##############################################################################
###                                                                        ###
###        Electronic paper (Acta Crystallographica Section E)             ###
###                                                                        ###
##############################################################################
#                                                                            #
# This CIF contains the data in a paper accepted for publication in Acta     #
# Crystallographica Section E. It conforms to the requirements of Notes      #
# for Authors for Section E, and has been peer reviewed under the auspices   #
# of the IUCr Commission on Journals.                                        #
#                                                                            #
# Full details of the Crystallographic Information File format               #
# are given in the paper "The Crystallographic Information File (CIF):       #
# a New Standard Archive File for Crystallography" by S. R. Hall, F. H.      #
# Allen and I. D. Brown [Acta Cryst. (1991), A47, 655-685].                  #
#                                                                            #
# The current version of the core CIF dictionary is obtainable from          #
# ftp://ftp.iucr.org/pub/cif_core.dic. The current version number is 2.1.    #
#                                                                            #
# Software is freely available for graphical display of the structure(s) in  #
# this CIF.  For information consult the CIF home page http://www.iucr.org/  #
# cif/home.html                                                              #
#                                                                            #
#            Copyright International Union of Crystallography                #
#                                                                            #
##############################################################################
                                             
data_I
_audit_creation_method     SHELXL-97
_chemical_name_systematic
;
Methyl 3,3,7,7,9-pentamethyl-1,5-dioxaspiro[5.5]undec-8-ene-8-carboxylate
;
_chemical_name_common
;
;
_chemical_formula_moiety     'C16 H26 O4'
_chemical_formula_sum     'C16 H26 O4'
_chemical_formula_weight     282.37
_chemical_melting_point     ?
_symmetry_cell_setting     monoclinic
_symmetry_space_group_name_H-M     'P 21/n'
_symmetry_space_group_name_Hall     '-P 2yn'
loop_
    _symmetry_equiv_pos_as_xyz
    'x, y, z'
    '-x+1/2, y+1/2, -z+1/2'
    '-x, -y, -z'
    'x-1/2, -y-1/2, z-1/2'
_cell_length_a     10.735(2)
_cell_length_b     9.4311(19)
_cell_length_c     16.610(3)
_cell_angle_alpha     90.00
_cell_angle_beta     106.81(3)
_cell_angle_gamma     90.00
_cell_volume     1609.7(6)
_cell_formula_units_Z     4
_cell_measurement_reflns_used     2855
_cell_measurement_theta_min     2.51
_cell_measurement_theta_max     26.00
_cell_measurement_temperature     150(2)
_exptl_crystal_description     block
_exptl_crystal_colour     colourless
_exptl_crystal_size_max     0.20
_exptl_crystal_size_mid     0.20
_exptl_crystal_size_min     0.15
_exptl_crystal_density_diffrn     1.165
_exptl_crystal_density_meas     ?
_exptl_crystal_density_method     'not measured'
_exptl_crystal_F_000     616
_exptl_absorpt_coefficient_mu     0.082
_exptl_absorpt_correction_type     none
_exptl_absorpt_process_details     ?
_exptl_absorpt_correction_T_min     ?
_exptl_absorpt_correction_T_max     ?
_exptl_special_details
;
;
_diffrn_ambient_temperature     150(2)
_diffrn_radiation_type     MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_radiation_source     'fine-focus sealed tube'
_diffrn_radiation_monochromator     graphite
_diffrn_measurement_device_type     'Bruker--Nonius KappaCCD'
_diffrn_measurement_method     'φ scans, and ω scans with κ offsets'
_diffrn_detector_area_resol_mean     ?
_diffrn_reflns_number     20225
_diffrn_reflns_av_R_equivalents     0.0393
_diffrn_reflns_av_sigmaI/netI     0.0231
_diffrn_reflns_theta_min     2.51
_diffrn_reflns_theta_max     26.00
_diffrn_reflns_theta_full     26.00
_diffrn_measured_fraction_theta_max     0.989
_diffrn_measured_fraction_theta_full     0.989
_diffrn_reflns_limit_h_min     -13
_diffrn_reflns_limit_h_max     13
_diffrn_reflns_limit_k_min     -11
_diffrn_reflns_limit_k_max     11
_diffrn_reflns_limit_l_min     -20
_diffrn_reflns_limit_l_max     20
_diffrn_standards_number     0
_diffrn_standards_interval_count     ?
_diffrn_standards_interval_time     ?
_diffrn_standards_decay_%     0
_refine_special_details
;
 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 > 2sigma(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.
;
_reflns_number_total     3133
_reflns_number_gt     2855
_reflns_threshold_expression     I>2σ(I)
_refine_ls_structure_factor_coef     Fsqd
_refine_ls_matrix_type     full
_refine_ls_R_factor_all     0.0429
_refine_ls_R_factor_gt     0.0379
_refine_ls_wR_factor_gt     0.1081
_refine_ls_wR_factor_ref     0.1197
_refine_ls_goodness_of_fit_ref     1.083
_refine_ls_restrained_S_all     1.083
_refine_ls_number_reflns     3133
_refine_ls_number_parameters     187
_refine_ls_number_restraints     0
_refine_ls_hydrogen_treatment     constr
_refine_ls_weighting_scheme     calc
_refine_ls_weighting_details
          'w = 1/[σ²(Fo²)+(0.0656P)²+0.4495P] where P = (Fo²+2Fc²)/3'
_atom_sites_solution_hydrogens     geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary     difmap
_refine_ls_shift/su_max     0.001
_refine_ls_shift/su_mean     0.000
_refine_diff_density_max     0.275
_refine_diff_density_min     -0.227
_refine_ls_extinction_method     none
_refine_ls_extinction_coef     ?
loop_
    _atom_type_symbol
    _atom_type_description
    _atom_type_scat_dispersion_real
    _atom_type_scat_dispersion_imag
    _atom_type_scat_source
    'C' 'C' 0.0033 0.0016
                         'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
    'H' 'H' 0.0000 0.0000
                         'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
    'O' 'O' 0.0106 0.0060
                         'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
_computing_data_collection     'COLLECT (Nonius, 1998)'
_computing_cell_refinement     'DENZO--SMN (Otwinowski & Minor, 1997)'
_computing_data_reduction     DENZO--SMN
_computing_structure_solution     'SHELXS97 (Sheldrick, 1997)'
_computing_structure_refinement     'SHELXL97 (Sheldrick, 1997)'
_computing_molecular_graphics     'DIAMOND (Brandenburg & Berndt, 1999)'
_computing_publication_material     'WinGX (Farrugia, 1999)'
loop_
    _atom_site_label
    _atom_site_fract_x
    _atom_site_fract_y
    _atom_site_fract_z
    _atom_site_U_iso_or_equiv
    _atom_site_adp_type
    _atom_site_calc_flag
    _atom_site_refinement_flags
    _atom_site_occupancy
    _atom_site_disorder_assembly
    _atom_site_disorder_group
    _atom_site_type_symbol
    O1 0.75398(9) 0.64300(9) 0.38230(6) 0.0318(2) Uani d . 1 . . O
    O2 0.65704(9) 0.53065(10) 0.26149(6) 0.0343(3) Uani d . 1 . . O
    O3 0.78460(8) 0.26792(9) 0.54633(5) 0.0243(2) Uani d . 1 . . O
    O4 0.64592(8) 0.08847(9) 0.47386(5) 0.0231(2) Uani d . 1 . . O
    C1 0.70798(16) 0.77650(14) 0.34138(10) 0.0404(4) Uani d . 1 . . C
    H1A 0.7659 0.8074 0.3088 0.061 Uiso calc R 1 . . H
    H1B 0.7072 0.8481 0.3840 0.061 Uiso calc R 1 . . H
    H1C 0.6197 0.7643 0.3037 0.061 Uiso calc R 1 . . H
    C2 0.72235(11) 0.52694(13) 0.33423(8) 0.0239(3) Uani d . 1 . . C
    C3 0.77542(11) 0.39450(12) 0.38163(7) 0.0217(3) Uani d . 1 . . C
    C4 0.67248(11) 0.29951(12) 0.40178(7) 0.0219(3) Uani d . 1 . . C
    C5 0.59425(12) 0.22202(14) 0.32131(8) 0.0312(3) Uani d . 1 . . C
    H5A 0.5577 0.2916 0.2770 0.047 Uiso calc R 1 . . H
    H5B 0.5235 0.1679 0.3330 0.047 Uiso calc R 1 . . H
    H5C 0.6518 0.1572 0.3027 0.047 Uiso calc R 1 . . H
    C6 0.57748(13) 0.39025(14) 0.43399(9) 0.0316(3) Uani d . 1 . . C
    H6A 0.6267 0.4489 0.4812 0.047 Uiso calc R 1 . . H
    H6B 0.5182 0.3280 0.4527 0.047 Uiso calc R 1 . . H
    H6C 0.5271 0.4515 0.3885 0.047 Uiso calc R 1 . . H
    C7 0.74177(11) 0.19090(12) 0.46971(7) 0.0209(3) Uani d . 1 . . C
    C8 0.85623(11) 0.12211(13) 0.44741(8) 0.0256(3) Uani d . 1 . . C
    H8A 0.8953 0.0482 0.4895 0.031 Uiso calc R 1 . . H
    H8B 0.8249 0.0759 0.3917 0.031 Uiso calc R 1 . . H
    C9 0.95908(11) 0.23240(13) 0.44555(8) 0.0281(3) Uani d . 1 . . C
    H9A 1.0089 0.2563 0.5040 0.034 Uiso calc R 1 . . H
    H9B 1.0206 0.1909 0.4177 0.034 Uiso calc R 1 . . H
    C10 0.90256(11) 0.36605(13) 0.40030(7) 0.0241(3) Uani d . 1 . . C
    C11 1.00054(13) 0.46181(15) 0.37849(9) 0.0325(3) Uani d . 1 . . C
    H11A 0.9571 0.5485 0.3520 0.049 Uiso calc R 1 . . H
    H11B 1.0391 0.4127 0.3395 0.049 Uiso calc R 1 . . H
    H11C 1.0691 0.4865 0.4299 0.049 Uiso calc R 1 . . H
    C12 0.83243(12) 0.18101(15) 0.61941(8) 0.0294(3) Uani d . 1 . . C
    H12A 0.8574 0.2419 0.6701 0.035 Uiso calc R 1 . . H
    H12B 0.9111 0.1297 0.6158 0.035 Uiso calc R 1 . . H
    C13 0.72977(12) 0.07400(14) 0.62756(8) 0.0285(3) Uani d . 1 . . C
    C14 0.61380(14) 0.15036(16) 0.64377(9) 0.0349(3) Uani d . 1 . . C
    H14A 0.5798 0.2209 0.5995 0.052 Uiso calc R 1 . . H
    H14B 0.6417 0.1978 0.6985 0.052 Uiso calc R 1 . . H
    H14C 0.5455 0.0813 0.6436 0.052 Uiso calc R 1 . . H
    C15 0.78986(15) -0.03074(18) 0.69863(9) 0.0420(4) Uani d . 1 . . C
    H15A 0.7267 -0.1055 0.6992 0.063 Uiso calc R 1 . . H
    H15B 0.8132 0.0194 0.7526 0.063 Uiso calc R 1 . . H
    H15C 0.8681 -0.0731 0.6896 0.063 Uiso calc R 1 . . H
    C16 0.68573(12) -0.00627(13) 0.54427(8) 0.0258(3) Uani d . 1 . . C
    H16A 0.7581 -0.0663 0.5382 0.031 Uiso calc R 1 . . H
    H16B 0.6122 -0.0694 0.5447 0.031 Uiso calc R 1 . . H
loop_
    _atom_site_aniso_label
    _atom_site_aniso_U_11
    _atom_site_aniso_U_22
    _atom_site_aniso_U_33
    _atom_site_aniso_U_12
    _atom_site_aniso_U_13
    _atom_site_aniso_U_23
    O1 0.0421(5) 0.0206(4) 0.0311(5) -0.0015(4) 0.0081(4) -0.0003(3)
    O2 0.0435(6) 0.0294(5) 0.0252(5) 0.0021(4) 0.0026(4) 0.0037(4)
    O3 0.0248(4) 0.0258(4) 0.0196(4) -0.0048(3) 0.0022(3) -0.0005(3)
    O4 0.0213(4) 0.0226(4) 0.0231(4) -0.0046(3) 0.0027(3) 0.0031(3)
    C1 0.0582(9) 0.0212(7) 0.0458(8) 0.0058(6) 0.0212(7) 0.0034(6)
    C2 0.0240(6) 0.0234(6) 0.0255(6) -0.0014(5) 0.0090(5) 0.0004(5)
    C3 0.0234(6) 0.0212(6) 0.0197(5) -0.0027(4) 0.0048(4) -0.0008(4)
    C4 0.0190(5) 0.0224(6) 0.0232(6) -0.0007(4) 0.0040(4) 0.0022(5)
    C5 0.0286(6) 0.0335(7) 0.0255(6) -0.0092(5) -0.0015(5) 0.0043(5)
    C6 0.0267(6) 0.0323(7) 0.0385(7) 0.0075(5) 0.0137(5) 0.0093(6)
    C7 0.0191(5) 0.0210(6) 0.0210(6) -0.0035(4) 0.0033(4) -0.0002(4)
    C8 0.0234(6) 0.0236(6) 0.0298(6) 0.0025(5) 0.0076(5) 0.0032(5)
    C9 0.0199(6) 0.0308(7) 0.0337(7) 0.0025(5) 0.0080(5) 0.0043(5)
    C10 0.0233(6) 0.0252(6) 0.0238(6) -0.0030(5) 0.0067(5) -0.0013(5)
    C11 0.0269(6) 0.0341(7) 0.0376(7) -0.0063(5) 0.0111(5) 0.0027(6)
    C12 0.0255(6) 0.0376(7) 0.0210(6) -0.0065(5) 0.0003(5) 0.0037(5)
    C13 0.0262(6) 0.0338(7) 0.0233(6) -0.0040(5) 0.0037(5) 0.0056(5)
    C14 0.0352(7) 0.0402(8) 0.0319(7) -0.0065(6) 0.0140(6) -0.0030(6)
    C15 0.0367(8) 0.0529(9) 0.0316(8) -0.0051(7) 0.0022(6) 0.0168(7)
    C16 0.0245(6) 0.0249(6) 0.0264(6) -0.0011(5) 0.0048(5) 0.0061(5)
_geom_special_details
;
 All esds (except the esd in the dihedral angle between two l.s. planes)
 are estimated using the full covariance matrix.  The cell esds are taken
 into account individually in the estimation of esds in distances, angles
 and torsion angles; correlations between esds in cell parameters are only
 used when they are defined by crystal symmetry.  An approximate (isotropic)
 treatment of cell esds is used for estimating esds involving l.s. planes.
;
loop_
    _geom_bond_atom_site_label_1
    _geom_bond_atom_site_label_2
    _geom_bond_site_symmetry_2
    _geom_bond_distance
    _geom_bond_publ_flag
    O1 C2 . 1.3394(15) yes
    O1 C1 . 1.4481(16) yes
    O2 C2 . 1.2094(16) yes
    O3 C7 . 1.4214(14) no
    O3 C12 . 1.4311(15) no
    O4 C7 . 1.4275(13) no
    O4 C16 . 1.4352(14) no
    C1 H1A . 0.9800 no
    C1 H1B . 0.9800 no
    C1 H1C . 0.9800 no
    C2 C3 . 1.4984(17) yes
    C3 C10 . 1.3364(17) yes
    C3 C4 . 1.5328(15) yes
    C4 C5 . 1.5416(17) yes
    C4 C6 . 1.5409(17) yes
    C4 C7 . 1.5460(16) no
    C5 H5A . 0.9800 no
    C5 H5B . 0.9800 no
    C5 H5C . 0.9800 no
    C6 H6A . 0.9800 no
    C6 H6B . 0.9800 no
    C6 H6C . 0.9800 no
    C7 C8 . 1.5268(16) no
    C8 C9 . 1.5237(17) no
    C8 H8A . 0.9900 no
    C8 H8B . 0.9900 n0
    C9 C10 . 1.5026(17) yes
    C9 H9A . 0.9900 no
    C9 H9B . 0.9900 no
    C10 C11 . 1.5078(17) yes
    C11 H11A . 0.9800 no
    C11 H11B . 0.9800 no
    C11 H11C . 0.9800 no
    C12 C13 . 1.5290(17) no
    C12 H12A . 0.9900 no
    C12 H12B . 0.9900 no
    C13 C16 . 1.5271(18) no
    C13 C14 . 1.5279(19) no
    C13 C15 . 1.5312(18) no
    C14 H14A . 0.9800 no
    C14 H14B . 0.9800 no
    C14 H14C . 0.9800 no
    C15 H15A . 0.9800 no
    C15 H15B . 0.9800 no
    C15 H15C . 0.9800 no
    C16 H16A . 0.9900 no
    C16 H16B . 0.9900 no
loop_
    _geom_angle_atom_site_label_1
    _geom_angle_atom_site_label_2
    _geom_angle_atom_site_label_3
    _geom_angle_site_symmetry_1
    _geom_angle_site_symmetry_3
    _geom_angle
    _geom_angle_publ_flag
    C2 O1 C1 . . 115.94(10) no
    C7 O3 C12 . . 114.24(9) no
    C7 O4 C16 . . 114.31(9) no
    O1 C1 H1A . . 109.5 no
    O1 C1 H1B . . 109.5 no
    H1A C1 H1B . . 109.5 no
    O1 C1 H1C . . 109.5 no
    H1A C1 H1C . . 109.5 no
    H1B C1 H1C . . 109.5 no
    O2 C2 O1 . . 123.07(12) no
    O2 C2 C3 . . 124.85(11) no
    O1 C2 C3 . . 112.07(10) no
    C10 C3 C2 . . 119.79(11) no
    C10 C3 C4 . . 125.76(11) no
    C2 C3 C4 . . 114.42(10) no
    C3 C4 C5 . . 109.52(10) no
    C3 C4 C6 . . 110.03(10) no
    C5 C4 C6 . . 108.36(10) no
    C3 C4 C7 . . 108.75(9) no
    C5 C4 C7 . . 110.19(10) no
    C6 C4 C7 . . 109.97(10) no
    C4 C5 H5A . . 109.5 no
    C4 C5 H5B . . 109.5 no
    H5A C5 H5B . . 109.5 no
    C4 C5 H5C . . 109.5 no
    H5A C5 H5C . . 109.5 no
    H5B C5 H5C . . 109.5 no
    C4 C6 H6A . . 109.5 no
    C4 C6 H6B . . 109.5 no
    H6A C6 H6B . . 109.5 no
    C4 C6 H6C . . 109.5 no
    H6A C6 H6C . . 109.5 no
    H6B C6 H6C . . 109.5 no
    O3 C7 O4 . . 110.71(9) no
    O3 C7 C8 . . 111.09(9) no
    O4 C7 C8 . . 111.47(9) no
    O3 C7 C4 . . 106.12(9) no
    O4 C7 C4 . . 106.39(9) no
    C8 C7 C4 . . 110.83(9) no
    C9 C8 C7 . . 110.70(10) no
    C9 C8 H8A . . 109.5 no
    C7 C8 H8A . . 109.5 no
    C9 C8 H8B . . 109.5 no
    C7 C8 H8B . . 109.5 no
    H8A C8 H8B . . 108.1 no
    C10 C9 C8 . . 113.12(10) no
    C10 C9 H9A . . 109.0 no
    C8 C9 H9A . . 109.0 no
    C10 C9 H9B . . 109.0 no
    C8 C9 H9B . . 109.0 no
    H9A C9 H9B . . 107.8 no
    C3 C10 C9 . . 121.46(11) no
    C3 C10 C11 . . 124.09(11) no
    C9 C10 C11 . . 114.44(10) no
    C10 C11 H11A . . 109.5 no
    C10 C11 H11B . . 109.5 no
    H11A C11 H11B . . 109.5 no
    C10 C11 H11C . . 109.5 no
    H11A C11 H11C . . 109.5 no
    H11B C11 H11C . . 109.5 no
    O3 C12 C13 . . 111.23(10) no
    O3 C12 H12A . . 109.4 no
    C13 C12 H12A . . 109.4 no
    O3 C12 H12B . . 109.4 no
    C13 C12 H12B . . 109.4 no
    H12A C12 H12B . . 108.0 no
    C16 C13 C14 . . 109.80(10) no
    C16 C13 C12 . . 106.81(10) no
    C14 C13 C12 . . 110.44(11) no
    C16 C13 C15 . . 109.25(12) no
    C14 C13 C15 . . 110.57(11) no
    C12 C13 C15 . . 109.90(10) no
    C13 C14 H14A . . 109.5 no
    C13 C14 H14B . . 109.5 no
    H14A C14 H14B . . 109.5 no
    C13 C14 H14C . . 109.5 no
    H14A C14 H14C . . 109.5 no
    H14B C14 H14C . . 109.5 no
    C13 C15 H15A . . 109.5 no
    C13 C15 H15B . . 109.5 no
    H15A C15 H15B . . 109.5 no
    C13 C15 H15C . . 109.5 no
    H15A C15 H15C . . 109.5 no
    H15B C15 H15C . . 109.5 no
    O4 C16 C13 . . 111.77(10) no
    O4 C16 H16A . . 109.3 no
    C13 C16 H16A . . 109.3 no
    O4 C16 H16B . . 109.3 no
    C13 C16 H16B . . 109.3 no
    H16A C16 H16B . . 107.9 no
loop_
    _geom_torsion_atom_site_label_1
    _geom_torsion_atom_site_label_2
    _geom_torsion_atom_site_label_3
    _geom_torsion_atom_site_label_4
    _geom_torsion_site_symmetry_1
    _geom_torsion_site_symmetry_2
    _geom_torsion_site_symmetry_3
    _geom_torsion_site_symmetry_4
    _geom_torsion
    _geom_torsion_publ_flag
    C1 O1 C2 O2 . . . . -1.58(17) no
    C1 O1 C2 C3 . . . . 179.32(11) no
    O2 C2 C3 C10 . . . . 107.29(15) yes
    O1 C2 C3 C10 . . . . -73.63(14) no
    O2 C2 C3 C4 . . . . -70.66(15) no
    O1 C2 C3 C4 . . . . 108.42(11) no
    C10 C3 C4 C5 . . . . -103.18(14) no
    C2 C3 C4 C5 . . . . 74.63(13) no
    C10 C3 C4 C6 . . . . 137.80(12) no
    C2 C3 C4 C6 . . . . -44.39(13) no
    C10 C3 C4 C7 . . . . 17.29(16) no
    C2 C3 C4 C7 . . . . -164.90(10) no
    C12 O3 C7 O4 . . . . 55.20(12) no
    C12 O3 C7 C8 . . . . -69.22(12) no
    C12 O3 C7 C4 . . . . 170.24(9) no
    C16 O4 C7 O3 . . . . -54.08(12) no
    C16 O4 C7 C8 . . . . 70.12(12) no
    C16 O4 C7 C4 . . . . -168.96(9) no
    C3 C4 C7 O3 . . . . 73.43(11) no
    C5 C4 C7 O3 . . . . -166.51(9) no
    C6 C4 C7 O3 . . . . -47.12(12) no
    C3 C4 C7 O4 . . . . -168.62(9) no
    C5 C4 C7 O4 . . . . -48.56(12) no
    C6 C4 C7 O4 . . . . 70.83(11) no
    C3 C4 C7 C8 . . . . -47.28(12) no
    C5 C4 C7 C8 . . . . 72.78(12) no
    C6 C4 C7 C8 . . . . -167.83(10) no
    O3 C7 C8 C9 . . . . -54.53(13) no
    O4 C7 C8 C9 . . . . -178.51(9) no
    C4 C7 C8 C9 . . . . 63.19(12) no
    C7 C8 C9 C10 . . . . -44.76(14) no
    C2 C3 C10 C9 . . . . -178.22(11) no
    C4 C3 C10 C9 . . . . -0.52(19) no
    C2 C3 C10 C11 . . . . 1.60(18) no
    C4 C3 C10 C11 . . . . 179.31(11) no
    C8 C9 C10 C3 . . . . 14.17(17) no
    C8 C9 C10 C11 . . . . -165.66(11) no
    C7 O3 C12 C13 . . . . -57.12(13) no
    O3 C12 C13 C16 . . . . 53.54(14) no
    O3 C12 C13 C14 . . . . -65.82(13) no
    O3 C12 C13 C15 . . . . 171.93(11) no
    C7 O4 C16 C13 . . . . 55.20(13) no
    C14 C13 C16 O4 . . . . 67.01(13) no
    C12 C13 C16 O4 . . . . -52.76(13) no
    C15 C13 C16 O4 . . . . -171.58(10) no
data_global
_journal_date_recd_electronic     2005-04-07
_journal_date_accepted     2005-04-25
_journal_name_full     'Acta Crystallographica, Section E'
_journal_year     2005
_journal_volume     61
_journal_issue      6
_journal_page_first     o1627
_journal_page_last     o1628
_journal_paper_category     EO
_publ_contact_author
;
Raija Oilunkaniemi
Department of Chemistry
PO Box 3000
FIN-90014 University of Oulu
Finland
;
_publ_contact_author_email     raija.oilunkaniemi@oulu.fi
_publ_contact_author_fax     '358 8 5531608'
_publ_contact_author_phone     '358 8 5531686'
_publ_section_title
;
Methyl 3,3,7,7,9-pentamethyl-1,5-dioxaspiro[5.5]undec-8-ene-8-carboxylate
;
loop_
    _publ_author_name
    _publ_author_address
    'Koskinen, Ari M. P.'
;
Laboratory of Organic Chemistry
Helsinki University of Technology
PO Box 6100
FIN-02015 HUT
Finland
;
    'Laitinen, Risto S.'
;
Department of Chemistry
PO Box 3000
FIN-90014 University of Oulu
Finland
;
    'Oilunkaniemi, Raija'
;
Department of Chemistry
PO Box 3000
FIN-90014 University of Oulu
Finland
;
    'Savilampi, Satu K.'
;
Laboratory of Organic Chemistry
Helsinki University of Technology
PO Box 6100
FIN-02015 HUT
Finland
;
    'Toivola, Reijo J.'
;
Department of Chemistry
PO Box 3000
FIN-90014 University of Oulu
Finland
;
