119.8
C9—N2—H2B	119.9	C6—C5—H5A	119.8
N1—N2—H2B	119.9	C1—C6—C5	118.57 (12)
C8—N3—N4	123.36 (11)	C1—C6—C7	120.92 (12)
C8—N3—H3B	118.3	C5—C6—C7	120.51 (12)
N4—N3—H3B	118.3	N1—C7—C6	118.45 (12)
N3—N4—H4C	107.2 (11)	N1—C7—C8	122.77 (11)
N3—N4—H4B	105.6 (11)	C6—C7—C8	118.78 (11)
H4C—N4—H4B	108.0 (16)	O1—C8—N3	124.14 (12)
C6—C1—C2	120.39 (14)	O1—C8—C7	121.45 (11)
C6—C1—H1A	119.8	N3—C8—C7	114.37 (10)
C2—C1—H1A	119.8	O2—C9—N2	119.50 (13)
C3—C2—C1	120.44 (15)	O2—C9—C10	122.00 (12)
C3—C2—H2A	119.8	N2—C9—C10	118.49 (12)
C1—C2—H2A	119.8	C9—C10—H10A	109.5
C2—C3—C4	119.58 (14)	C9—C10—H10B	109.5
C2—C3—H3A	120.2	H10A—C10—H10B	109.5
C4—C3—H3A	120.2	C9—C10—H10C	109.5
C5—C4—C3	120.55 (15)	H10A—C10—H10C	109.5
C5—C4—H4A	119.7	H10B—C10—H10C	109.5
C3—C4—H4A	119.7
C7—N1—N2—C9	−169.43 (11)	C5—C6—C7—N1	−11.5 (2)
C6—C1—C2—C3	−0.2 (3)	C1—C6—C7—C8	−10.55 (19)
C1—C2—C3—C4	0.0 (3)	C5—C6—C7—C8	169.07 (13)
C2—C3—C4—C5	−0.2 (3)	N4—N3—C8—O1	3.72 (19)
C3—C4—C5—C6	0.6 (3)	N4—N3—C8—C7	−174.25 (11)
C2—C1—C6—C5	0.7 (2)	N1—C7—C8—O1	−106.29 (15)
C2—C1—C6—C7	−179.71 (14)	C6—C7—C8—O1	73.11 (15)
C4—C5—C6—C1	−0.9 (2)	N1—C7—C8—N3	71.75 (15)
C4—C5—C6—C7	179.52 (15)	C6—C7—C8—N3	−108.85 (13)
N2—N1—C7—C6	−178.31 (11)	N1—N2—C9—O2	−177.76 (12)
N2—N1—C7—C8	1.09 (19)	N1—N2—C9—C10	2.8 (2)
C1—C6—C7—N1	168.88 (13)

Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
N2—H2B···O2^i	0.88	2.09	2.9512 (16)	167
N3—H3B···O1^ii	0.88	2.08	2.8450 (15)	145
N4—H4B···O2^i	0.90 (2)	2.396 (19)	3.0903 (19)	134.5 (15)
N4—H4C···O1^iii	0.890 (18)	2.274 (18)	3.0514 (19)	145.8 (15)

Symmetry codes: (i) −x+1, −y+2, −z+1; (ii) x, y−1, z; (iii) −x+1, y−1/2, −z+1/2.