A stable germanone as the first isolated heavy ketone with a terminal oxygen atom.
Li, Liangchun; Fukawa, Tomohide; Matsuo, Tsukasa; Hashizume, Daisuke; Fueno, Hiroyuki; Tanaka, Kazuyoshi; Tamao, Kohei; Nature chemistry 4 (2012) 361–365; doi:10.1038/nchem.1305

data_1508193
_publ_section_title
;
 A stable germanone as the first isolated heavy ketone with a terminal
 oxygen atom.
;
_journal_issue                   5
_journal_name_full               'Nature chemistry'
_journal_page_first              361
_journal_page_last               365
_journal_paper_doi               10.1038/nchem.1305
_journal_volume                  4
_journal_year                    2012
_chemical_formula_moiety         'C56 H92 Ge O2'
_chemical_formula_sum            'C56 H92 Ge O2'
_chemical_formula_weight         869.89
_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   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90
_cell_angle_beta                 102.1510(12)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   13.0454(13)
_cell_length_b                   18.9843(19)
_cell_length_c                   20.817(2)
_cell_measurement_reflns_used    17163
_cell_measurement_temperature    173
_cell_measurement_theta_max      29.1270
_cell_measurement_theta_min      2.8115
_cell_volume                     5040.0(9)
_computing_cell_refinement       CrystalClear
_computing_data_collection       CrystalClear
_computing_data_reduction        CrystalClear
_computing_molecular_graphics    'ORTEP-3 for Windows'
_computing_publication_material  SHELXL-97
_computing_structure_refinement  SHELXL-97
_computing_structure_solution    SIR-97
_diffrn_ambient_temperature      173
_diffrn_detector_area_resol_mean 7.31
_diffrn_measured_fraction_theta_full 0.986
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device_type  'Rigaku AFC-10 with Saturn724+ CCD'
_diffrn_measurement_method       \w-scan
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0244
_diffrn_reflns_av_sigmaI/netI    0.0260
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            40891
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.27
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.647
_exptl_absorpt_correction_T_max  0.8297
_exptl_absorpt_correction_T_min  0.7438
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 REQAB implemented in CrystalClear
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.146
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1904
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.496
_refine_diff_density_min         -0.271
_refine_diff_density_rms         0.045
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.035
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     572
_refine_ls_number_reflns         11418
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.035
_refine_ls_R_factor_all          0.0349
_refine_ls_R_factor_gt           0.0313
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0386P)^2^+1.9422P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0768
_refine_ls_wR_factor_ref         0.0792
_reflns_number_gt                10436
_reflns_number_total             11418
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            nchem.1305-s6.cif
_cod_data_source_block           Eind2GeO-H2O
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               1508193