Benzotrifuranone: synthesis, structure, and access to polycyclic heteroaromatics.
Li, Yan; Lampkins, Andrew J.; Baker, Matthew B.; Sumpter, Bobby G.; Huang, Jingsong; Abboud, Khalil A.; Castellano, Ronald K.; Organic letters 11 (2009) 4314–4317; doi:10.1021/ol901631n

data_1504131
_publ_section_title
;
 Benzotrifuranone: synthesis, structure, and access to polycyclic
 heteroaromatics.
;
_journal_issue                   19
_journal_name_full               'Organic letters'
_journal_page_first              4314
_journal_page_last               4317
_journal_paper_doi               10.1021/ol901631n
_journal_volume                  11
_journal_year                    2009
_chemical_formula_sum            'C12 H6 O6'
_chemical_formula_weight         246.17
_space_group_IT_number           41
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'A 2 -2ab'
_symmetry_space_group_name_H-M   'A b a 2'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
; 
2009-01-26 # Formatted by publCIF 
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            16
_cell_length_a                   10.4174(9)
_cell_length_b                   37.939(4)
_cell_length_c                   10.2770(9)
_cell_measurement_reflns_used    68
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      28
_cell_measurement_theta_min      2
_cell_volume                     4061.7(7)
_computing_cell_refinement
'Bruker SMART v5.624 & SAINT 6.36a (Bruker 1998)'
_computing_data_collection       'Bruker SMART v5.624 (Bruker 1998)'
_computing_data_reduction        'Bruker SHELXTL v6.14 (Bruker 2000)'
_computing_molecular_graphics    'Bruker SHELXTL v6.14'
_computing_publication_material  'Bruker SHELXTL v6.14'
_computing_structure_refinement  'Bruker SHELXTL v6.14'
_computing_structure_solution    'Bruker SHELXTL v6.14'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'SMART CCD area detector'
_diffrn_measurement_method       '\w 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  0.0465
_diffrn_reflns_av_sigmaI/netI    0.0576
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       49
_diffrn_reflns_limit_k_min       -46
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            12523
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         2.15
_diffrn_standards_decay_%        '< 1'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.133
_exptl_absorpt_correction_T_max  0.9934
_exptl_absorpt_correction_T_min  0.9749
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details
'based on measured indexed crystal faces, Bruker SHELXTL  v6.12 (Bruker 1998)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.610
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needles
_exptl_crystal_F_000             2016
_exptl_crystal_size_max          0.34
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.247
_refine_diff_density_min         -0.231
_refine_diff_density_rms         0.050
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.2(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     325
_refine_ls_number_reflns         4602
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.029
_refine_ls_R_factor_all          0.0511
_refine_ls_R_factor_gt           0.0439
_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^)+(0.0482P)^2^+1.0736P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1007
_refine_ls_wR_factor_ref         0.1042
_reflns_number_gt                4097
_reflns_number_total             4602
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ol901631n_si_002.cif
_cod_data_source_block           yl12
_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_cell_volume        4061.7(6)
_cod_original_sg_symbol_H-M      Aba2
_cod_database_code               1504131