Unexpected one-pot method to synthesize spiro[fluorene-9,9'-xanthene] building blocks for blue-light-emitting materials.
Xie, Ling-Hai; Liu, Feng; Tang, Chao; Hou, Xiao-Ya; Hua, Yu-Ran; Fan, Qu-Li; Huang, Wei; Organic letters 8 (2006) 2787–2790; doi:10.1021/ol060871z

data_1506025
_publ_section_title
;
 Unexpected one-pot method to synthesize spiro[fluorene-9,9'-xanthene]
 building blocks for blue-light-emitting materials.
;
_journal_issue                   13
_journal_name_full               'Organic letters'
_journal_page_first              2787
_journal_page_last               2790
_journal_paper_doi               10.1021/ol060871z
_journal_volume                  8
_journal_year                    2006
_chemical_formula_sum            'C25 H16 O'
_chemical_formula_weight         332.38
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_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                   10.699(2)
_cell_length_b                   16.752(3)
_cell_length_c                   9.5269(18)
_cell_measurement_reflns_used    4023
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      25.44
_cell_measurement_theta_min      2.26
_cell_volume                     1707.5(5)
_computing_cell_refinement       'Bruker SMART'
_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      293(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_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  0.0334
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_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -20
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_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            8370
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         2.26
_diffrn_standards_decay_%        9.58
_exptl_absorpt_coefficient_mu    0.077
_exptl_absorpt_correction_T_max  0.9847
_exptl_absorpt_correction_T_min  0.9772
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_density_diffrn    1.293
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             696
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.180
_refine_diff_density_min         -0.140
_refine_diff_density_rms         0.027
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.7(16)
_refine_ls_extinction_coef       0.019(2)
_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   1.061
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     236
_refine_ls_number_reflns         3344
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.061
_refine_ls_R_factor_all          0.0402
_refine_ls_R_factor_gt           0.0338
_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^)+(0.0381P)^2^+0.0929P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0882
_refine_ls_wR_factor_ref         0.0923
_reflns_number_gt                2921
_reflns_number_total             3344
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol060871zsi20060412_100338.cif
_cod_data_source_block           51124b
_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 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        1707.5(6)
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1506025