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_1515122
_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            'C22 H22 O4'
_chemical_formula_weight         350.40
_chemical_name_systematic
;
?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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                 110.365(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.534(2)
_cell_length_b                   19.600(5)
_cell_length_c                   10.977(3)
_cell_measurement_temperature    293(2)
_cell_volume                     1923.0(8)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.974
_diffrn_measured_fraction_theta_max 0.974
_diffrn_measurement_device_type  'CCD area detector'
_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  0.1455
_diffrn_reflns_av_sigmaI/netI    0.1843
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            13767
_diffrn_reflns_theta_full        25.70
_diffrn_reflns_theta_max         25.70
_diffrn_reflns_theta_min         2.08
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_T_max  0.432
_exptl_absorpt_correction_T_min  0.309
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'psi scan'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.210
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             744
_exptl_crystal_size_max          0.3
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.167
_refine_diff_density_min         -0.142
_refine_diff_density_rms         0.029
_refine_ls_extinction_coef       0.0085(16)
_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   0.797
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     238
_refine_ls_number_reflns         3575
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      0.813
_refine_ls_R_factor_all          0.2384
_refine_ls_R_factor_gt           0.0512
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0563P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1108
_refine_ls_wR_factor_ref         0.1584
_reflns_number_gt                962
_reflns_number_total             3575
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2sc00841f.txt
_cod_data_source_block           f1102091
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               1515122