Synthesis of semibullvalene derivatives via Co2(CO)8-mediated cyclodimerization of 1,4-dilithio-1,3-butadienes
Zhang, Shaoguang; Zhan, Ming; Wang, Qifeng; Wang, Chao; Zhang, Wen-Xiong; Xi, Zhenfeng; Org. Chem. Front. 1 (2014) 130–; doi:10.1039/C3QO00019B

data_1556391
_publ_section_title
;
 Synthesis of semibullvalene derivatives via Co2(CO)8-mediated
 cyclodimerization of 1,4-dilithio-1,3-butadienes
;
_journal_issue                   2
_journal_name_full               'Org. Chem. Front.'
_journal_page_first              130
_journal_paper_doi               10.1039/C3QO00019B
_journal_volume                  1
_journal_year                    2014
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C18 H20 O2'
_chemical_formula_sum            'C18 H20 O2'
_chemical_formula_weight         268.34
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.1769(18)
_cell_length_b                   10.289(2)
_cell_length_c                   14.620(3)
_cell_measurement_reflns_used    3122
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.4836
_cell_measurement_theta_min      1.3929
_cell_volume                     1380.4(5)
_computing_cell_refinement       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_collection       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_reduction        'CrystalClear (Rigaku Inc., 2008)'
_computing_molecular_graphics
;
 Mercury: visualization and analysis of crystal structures, C. F. Macrae,
 P. R. Edgington, P. McCabe, E. Pidcock, G. P. Shields, R. Taylor,
 M. Towler and J. van de Streek, J. Appl. Cryst., 39, 453-457, 2006.
;
_computing_publication_material  'SHELX-97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELX-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELX-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 28.5714
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Saturn724+ CCD'
_diffrn_measurement_method       '\w scans at fixed \c = 45\%'
_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  0.0279
_diffrn_reflns_av_sigmaI/netI    0.0191
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            7672
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         3.28
_exptl_absorpt_coefficient_mu    0.082
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.7441
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrystalClear (Rigaku Inc., 2008)'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.291
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             576
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.34
_exptl_crystal_size_min          0.32
_refine_diff_density_max         0.159
_refine_diff_density_min         -0.106
_refine_diff_density_rms         0.029
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.168
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     200
_refine_ls_number_reflns         1814
_refine_ls_number_restraints     66
_refine_ls_restrained_S_all      1.199
_refine_ls_R_factor_all          0.0534
_refine_ls_R_factor_gt           0.0499
_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^)+(0.0498P)^2^+0.2573P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1210
_refine_ls_wR_factor_ref         0.1232
_reflns_number_gt                1738
_reflns_number_total             1814
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3qo00019b.txt
_cod_data_source_block           a
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1556391