Synthesis of sterically hindered ortho-substituted tetraphenylethenes. Electronic effects in the McMurry olefination reaction.
Chung, Mee-Kyung; Qi, Guizhong; Stryker, Jeffrey M.; Organic letters 8 (2006) 1491–1494; doi:10.1021/ol060318h

data_1505923
_publ_section_title
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 Synthesis of sterically hindered ortho-substituted tetraphenylethenes.
 Electronic effects in the McMurry olefination reaction.
;
_journal_issue                   7
_journal_name_full               'Organic letters'
_journal_page_first              1491
_journal_page_last               1494
_journal_paper_doi               10.1021/ol060318h
_journal_volume                  8
_journal_year                    2006
_chemical_formula_moiety         'C28 H24 O2'
_chemical_formula_sum            'C28 H24 O2'
_chemical_formula_weight         392.47
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           'manual editing of SHELXL template'
_cell_angle_alpha                90.00
_cell_angle_beta                 97.1230(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.0083(4)
_cell_length_b                   19.6711(14)
_cell_length_c                   18.7067(13)
_cell_measurement_reflns_used    7546
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      26.33
_cell_measurement_theta_min      2.34
_cell_volume                     2193.9(3)
_computing_cell_refinement       'Bruker SAINT (Bruker, 1997)'
_computing_data_collection       'Bruker SMART (Bruker, 1997)'
_computing_data_reduction        'Bruker SAINT (Bruker, 1997)'
_computing_molecular_graphics    'Bruker SHELXTL (Bruker, 1997)'
_computing_publication_material  'Bruker SHELXTL (Bruker, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      193(2)
_diffrn_detector_area_resol_mean 8.192
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type
'Bruker PLATFORM diffractometer/SMART 1000 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  0.0250
_diffrn_reflns_av_sigmaI/netI    0.0217
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            16002
_diffrn_reflns_theta_full        26.40
_diffrn_reflns_theta_max         26.40
_diffrn_reflns_theta_min         1.51
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.073
_exptl_absorpt_correction_T_max  0.9905
_exptl_absorpt_correction_T_min  0.9608
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1996)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.188
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             832
_exptl_crystal_size_max          0.55
_exptl_crystal_size_mid          0.39
_exptl_crystal_size_min          0.13
_refine_diff_density_max         0.185
_refine_diff_density_min         -0.148
_refine_diff_density_rms         0.031
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.016
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     273
_refine_ls_number_reflns         4501
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.016
_refine_ls_R_factor_all          0.0503
_refine_ls_R_factor_gt           0.0371
_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^)+(0.0462P)^2^+0.4809P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0940
_refine_ls_wR_factor_ref         0.1035
_reflns_number_gt                3568
_reflns_number_total             4501
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ol060318hsi20060217_050054.cif
_cod_data_source_block           Z-2h
_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 
;
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               1505923