6Pi e- versus 8pi e- electrocyclization of 1-aryl- and heteroaryl-substituted (1Z,3Z)-1,3,5-hexatrienes: a matter of aromaticity.
García-Rubín, Silvia; Varela, Jesús A; Castedo, Luis; Saá, Carlos; Organic letters 11 (2009) 983–986; doi:10.1021/ol802925q

data_1503796
_publ_section_title
;
 6Pi e- versus 8pi e- electrocyclization of 1-aryl- and
 heteroaryl-substituted (1Z,3Z)-1,3,5-hexatrienes: a matter of
 aromaticity.
;
_journal_issue                   4
_journal_name_full               'Organic letters'
_journal_page_first              983
_journal_page_last               986
_journal_paper_doi               10.1021/ol802925q
_journal_volume                  11
_journal_year                    2009
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C22 H22 O5'
_chemical_formula_sum            'C22 H22 O5'
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_symmetry_cell_setting           triclinic
_symmetry_Int_Tables_number      2
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.3
_audit_creation_date             2007-07-05T10:49:14-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                97.369(3)
_cell_angle_beta                 93.452(3)
_cell_angle_gamma                93.910(3)
_cell_formula_units_Z            2
_cell_length_a                   7.6317(4)
_cell_length_b                   9.9884(6)
_cell_length_c                   12.0719(6)
_cell_measurement_reflns_used    1958
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.22
_cell_measurement_theta_min      2.5
_cell_measurement_wavelength     0.71073
_cell_volume                     908.28(9)
_computing_cell_refinement       'Bruker APEX II'
_computing_data_collection       'Bruker APEX II'
_computing_data_reduction        'Bruker APEX II'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR97 (Giacovazzo et al, 1997)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'BrukerAXS ApexII-CCD area detector '
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0245
_diffrn_reflns_av_unetI/netI     0.0168
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            22029
_diffrn_reflns_theta_full        28.29
_diffrn_reflns_theta_max         28.29
_diffrn_reflns_theta_min         1.7
_exptl_absorpt_coefficient_mu    0.095
_exptl_absorpt_correction_T_max  0.976
_exptl_absorpt_correction_T_min  0.956
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'BRUKER SADABS'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.34
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             388
_exptl_crystal_size_max          0.43
_exptl_crystal_size_mid          0.34
_exptl_crystal_size_min          0.26
_refine_diff_density_max         0.327
_refine_diff_density_min         -0.276
_refine_diff_density_rms         0.055
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.057
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     247
_refine_ls_number_reflns         4491
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.057
_refine_ls_R_factor_all          0.0426
_refine_ls_R_factor_gt           0.0387
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0489P)^2^+0.3608P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0976
_refine_ls_wR_factor_ref         0.0999
_reflns_number_gt                4068
_reflns_number_total             4491
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol802925q_si_004.cif
_cod_data_source_block           cs04su1n
_cod_database_code               1503796