Intramolecular reductive double cyclization of o,o'-bis(arylcarbonyl)diphenylacetylenes: synthesis of ladder pi-conjugated skeletons.
Zhang, Hongyu; Karasawa, Takashi; Yamada, Hiroshi; Wakamiya, Atsushi; Yamaguchi, Shigehiro; Organic letters 11 (2009) 3076–3079; doi:10.1021/ol901148p

data_1504017
_publ_section_title
;
 Intramolecular reductive double cyclization of
 o,o'-bis(arylcarbonyl)diphenylacetylenes: synthesis of ladder
 pi-conjugated skeletons.
;
_journal_issue                   14
_journal_name_full               'Organic letters'
_journal_page_first              3076
_journal_page_last               3079
_journal_paper_doi               10.1021/ol901148p
_journal_volume                  11
_journal_year                    2009
_chemical_formula_sum            'C28 H20 O2'
_chemical_formula_weight         388.44
_chemical_melting_point          519
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.0000(10)
_cell_angle_beta                 95.4352(10)
_cell_angle_gamma                90.0000(10)
_cell_formula_units_Z            2
_cell_length_a                   8.940(2)
_cell_length_b                   10.890(3)
_cell_length_c                   10.079(3)
_cell_measurement_reflns_used    3528
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      31.5050
_cell_measurement_theta_min      2.7599
_cell_volume                     976.8(5)
_computing_molecular_graphics    'ORTEP 3 for windows'
_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
;
Saturn70 CCD (4x4 bin mode) with MicroMax-007
;
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71070
_diffrn_reflns_av_R_equivalents  0.0270
_diffrn_reflns_av_sigmaI/netI    0.0435
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            6580
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.76
_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   'Jacobson, R. (1998) Private communication'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.321
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             408
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.136
_refine_diff_density_min         -0.204
_refine_diff_density_rms         0.042
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.00
_refine_ls_extinction_coef       none
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.022
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     331
_refine_ls_number_reflns         3428
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.022
_refine_ls_R_factor_all          0.0407
_refine_ls_R_factor_gt           0.0359
_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^)+(0.0461P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0779
_refine_ls_wR_factor_ref         0.0804
_reflns_number_gt                3059
_reflns_number_total             3428
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol901148p_si_002.cif
_cod_data_source_block           cis2b
_cod_original_sg_symbol_H-M      P21
_cod_database_code               1504017