Syntheses, X-ray crystal structures and reactivity of fluorenylidene- and dibenzosuberenylidene-allenes: convenient precursors to dispirotetracenes, di-indenotetracenes and 2-phenyl-11bH-dibenz[cd,h]azulene.
Banide, Emilie V.; O'Connor, Crystal; Fortune, Natasha; Ortin, Yannick; Milosevic, Sandra; Müller-Bunz, Helge; McGlinchey, Michael J.; Organic & biomolecular chemistry 8 (2010) 3997–4010; doi:10.1039/c004868b

data_7153400
_publ_section_title
;
 Syntheses, X-ray crystal structures and reactivity of fluorenylidene- and
 dibenzosuberenylidene-allenes: convenient precursors to
 dispirotetracenes, di-indenotetracenes and
 2-phenyl-11bH-dibenz[cd,h]azulene.
;
_journal_issue                   17
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              3997
_journal_page_last               4010
_journal_paper_doi               10.1039/c004868b
_journal_volume                  8
_journal_year                    2010
_chemical_formula_moiety         'C23 H16'
_chemical_formula_sum            'C23 H16'
_chemical_formula_weight         292.36
_space_group_IT_number           56
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ab 2ac'
_symmetry_space_group_name_H-M   'P c c n'
_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            8
_cell_length_a                   19.553(3)
_cell_length_b                   28.605(5)
_cell_length_c                   5.3564(9)
_cell_measurement_reflns_used    6106
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      23.26
_cell_measurement_theta_min      2.38
_cell_volume                     2995.9(9)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.366
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0431
_diffrn_reflns_av_sigmaI/netI    0.0269
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       31
_diffrn_reflns_limit_k_min       -31
_diffrn_reflns_limit_l_max       5
_diffrn_reflns_limit_l_min       -5
_diffrn_reflns_number            16917
_diffrn_reflns_theta_full        23.29
_diffrn_reflns_theta_max         23.29
_diffrn_reflns_theta_min         1.42
_exptl_absorpt_coefficient_mu    0.073
_exptl_absorpt_correction_T_max  0.9993
_exptl_absorpt_correction_T_min  0.8277
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS v.2.10 (Bruker,2003) was used for absorption correction.
R(int) for selected reflections was 0.153 before and 0.038 after
correction. The Ratio of minimum to maximum transmission is 0.828312.
The \l/2 correction factor is 0.0015
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.296
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       lath
_exptl_crystal_F_000             1232
_exptl_crystal_size_max          0.80
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.200
_refine_diff_density_min         -0.135
_refine_diff_density_rms         0.037
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.128
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     208
_refine_ls_number_reflns         2135
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.128
_refine_ls_R_factor_all          0.0505
_refine_ls_R_factor_gt           0.0418
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0384P)^2^+1.7376P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0956
_refine_ls_wR_factor_ref         0.0991
_reflns_number_gt                1846
_reflns_number_total             2135
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            c004868b.txt
_cod_data_source_block           mjm173(30)
_cod_database_code               7153400