Design and synthesis of donor-acceptor Stenhouse adducts: a visible light photoswitch derived from furfural.
Helmy, Sameh; Oh, Saemi; Leibfarth, Frank A.; Hawker, Craig J.; Read de Alaniz, Javier; The Journal of organic chemistry 79 (2014) 11316–11329; doi:10.1021/jo502206g

data_4030159
_publ_section_title
;
 Design and synthesis of donor-acceptor Stenhouse adducts: a visible light
 photoswitch derived from furfural.
;
_journal_issue                   23
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              11316
_journal_page_last               11329
_journal_paper_doi               10.1021/jo502206g
_journal_volume                  79
_journal_year                    2014
_chemical_formula_sum            'C25 H25 N O5'
_chemical_formula_weight         419.46
_space_group_IT_number           9
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C -2yc'
_symmetry_space_group_name_H-M   'C 1 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                 94.873(9)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   23.220(7)
_cell_length_b                   6.4634(18)
_cell_length_c                   14.462(4)
_cell_measurement_temperature    100(2)
_cell_volume                     2162.6(11)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'Bruker Kappa APEX II'
_diffrn_measurement_method       'Omega scan'
_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  0.0434
_diffrn_reflns_av_sigmaI/netI    0.0743
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -27
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            4105
_diffrn_reflns_theta_full        24.71
_diffrn_reflns_theta_max         24.71
_diffrn_reflns_theta_min         1.76
_exptl_absorpt_coefficient_mu    0.090
_exptl_absorpt_correction_T_max  0.745
_exptl_absorpt_correction_T_min  0.464
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            pink
_exptl_crystal_density_diffrn    1.288
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             888
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.533
_refine_diff_density_min         -0.370
_refine_diff_density_rms         0.093
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.6(17)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.722
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     282
_refine_ls_number_reflns         2997
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.722
_refine_ls_R_factor_all          0.0715
_refine_ls_R_factor_gt           0.0634
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1398
_refine_ls_wR_factor_ref         0.1429
_reflns_number_gt                2650
_reflns_number_total             2997
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            31.cif
_cod_data_source_block           samdibenzyl_0m
_cod_depositor_comments
'Adding full bibliography for 4030156--4030166.cif.'
_cod_original_cell_volume        2162.7(11)
_cod_original_sg_symbol_H-M      Cc
_cod_database_code               4030159