An isolable o-quinodimethane and its fixation of molecular oxygen to give an endoperoxide.
Ghereg, Dumitru; Ech-Cherif El Kettani, Sakina; Lazraq, Mohamed; Ranaivonjatovo, Henri; Schoeller, Wolfgang W; Escudié, Jean; Gornitzka, Heinz; Chemical communications (Cambridge, England) 34 (2009) 4821–4823; doi:10.1039/b910001f

data_7104672
_publ_section_title
;
 An isolable o-quinodimethane and its fixation of molecular oxygen to
 give an endoperoxide.
;
_journal_issue                   32
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              4821
_journal_page_last               4823
_journal_paper_doi               10.1039/b910001f
_journal_volume                  34
_journal_year                    2009
_chemical_formula_sum            'C74 H71 Ge2 O2.5'
_chemical_formula_weight         1145.49
_chemical_name_systematic
;
?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 95.893(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.5043(9)
_cell_length_b                   21.2079(19)
_cell_length_c                   26.522(2)
_cell_measurement_reflns_used    3077
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      20.748
_cell_measurement_theta_min      2.173
_cell_volume                     5877.2(9)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'Bruker SHELXTL'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  'Bruker CCD'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0000
_diffrn_reflns_av_sigmaI/netI    0.1873
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       29
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            8361
_diffrn_reflns_theta_full        23.26
_diffrn_reflns_theta_max         23.26
_diffrn_reflns_theta_min         5.10
_exptl_absorpt_coefficient_mu    1.071
_exptl_absorpt_correction_T_max  1.000000
_exptl_absorpt_correction_T_min  0.572649
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker-AXS)'
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.295
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             2396
_exptl_crystal_size_max          0.5
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.1
_refine_diff_density_max         1.678
_refine_diff_density_min         -0.749
_refine_diff_density_rms         0.112
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.019
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     742
_refine_ls_number_reflns         8361
_refine_ls_number_restraints     142
_refine_ls_restrained_S_all      1.014
_refine_ls_R_factor_all          0.1720
_refine_ls_R_factor_gt           0.0868
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0860P)^2^+5.6393P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1668
_refine_ls_wR_factor_ref         0.1976
_reflns_number_gt                4646
_reflns_number_total             8361
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b910001f.txt
_cod_data_source_block           2
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_exptl_absorpt_correction_type' tag value 'multi-scans' was replaced
with 'multi-scan' value.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 
;
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_original_formula_sum        'C74 H71 Ge2 O2.50'
_cod_database_code               7104672