A versatile preparation of Geländer-type p-terphenyls from a readily available diacetylenic precursor.
Modjewski, Matthew; Lindeman, Sergey V.; Rathore, Rajendra; Organic letters 11 (2009) 4656–4659; doi:10.1021/ol901938f

data_1504209
_publ_section_title
;
 A versatile preparation of Gel\"ander-type p-terphenyls from a readily
 available diacetylenic precursor.
;
_journal_issue                   20
_journal_name_full               'Organic letters'
_journal_page_first              4656
_journal_page_last               4659
_journal_paper_doi               10.1021/ol901938f
_journal_volume                  11
_journal_year                    2009
_chemical_formula_sum            'C40 H50 Cl4 O4'
_chemical_formula_weight         736.60
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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                 106.3470(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   12.5705(2)
_cell_length_b                   9.62430(10)
_cell_length_c                   15.9960(2)
_cell_measurement_reflns_used    9920
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      67
_cell_measurement_theta_min      4
_cell_volume                     1857.00(4)
_computing_cell_refinement       'SAINT v7.56A (Bruker, 2008)'
_computing_data_collection       'APEX2-2008.5-0 (Bruker, 2008)'
_computing_data_reduction        'SADABS-2008/1 (Bruker, 2008)'
_computing_molecular_graphics    'XP v5.1 (Bruker, 1998)'
_computing_publication_material  'XCIF-2008/2 (Bruker, 2008)'
_computing_structure_refinement  'SHELXL-2008/4(Bruker, 2008)'
_computing_structure_solution    'XS/SHELXTL-2008/1 (Bruker, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.980
_diffrn_measured_fraction_theta_max 0.980
_diffrn_measurement_device_type  'Bruker APEX2 CCD detector'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0193
_diffrn_reflns_av_sigmaI/netI    0.0127
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            15545
_diffrn_reflns_theta_full        68.05
_diffrn_reflns_theta_max         68.05
_diffrn_reflns_theta_min         3.66
_exptl_absorpt_coefficient_mu    3.210
_exptl_absorpt_correction_T_max  0.7396
_exptl_absorpt_correction_T_min  0.6277
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 SADABS. Program for empirical absorption correction of
 area-detector data. University of Goetingen. Germany. 
 Sheldrick, G. M. 1996
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.317
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             780
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.299
_refine_diff_density_min         -0.198
_refine_diff_density_rms         0.042
_refine_ls_extinction_coef       0.00094(16)
_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   1.015
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     220
_refine_ls_number_reflns         3314
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.015
_refine_ls_R_factor_all          0.0312
_refine_ls_R_factor_gt           0.0304
_refine_ls_shift/su_max          0.002
_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^+0.8573P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0815
_refine_ls_wR_factor_ref         0.0821
_reflns_number_gt                3190
_reflns_number_total             3314
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol901938f_si_009.cif
_cod_data_source_block           raj14q
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               1504209