Triptycenediols by rhodium-catalyzed [2+2+2] cycloaddition.
Taylor, Mark S.; Swager, Timothy M.; Organic letters 9 (2007) 3695–3697; doi:10.1021/ol701642j

data_1505529
_publ_section_title
;
 Triptycenediols by rhodium-catalyzed [2+2+2] cycloaddition.
;
_journal_issue                   18
_journal_name_full               'Organic letters'
_journal_page_first              3695
_journal_page_last               3697
_journal_paper_doi               10.1021/ol701642j
_journal_volume                  9
_journal_year                    2007
_chemical_formula_sum            'C20 H16 O2'
_chemical_formula_weight         288.33
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_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                 124.003(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   19.365(4)
_cell_length_b                   11.660(2)
_cell_length_c                   15.931(3)
_cell_measurement_reflns_used    6509
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      30.58
_cell_measurement_theta_min      2.20
_cell_volume                     2982.1(10)
_computing_cell_refinement       'SAINT 5 (Bruker-AXS, 2003)'
_computing_data_collection       'SMART 5 (Bruker-AXS, 2003)'
_computing_data_reduction        'SAINT 5 (Bruker-AXS, 2003)'
_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_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker Smart APEX CCD'
_diffrn_measurement_method       'omega and phi 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  0.0437
_diffrn_reflns_av_sigmaI/netI    0.0274
_diffrn_reflns_limit_h_max       26
_diffrn_reflns_limit_h_min       -26
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            32070
_diffrn_reflns_theta_full        29.57
_diffrn_reflns_theta_max         29.57
_diffrn_reflns_theta_min         2.16
_exptl_absorpt_coefficient_mu    0.082
_exptl_absorpt_correction_T_max  0.9919
_exptl_absorpt_correction_T_min  0.9798
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.284
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1216
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.557
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_refine_ls_extinction_method     none
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_refine_ls_number_parameters     201
_refine_ls_number_reflns         4189
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.026
_refine_ls_R_factor_all          0.0651
_refine_ls_R_factor_gt           0.0484
_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^)+(0.0755P)^2^+1.6406P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1217
_refine_ls_wR_factor_ref         0.1335
_reflns_number_gt                3242
_reflns_number_total             4189
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol701642j-file004.cif
_cod_data_source_block           swager6b
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_cell_volume        2982.2(10)
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               1505529