2,8- and 2,9-Diboryltetracenes as useful building blocks for extended pi-conjugated tetracenes.
Kimoto, Takakazu; Tanaka, Kenro; Sakai, Yoshimasa; Ohno, Akira; Yoza, Kenji; Kobayashi, Kenji; Organic letters 11 (2009) 3658–3661; doi:10.1021/ol901420p

data_1504077
_publ_section_title
;
 2,8- and 2,9-Diboryltetracenes as useful building blocks for extended
 pi-conjugated tetracenes.
;
_journal_issue                   16
_journal_name_full               'Organic letters'
_journal_page_first              3658
_journal_page_last               3661
_journal_paper_doi               10.1021/ol901420p
_journal_volume                  11
_journal_year                    2009
_chemical_formula_sum            'C30 H34 B2 O4'
_chemical_formula_weight         480.19
_space_group_IT_number           43
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'F 2 -2d'
_symmetry_space_group_name_H-M   'F d d 2'
_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            16
_cell_length_a                   36.848(9)
_cell_length_b                   45.584(11)
_cell_length_c                   6.2397(15)
_cell_measurement_reflns_used    3032
_cell_measurement_temperature    93
_cell_measurement_theta_max      27.15
_cell_measurement_theta_min      2.21
_cell_volume                     10481(4)
_computing_cell_refinement       'APEX2 (Bruker AXS, 2006)'
_computing_data_collection       'APEX2 (Bruker AXS, 2006)'
_computing_data_reduction        'SAINT (Bruker AXS, 2004)'
_computing_molecular_graphics    'XSHEL (Bruker AXS,2002)'
_computing_publication_material  'XCIF (Bruker AXS, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      93
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker APEXII CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  'Bruker Helios multilayer confocal mirror'
_diffrn_radiation_source         'Bruker TXS fine-focus rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0453
_diffrn_reflns_av_sigmaI/netI    0.0686
_diffrn_reflns_limit_h_max       47
_diffrn_reflns_limit_h_min       -35
_diffrn_reflns_limit_k_max       58
_diffrn_reflns_limit_k_min       -45
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            14761
_diffrn_reflns_theta_full        27.52
_diffrn_reflns_theta_max         27.52
_diffrn_reflns_theta_min         1.42
_exptl_absorpt_coefficient_mu    0.078
_exptl_absorpt_correction_T_max  0.9977
_exptl_absorpt_correction_T_min  0.9861
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details
;
SADABS Sheldrick 1996
;
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.217
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       column
_exptl_crystal_F_000             4096
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.223
_refine_diff_density_min         -0.176
_refine_diff_density_rms         0.044
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.7(11)
_refine_ls_extinction_coef       0.00040(5)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.019
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     408
_refine_ls_number_reflns         5853
_refine_ls_number_restraints     619
_refine_ls_restrained_S_all      0.989
_refine_ls_R_factor_all          0.0862
_refine_ls_R_factor_gt           0.0454
_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^)+(0.0523P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0944
_refine_ls_wR_factor_ref         0.1094
_reflns_number_gt                4042
_reflns_number_total             5853
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol901420p_si_002.cif
_cod_data_source_block           2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'Fdd2 '
_cod_database_code               1504077