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_4030166
_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            'C15 H21 N3 O4'
_chemical_formula_weight         307.35
_space_group_IT_number           33
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   19.694(10)
_cell_length_b                   13.615(6)
_cell_length_c                   5.587(3)
_cell_measurement_temperature    100(2)
_cell_volume                     1498.1(13)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_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  0.0633
_diffrn_reflns_av_sigmaI/netI    0.0836
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       2
_diffrn_reflns_limit_l_min       -6
_diffrn_reflns_number            3999
_diffrn_reflns_theta_full        26.37
_diffrn_reflns_theta_max         26.37
_diffrn_reflns_theta_min         1.82
_exptl_absorpt_coefficient_mu    0.100
_exptl_absorpt_correction_T_max  0.9990
_exptl_absorpt_correction_T_min  0.9852
_exptl_crystal_density_diffrn    1.363
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             656
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.02
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.502
_refine_diff_density_min         -0.536
_refine_diff_density_rms         0.131
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -2(3)
_refine_ls_extinction_coef       0.016(5)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.600
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     180
_refine_ls_number_reflns         2031
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.599
_refine_ls_R_factor_all          0.1153
_refine_ls_R_factor_gt           0.0845
_refine_ls_shift/su_max          0.025
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0600P)^2^+0.0499P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1866
_refine_ls_wR_factor_ref         0.1958
_reflns_number_gt                1494
_reflns_number_total             2031
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            34.cif
_cod_data_source_block           dedmbsten_1_0m
_cod_depositor_comments
'Adding full bibliography for 4030156--4030166.cif.'
_cod_original_cell_volume        1498.1(12)
_cod_database_code               4030166