NHC–gold(i) catalysed [4 + 2] cycloaddition–acyclic addition of dialkyl substituted propargylic esters with 1,3-diphenylisobenzofuran: synthesis of novel benzo[c]fluorenols and substituted dienes
Kotikalapudi, Ramesh; Siva Kumari, A. Leela; Swamy, K. C. Kumara; RSC Adv. 4 (2014) 17717–; doi:10.1039/C4RA01105H

data_7235527
_publ_section_title
;
 NHC--gold(i) catalysed [4 + 2] cycloaddition--acyclic addition of dialkyl
 substituted propargylic esters with 1,3-diphenylisobenzofuran: synthesis
 of novel benzo[c]fluorenols and substituted dienes
;
_journal_issue                   34
_journal_name_full               'RSC Adv.'
_journal_page_first              17717
_journal_paper_doi               10.1039/C4RA01105H
_journal_volume                  4
_journal_year                    2014
_chemical_formula_sum            'C37 H28 O4'
_chemical_formula_weight         536.59
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_cell_setting           monoclinic
_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                 91.002(16)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.5694(14)
_cell_length_b                   16.183(4)
_cell_length_c                   16.088(4)
_cell_measurement_reflns_used    1307
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      24.8640
_cell_measurement_theta_min      3.4040
_cell_volume                     2751.3(10)
_computing_cell_refinement       'CrysAlisPro, Oxford Diffraction Ltd.'
_computing_data_collection       'CrysAlisPro, Oxford Diffraction Ltd.'
_computing_data_reduction        'CrysAlisPro, Oxford Diffraction Ltd.'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.8934
_diffrn_measured_fraction_theta_max 0.913
_diffrn_measurement_device_type  'Xcalibur, Eos, Gemini'
_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  0.0341
_diffrn_reflns_av_sigmaI/netI    0.0767
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            7007
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         28.9800
_diffrn_reflns_theta_min         2.8179
_diffrn_standards_decay_%        none
_diffrn_standards_interval_count 'not applicable'
_diffrn_standards_interval_time  'not applicable'
_diffrn_standards_number         'not applicable'
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.93687
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrysAlisPro, Oxford Diffraction Ltd.'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.296
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1128
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.126
_refine_diff_density_min         -0.130
_refine_diff_density_rms         0.031
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.931
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     371
_refine_ls_number_reflns         4417
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.931
_refine_ls_R_factor_all          0.1085
_refine_ls_R_factor_gt           0.0508
_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^)+(0.0206P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0748
_refine_ls_wR_factor_ref         0.0920
_reflns_number_gt                2462
_reflns_number_total             4417
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4ra01105h2.cif
_cod_data_source_block           compd_4l
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7235527