Di­methyl di­spiro­[tri­cyclo­[3.3.1.13,7]­decane-1,2′-bi­cyclo­[1.1.0]­butane-4′,1′′-tri­cyclo­[3.3.1.13,7]­decane]-1′,3′-di­carboxyl­ate, a strain-enhanced bicyclo[1.1.0]­butane with a very short intramolecular C—H⋯H—C contact

Bats, J.W.; Bolte, M.; Grundl, M.A.; Hashmi, A.S.K.

doi:10.1107/S010827010100004X

Dimethyl dispiro[tricyclo[3.3.1.1^3,7]decane-1,2'-bicyclo[1.1.0]butane-4',1''-tricyclo[3.3.1.1^3,7]decane]-1',3'-dicarboxylate, a strain-enhanced bicyclo[1.1.0]butane with a very short intramolecular C-HH-C contact

J. W. Bats, M. Bolte, M. A. Grundl and A. S. K. Hashmi

The title molecule, C₂₆H₃₄O₄, shows a very short repulsive intramolecular C-H

H-C contact, with an H

H distance of only 1.71 Å. The flap angle [varphi]

of the bicyclo[1.1.0]butane group is widened to 131.23 (8)°. Both methylene C atoms show tilt angles of 6.1°. Bond lengths in the fused cyclopropane rings range from 1.501 (1) to 1.542 (1) Å and are influenced by [pi]

interactions with the carboxylate substituents.

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S010827010100004X/sk1443sup1.cif Contains datablocks global, I
	Structure factor file (CIF format) https://doi.org/10.1107/S010827010100004X/sk1443Isup2.hkl Contains datablock I

CCDC reference: 163919

Computing details top

Data collection: SMART (Siemens, 1995); cell refinement: SMART; data reduction: SAINT (Siemens, 1995); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: XP in SHELXTL (Sheldrick, 1996); software used to prepare material for publication: CIF in SHELXL97.

Dimethyl dispiro[tricyclo[3.3.1.1^3,7]decan-1,2'-bicyclo[1.1.0]butan-4',1"- tricyclo[3.3.1.1^3,7]decane]-1',3'-dicarboxylate top

Crystal data top

C₂₆H₃₄O₄	Z = 2
M_r = 410.53	F(000) = 444
Triclinic, P1	D_x = 1.315 Mg m⁻³
a = 9.710 (2) Å	Mo Kα radiation, λ = 0.71073 Å
b = 10.3412 (12) Å	Cell parameters from 154 reflections
c = 11.051 (2) Å	θ = 3–23°
α = 89.442 (11)°	µ = 0.09 mm⁻¹
β = 82.317 (14)°	T = 143 K
γ = 70.628 (8)°	Block, colorless
V = 1036.7 (3) Å³	0.48 × 0.40 × 0.28 mm

Data collection top

Siemens SMART diffractometer	5993 independent reflections
Radiation source: normal-focus sealed tube	5005 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.039
ω scans	θ_max = 31.0°, θ_min = 1.9°
Absorption correction: numerical using 7 indexed faces (SHELXTL; Sheldrick, 1996)	h = −13→13
T_min = 0.952, T_max = 0.979	k = −15→14
18851 measured reflections	l = −14→15

Refinement top

Refinement on F²	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: difference Fourier map
R[F² > 2σ(F²)] = 0.040	H-atom parameters constrained
wR(F²) = 0.108	w = 1/[σ²(F_o²) + (0.05P)² + 0.3P] where P = (F_o² + 2F_c²)/3
S = 1.06	(Δ/σ)_max < 0.001
5993 reflections	Δρ_max = 0.37 e Å⁻³
274 parameters	Δρ_min = −0.22 e Å⁻³
0 restraints	Extinction correction: SHELXL97, Fc^*=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4
Primary atom site location: structure-invariant direct methods	Extinction coefficient: 0.010 (2)

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
O1	0.42055 (8)	0.32625 (8)	0.57659 (7)	0.02072 (16)
O2	0.25334 (9)	0.24662 (10)	0.51236 (8)	0.0295 (2)
O3	0.37319 (11)	0.09580 (9)	0.12022 (8)	0.0303 (2)
O4	0.42088 (11)	0.00529 (9)	0.30046 (9)	0.0345 (2)
C1	0.35946 (12)	0.31470 (12)	0.70090 (10)	0.0227 (2)
H1A	0.4143	0.3441	0.7570	0.036*
H1B	0.3669	0.2191	0.7152	0.036*
H1C	0.2557	0.3731	0.7150	0.036*
C2	0.35698 (10)	0.28582 (10)	0.49006 (9)	0.01687 (19)
C3	0.43031 (10)	0.30462 (10)	0.36752 (9)	0.01465 (18)
C4	0.45481 (10)	0.22145 (10)	0.24934 (9)	0.01527 (18)
C5	0.41527 (11)	0.09617 (10)	0.23112 (10)	0.0188 (2)
C6	0.32966 (17)	−0.01992 (14)	0.09111 (13)	0.0390 (3)
H6A	0.2767	0.0001	0.0199	0.062*
H6B	0.2652	−0.0368	0.1611	0.062*
H6C	0.4176	−0.1014	0.0726	0.062*
C7	0.35160 (10)	0.36726 (10)	0.25817 (9)	0.01417 (18)
C8	0.37632 (10)	0.48833 (10)	0.18828 (9)	0.01560 (18)
H8	0.4838	0.4766	0.1765	0.019*
C9	0.28983 (12)	0.62223 (10)	0.26257 (10)	0.0203 (2)
H9A	0.3235	0.6183	0.3436	0.024*
H9B	0.3081	0.7007	0.2197	0.024*
C10	0.12491 (12)	0.64259 (11)	0.27870 (10)	0.0212 (2)
H10	0.0689	0.7296	0.3272	0.025*
C11	0.07358 (11)	0.64998 (11)	0.15280 (10)	0.0230 (2)
H11A	−0.0335	0.6652	0.1625	0.028*
H11B	0.0916	0.7279	0.1087	0.028*
C12	0.15783 (11)	0.51578 (11)	0.07917 (9)	0.0204 (2)
H12	0.1237	0.5200	−0.0027	0.025*
C13	0.13139 (11)	0.39529 (11)	0.14811 (10)	0.0207 (2)
H13A	0.1842	0.3089	0.0996	0.025*
H13B	0.0248	0.4078	0.1597	0.025*
C14	0.18625 (10)	0.38593 (10)	0.27338 (9)	0.01628 (19)
H14	0.1683	0.3071	0.3178	0.020*
C15	0.10014 (11)	0.52073 (11)	0.34696 (9)	0.0199 (2)
H15A	−0.0063	0.5327	0.3595	0.024*
H15B	0.1334	0.5169	0.4282	0.024*
C16	0.32288 (11)	0.49341 (11)	0.06308 (9)	0.0192 (2)
H16A	0.3429	0.5690	0.0165	0.023*
H16B	0.3773	0.4063	0.0161	0.023*
C17	0.58552 (10)	0.22727 (10)	0.31183 (9)	0.01446 (18)
C18	0.69998 (10)	0.29134 (10)	0.25623 (9)	0.01571 (18)
H18	0.6490	0.3806	0.2200	0.019*
C19	0.78388 (11)	0.31636 (10)	0.35730 (10)	0.01844 (19)
H19A	0.8543	0.3623	0.3231	0.022*
H19B	0.7134	0.3774	0.4227	0.022*
C20	0.86764 (11)	0.18011 (11)	0.41104 (10)	0.0199 (2)
H20	0.9242	0.1972	0.4748	0.024*
C21	0.97368 (11)	0.08379 (11)	0.30920 (10)	0.0210 (2)
H21A	1.0462	0.1259	0.2715	0.025*
H21B	1.0282	−0.0040	0.3439	0.025*
C22	0.88707 (11)	0.05673 (10)	0.21186 (10)	0.0189 (2)
H22	0.9563	−0.0076	0.1465	0.023*
C23	0.77315 (11)	−0.00646 (10)	0.27077 (10)	0.0187 (2)
H23A	0.8241	−0.0948	0.3065	0.022*
H23B	0.7177	−0.0247	0.2078	0.022*
C24	0.66555 (10)	0.09231 (10)	0.37140 (9)	0.01657 (19)
H24	0.5918	0.0504	0.4095	0.020*
C25	0.75475 (11)	0.11592 (11)	0.46857 (9)	0.0197 (2)
H25A	0.6875	0.1775	0.5353	0.024*
H25B	0.8060	0.0274	0.5039	0.024*
C26	0.80737 (11)	0.19318 (10)	0.15616 (9)	0.01813 (19)
H26A	0.8803	0.2347	0.1182	0.022*
H26B	0.7526	0.1768	0.0918	0.022*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
O1	0.0228 (4)	0.0253 (4)	0.0160 (3)	−0.0119 (3)	0.0008 (3)	−0.0013 (3)
O2	0.0273 (4)	0.0459 (5)	0.0245 (4)	−0.0233 (4)	−0.0077 (3)	0.0145 (4)
O3	0.0477 (5)	0.0270 (4)	0.0242 (4)	−0.0224 (4)	−0.0067 (4)	−0.0036 (3)
O4	0.0429 (5)	0.0250 (4)	0.0464 (5)	−0.0212 (4)	−0.0192 (4)	0.0140 (4)
C1	0.0262 (5)	0.0254 (5)	0.0167 (5)	−0.0103 (4)	0.0008 (4)	0.0012 (4)
C2	0.0157 (4)	0.0148 (4)	0.0193 (5)	−0.0036 (3)	−0.0038 (3)	0.0053 (3)
C3	0.0140 (4)	0.0141 (4)	0.0165 (4)	−0.0051 (3)	−0.0035 (3)	0.0033 (3)
C4	0.0149 (4)	0.0139 (4)	0.0178 (4)	−0.0054 (3)	−0.0033 (3)	0.0021 (3)
C5	0.0145 (4)	0.0157 (4)	0.0261 (5)	−0.0056 (3)	−0.0016 (4)	0.0002 (4)
C6	0.0529 (8)	0.0343 (7)	0.0393 (7)	−0.0273 (6)	−0.0047 (6)	−0.0125 (6)
C7	0.0132 (4)	0.0146 (4)	0.0154 (4)	−0.0050 (3)	−0.0036 (3)	0.0023 (3)
C8	0.0137 (4)	0.0167 (4)	0.0169 (4)	−0.0052 (3)	−0.0035 (3)	0.0049 (3)
C9	0.0242 (5)	0.0160 (5)	0.0219 (5)	−0.0072 (4)	−0.0057 (4)	0.0032 (4)
C10	0.0211 (5)	0.0173 (5)	0.0204 (5)	−0.0009 (4)	−0.0012 (4)	0.0020 (4)
C11	0.0166 (4)	0.0244 (5)	0.0239 (5)	−0.0012 (4)	−0.0036 (4)	0.0091 (4)
C12	0.0173 (4)	0.0285 (5)	0.0161 (5)	−0.0070 (4)	−0.0060 (4)	0.0058 (4)
C13	0.0183 (4)	0.0263 (5)	0.0204 (5)	−0.0096 (4)	−0.0077 (4)	0.0033 (4)
C14	0.0133 (4)	0.0190 (5)	0.0176 (4)	−0.0063 (3)	−0.0034 (3)	0.0042 (4)
C15	0.0163 (4)	0.0233 (5)	0.0167 (5)	−0.0029 (4)	−0.0004 (4)	0.0031 (4)
C16	0.0168 (4)	0.0243 (5)	0.0152 (4)	−0.0052 (4)	−0.0021 (3)	0.0046 (4)
C17	0.0134 (4)	0.0139 (4)	0.0170 (4)	−0.0052 (3)	−0.0036 (3)	0.0030 (3)
C18	0.0139 (4)	0.0152 (4)	0.0192 (5)	−0.0059 (3)	−0.0038 (3)	0.0044 (3)
C19	0.0172 (4)	0.0179 (5)	0.0217 (5)	−0.0071 (4)	−0.0042 (4)	−0.0001 (4)
C20	0.0183 (4)	0.0226 (5)	0.0204 (5)	−0.0072 (4)	−0.0078 (4)	0.0026 (4)
C21	0.0144 (4)	0.0212 (5)	0.0260 (5)	−0.0033 (4)	−0.0050 (4)	0.0039 (4)
C22	0.0169 (4)	0.0177 (5)	0.0203 (5)	−0.0040 (4)	−0.0012 (4)	0.0002 (4)
C23	0.0188 (4)	0.0140 (4)	0.0230 (5)	−0.0048 (4)	−0.0040 (4)	0.0021 (4)
C24	0.0156 (4)	0.0146 (4)	0.0193 (5)	−0.0042 (3)	−0.0040 (3)	0.0050 (3)
C25	0.0191 (4)	0.0213 (5)	0.0176 (5)	−0.0046 (4)	−0.0050 (4)	0.0042 (4)
C26	0.0177 (4)	0.0208 (5)	0.0173 (5)	−0.0082 (4)	−0.0026 (4)	0.0029 (4)

Geometric parameters (Å, º) top

O1—C2	1.3442 (13)	C10—C15	1.5326 (15)
O1—C1	1.4420 (13)	C11—C12	1.5324 (16)
O2—C2	1.2001 (13)	C12—C16	1.5272 (14)
O3—C5	1.3431 (14)	C12—C13	1.5299 (15)
O3—C6	1.4470 (14)	C13—C14	1.5394 (14)
O4—C5	1.1986 (13)	C14—C15	1.5397 (15)
C2—C3	1.4857 (14)	C17—C18	1.5329 (13)
C3—C17	1.5006 (13)	C17—C24	1.5443 (13)
C3—C4	1.5182 (14)	C18—C26	1.5337 (14)
C3—C7	1.5387 (13)	C18—C19	1.5384 (14)
C4—C5	1.4907 (13)	C19—C20	1.5336 (14)
C4—C7	1.5039 (13)	C20—C25	1.5279 (15)
C4—C17	1.5417 (13)	C20—C21	1.5332 (15)
C7—C8	1.5338 (13)	C21—C22	1.5319 (15)
C7—C14	1.5382 (13)	C22—C23	1.5340 (14)
C8—C16	1.5360 (14)	C22—C26	1.5346 (14)
C8—C9	1.5372 (14)	C23—C24	1.5412 (14)
C9—C10	1.5301 (15)	C24—C25	1.5353 (14)
C10—C11	1.5323 (15)

C2—O1—C1	115.45 (8)	C12—C11—C10	109.63 (8)
C5—O3—C6	115.46 (10)	C16—C12—C13	108.24 (8)
O2—C2—O1	123.42 (10)	C16—C12—C11	109.64 (9)
O2—C2—C3	127.21 (10)	C13—C12—C11	109.70 (9)
O1—C2—C3	109.30 (8)	C12—C13—C14	110.27 (8)
C2—C3—C17	126.86 (8)	C7—C14—C13	110.73 (8)
C2—C3—C4	129.16 (8)	C7—C14—C15	108.79 (8)
C17—C3—C4	61.42 (6)	C13—C14—C15	108.19 (8)
C2—C3—C7	125.72 (8)	C10—C15—C14	110.18 (8)
C17—C3—C7	104.41 (8)	C12—C16—C8	110.23 (8)
C4—C3—C7	58.93 (6)	C3—C17—C18	125.79 (8)
C5—C4—C7	126.45 (8)	C3—C17—C4	59.85 (6)
C5—C4—C3	127.32 (8)	C18—C17—C4	124.24 (8)
C7—C4—C3	61.21 (6)	C3—C17—C24	116.95 (8)
C5—C4—C17	125.54 (8)	C18—C17—C24	108.80 (8)
C7—C4—C17	104.10 (7)	C4—C17—C24	113.76 (8)
C3—C4—C17	58.73 (6)	C17—C18—C26	109.11 (8)
O4—C5—O3	122.72 (10)	C17—C18—C19	109.05 (8)
O4—C5—C4	127.59 (10)	C26—C18—C19	110.13 (8)
O3—C5—C4	109.68 (9)	C20—C19—C18	110.41 (8)
C4—C7—C8	126.51 (8)	C25—C20—C21	109.81 (9)
C4—C7—C14	115.84 (8)	C25—C20—C19	108.00 (8)
C8—C7—C14	108.62 (7)	C21—C20—C19	109.67 (8)
C4—C7—C3	59.85 (6)	C22—C21—C20	109.86 (8)
C8—C7—C3	123.88 (8)	C21—C22—C23	109.61 (9)
C14—C7—C3	114.88 (8)	C21—C22—C26	108.96 (8)
C7—C8—C16	109.60 (8)	C23—C22—C26	109.35 (8)
C7—C8—C9	109.12 (8)	C22—C23—C24	109.99 (8)
C16—C8—C9	109.81 (8)	C25—C24—C23	108.22 (8)
C10—C9—C8	109.81 (8)	C25—C24—C17	111.68 (8)
C9—C10—C11	109.27 (9)	C23—C24—C17	108.20 (8)
C9—C10—C15	108.37 (8)	C20—C25—C24	109.88 (8)
C11—C10—C15	110.22 (9)	C18—C26—C22	109.62 (8)

C1—O1—C2—O2	2.33 (14)	C3—C7—C14—C15	82.83 (10)
C1—O1—C2—C3	179.55 (8)	C12—C13—C14—C7	−58.93 (11)
O2—C2—C3—C17	−115.47 (12)	C12—C13—C14—C15	60.20 (10)
O1—C2—C3—C17	67.45 (12)	C9—C10—C15—C14	−60.14 (11)
O2—C2—C3—C4	−34.71 (16)	C11—C10—C15—C14	59.39 (11)
O1—C2—C3—C4	148.21 (9)	C7—C14—C15—C10	60.88 (10)
O2—C2—C3—C7	41.76 (16)	C13—C14—C15—C10	−59.47 (10)
O1—C2—C3—C7	−135.33 (9)	C13—C12—C16—C8	−60.88 (11)
C2—C3—C4—C5	−2.84 (16)	C11—C12—C16—C8	58.76 (11)
C17—C3—C4—C5	113.09 (11)	C7—C8—C16—C12	61.76 (11)
C7—C3—C4—C5	−115.69 (11)	C9—C8—C16—C12	−58.09 (11)
C2—C3—C4—C7	112.85 (11)	C2—C3—C17—C18	−128.09 (11)
C17—C3—C4—C7	−131.22 (8)	C4—C3—C17—C18	112.55 (10)
C2—C3—C4—C17	−115.93 (11)	C7—C3—C17—C18	70.85 (11)
C7—C3—C4—C17	131.22 (8)	C2—C3—C17—C4	119.37 (11)
C6—O3—C5—O4	2.11 (16)	C7—C3—C17—C4	−41.70 (7)
C6—O3—C5—C4	−179.21 (10)	C2—C3—C17—C24	16.22 (14)
C7—C4—C5—O4	−115.56 (13)	C4—C3—C17—C24	−103.15 (9)
C3—C4—C5—O4	−36.50 (17)	C7—C3—C17—C24	−144.84 (8)
C17—C4—C5—O4	38.57 (17)	C5—C4—C17—C3	−115.96 (11)
C7—C4—C5—O3	65.84 (13)	C7—C4—C17—C3	42.82 (7)
C3—C4—C5—O3	144.90 (10)	C5—C4—C17—C18	129.03 (10)
C17—C4—C5—O3	−140.03 (10)	C7—C4—C17—C18	−72.19 (11)
C5—C4—C7—C8	−131.14 (11)	C3—C4—C17—C18	−115.01 (10)
C3—C4—C7—C8	111.85 (10)	C5—C4—C17—C24	−7.48 (13)
C17—C4—C7—C8	70.34 (11)	C7—C4—C17—C24	151.30 (8)
C5—C4—C7—C14	11.97 (14)	C3—C4—C17—C24	108.48 (9)
C3—C4—C7—C14	−105.03 (9)	C3—C17—C18—C26	−151.18 (9)
C17—C4—C7—C14	−146.55 (8)	C4—C17—C18—C26	−76.14 (11)
C5—C4—C7—C3	117.00 (11)	C24—C17—C18—C26	62.15 (10)
C17—C4—C7—C3	−41.52 (7)	C3—C17—C18—C19	88.50 (11)
C2—C3—C7—C4	−118.35 (11)	C4—C17—C18—C19	163.53 (8)
C17—C3—C7—C4	43.00 (7)	C24—C17—C18—C19	−58.18 (10)
C2—C3—C7—C8	125.63 (10)	C17—C18—C19—C20	62.27 (10)
C17—C3—C7—C8	−73.03 (11)	C26—C18—C19—C20	−57.43 (10)
C4—C3—C7—C8	−116.02 (10)	C18—C19—C20—C25	−62.07 (11)
C2—C3—C7—C14	−11.71 (13)	C18—C19—C20—C21	57.57 (10)
C17—C3—C7—C14	149.63 (8)	C25—C20—C21—C22	58.85 (11)
C4—C3—C7—C14	106.64 (9)	C19—C20—C21—C22	−59.68 (11)
C4—C7—C8—C16	86.22 (11)	C20—C21—C22—C23	−58.47 (11)
C14—C7—C8—C16	−59.03 (10)	C20—C21—C22—C26	61.16 (11)
C3—C7—C8—C16	161.41 (8)	C21—C22—C23—C24	59.82 (10)
C4—C7—C8—C9	−153.50 (9)	C26—C22—C23—C24	−59.57 (11)
C14—C7—C8—C9	61.25 (10)	C22—C23—C24—C25	−60.47 (10)
C3—C7—C8—C9	−78.31 (11)	C22—C23—C24—C17	60.71 (10)
C7—C8—C9—C10	−61.50 (10)	C3—C17—C24—C25	−92.73 (10)
C16—C8—C9—C10	58.65 (10)	C18—C17—C24—C25	57.28 (10)
C8—C9—C10—C11	−59.94 (11)	C4—C17—C24—C25	−159.67 (8)
C8—C9—C10—C15	60.19 (11)	C3—C17—C24—C23	148.27 (8)
C9—C10—C11—C12	60.61 (11)	C18—C17—C24—C23	−61.72 (10)
C15—C10—C11—C12	−58.38 (11)	C4—C17—C24—C23	81.33 (10)
C10—C11—C12—C16	−60.01 (11)	C21—C20—C25—C24	−60.37 (10)
C10—C11—C12—C13	58.73 (11)	C19—C20—C25—C24	59.18 (11)
C16—C12—C13—C14	59.16 (11)	C23—C24—C25—C20	60.66 (10)
C11—C12—C13—C14	−60.44 (11)	C17—C24—C25—C20	−58.33 (11)
C4—C7—C14—C13	−91.39 (10)	C17—C18—C26—C22	−60.80 (10)
C8—C7—C14—C13	58.01 (10)	C19—C18—C26—C22	58.86 (10)
C3—C7—C14—C13	−158.41 (8)	C21—C22—C26—C18	−60.59 (10)
C4—C7—C14—C15	149.84 (8)	C23—C22—C26—C18	59.20 (10)
C8—C7—C14—C15	−60.76 (10)

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
C1—H1B···O4ⁱ	0.98	2.53	3.288 (2)	134
C13—H13A···O3	0.99	2.39	3.194 (2)	138
C14—H14···O2	1.00	2.41	3.039 (2)	120
C23—H23A···O2ⁱ	0.99	2.71	3.482 (2)	135
C24—H24···O4	1.00	2.34	3.000 (2)	122
C25—H25A···O1	0.99	2.52	3.320 (2)	138

Symmetry code: (i) −x+1, −y, −z+1.

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Di­methyl di­spiro­[tri­cyclo­[3.3.1.13,7]­decane-1,2'-bi­cyclo­[1.1.0]­butane-4',1''-tri­cyclo­[3.3.1.13,7]­decane]-1',3'-di­carboxyl­ate, a strain-enhanced bicyclo[1.1.0]­butane with a very short intramolecular C-HH-C contact

Supporting information

Dimethyl dispiro[tricyclo[3.3.1.1^3,7]decane-1,2'-bicyclo[1.1.0]butane-4',1''-tricyclo[3.3.1.1^3,7]decane]-1',3'-dicarboxylate, a strain-enhanced bicyclo[1.1.0]butane with a very short intramolecular C-HH-C contact