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_1508190
_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 H90 Ge O'
_chemical_formula_sum            'C56 H90 Ge O'
_chemical_formula_weight         851.87
_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                 90.2057(4)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   25.3767(2)
_cell_length_b                   10.98230(10)
_cell_length_c                   18.0763(2)
_cell_measurement_reflns_used    211606
_cell_measurement_temperature    90
_cell_measurement_theta_max      41.00
_cell_measurement_theta_min      1.13
_cell_volume                     5037.73(8)
_computing_cell_refinement       HKL2000
_computing_data_collection       CrystalClear
_computing_data_reduction        HKL2000
_computing_molecular_graphics    'ORTEP-3 for Windows'
_computing_publication_material  SHELXL-97
_computing_structure_refinement  SHELXL-97
_computing_structure_solution    SIR2004
_diffrn_ambient_temperature      90
_diffrn_detector_area_resol_mean 7.31
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.987
_diffrn_measurement_device_type  'Rigaku AFC-8 with Saturn70 CCD'
_diffrn_measurement_method       \w-scan
_diffrn_radiation_monochromator  cofocal
_diffrn_radiation_source         'fine-focus rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0441
_diffrn_reflns_av_sigmaI/netI    0.0383
_diffrn_reflns_limit_h_max       46
_diffrn_reflns_limit_h_min       -46
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       33
_diffrn_reflns_limit_l_min       -33
_diffrn_reflns_number            207295
_diffrn_reflns_theta_full        41.00
_diffrn_reflns_theta_max         41.00
_diffrn_reflns_theta_min         2.31
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.644
_exptl_absorpt_correction_T_max  0.87747
_exptl_absorpt_correction_T_min  0.87080
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 MULABS - Empirical Correction for Absorption Anisotropy.
 R.H. Blessing, Acta Crystallogr., Sect. A. 51, 33-38 (1995).
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.123
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1864
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.680
_refine_diff_density_min         -0.539
_refine_diff_density_rms         0.053
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.054
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     561
_refine_ls_number_reflns         32768
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.054
_refine_ls_R_factor_all          0.0525
_refine_ls_R_factor_gt           0.0328
_refine_ls_shift/su_max          0.006
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0484P)^2^+0.1276P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0902
_refine_ls_wR_factor_ref         0.0961
_reflns_number_gt                24325
_reflns_number_total             32768
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            nchem.1305-s3.cif
_cod_data_source_block           GeO
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               1508190