Low-temperature ketene formation in materials chemistry through molecular engineering
Leibfarth, Frank A.; Wolffs, Martin; Campos, Luis M.; Delany, Kris; Treat, Nicolas; Kade, Matthew J.; Moon, Bongjin; Hawker, Craig J.; Chemical Science 3 (2012) 766–; doi:10.1039/c2sc00841f

data_1515126
_publ_section_title
;
 Low-temperature ketene formation in materials chemistry through molecular
 engineering
;
_journal_issue                   3
_journal_name_full               'Chemical Science'
_journal_page_first              766
_journal_paper_doi               10.1039/c2sc00841f
_journal_volume                  3
_journal_year                    2012
_chemical_formula_sum            'C19 H21 N3 O4'
_chemical_formula_weight         355.39
_chemical_name_systematic
;
?
;
_space_group_IT_number           45
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'I 2 -2c'
_symmetry_space_group_name_H-M   'I b a 2'
_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            8
_cell_length_a                   17.443(4)
_cell_length_b                   21.703(5)
_cell_length_c                   9.844(2)
_cell_measurement_temperature    293(2)
_cell_volume                     3726.6(14)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.971
_diffrn_measured_fraction_theta_max 0.971
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'omega sacn'
_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  0.1257
_diffrn_reflns_av_sigmaI/netI    0.1338
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       26
_diffrn_reflns_limit_k_min       -27
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            9632
_diffrn_reflns_theta_full        26.45
_diffrn_reflns_theta_max         26.45
_diffrn_reflns_theta_min         1.88
_exptl_absorpt_coefficient_mu    0.090
_exptl_absorpt_correction_T_max  0.319
_exptl_absorpt_correction_T_min  0.173
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'psi scan'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.267
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             1504
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.571
_refine_diff_density_min         -0.282
_refine_diff_density_rms         0.086
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.390
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     238
_refine_ls_number_reflns         3477
_refine_ls_number_restraints     7
_refine_ls_restrained_S_all      1.393
_refine_ls_R_factor_all          0.2470
_refine_ls_R_factor_gt           0.1313
_refine_ls_shift/su_max          0.027
_refine_ls_shift/su_mean         0.005
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2684
_refine_ls_wR_factor_ref         0.3070
_reflns_number_gt                1667
_reflns_number_total             3477
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2sc00841f.txt
_cod_data_source_block           h
_cod_original_cell_volume        3726.8(15)
_cod_original_sg_symbol_H-M      Iba2
_cod_database_code               1515126