Solvent-Controlled Intramolecular [2 + 2] Photocycloadditions of α-Substituted Enones
Stephanie M. Ng; Scott J. Bader; Marc L. Snapper; Journal of the American Chemical Society 128 (2006) 7315–7319; doi:10.1021/ja060968g

data_4110635
_publ_section_title
;
 Solvent-Controlled Intramolecular [2 + 2] Photocycloadditions of
 \a-Substituted Enones
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              7315
_journal_page_last               7319
_journal_paper_doi               10.1021/ja060968g
_journal_volume                  128
_journal_year                    2006
_chemical_formula_moiety         'C19 H19 Br O3'
_chemical_formula_sum            'C19 H19 Br O3'
_chemical_formula_weight         375.25
_space_group_IT_number           1
_symmetry_cell_setting           triclinic
_symmetry_Int_Tables_number      1
_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_creation_method           SHELXL-97
_cell_angle_alpha                88.000(3)
_cell_angle_beta                 77.060(2)
_cell_angle_gamma                76.470(3)
_cell_formula_units_Z            4
_cell_length_a                   7.6996(13)
_cell_length_b                   14.279(3)
_cell_length_c                   15.933(3)
_cell_measurement_reflns_used    4635
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      25.77
_cell_measurement_theta_min      2.62
_cell_volume                     1659.6(5)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      193(2)
_diffrn_measured_fraction_theta_full 0.986
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0182
_diffrn_reflns_av_sigmaI/netI    0.0690
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            12412
_diffrn_reflns_theta_full        28.43
_diffrn_reflns_theta_max         28.43
_diffrn_reflns_theta_min         1.31
_diffrn_source                   'normal-focus sealed tube'
_exptl_absorpt_coefficient_mu    2.489
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.4061
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.502
_exptl_crystal_description       chunk
_exptl_crystal_F_000             768
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.16
_refine_diff_density_max         1.044
_refine_diff_density_min         -0.415
_refine_diff_density_rms         0.083
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.012(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.964
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     829
_refine_ls_number_reflns         9906
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      0.964
_refine_ls_R_factor_all          0.0500
_refine_ls_R_factor_gt           0.0394
_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^)+(0.0328P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0873
_refine_ls_wR_factor_ref         0.0912
_reflns_number_gt                8121
_reflns_number_total             9906
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja060968gsi20060412_015442.cif
_cod_data_source_block           sn09t1
_cod_database_code               4110635