Development of a Continuous Flow Photoisomerization Reaction Converting Isoxazoles into Diverse Oxazole Products.
Bracken, Cormac; Baumann, Marcus; The Journal of organic chemistry  (2020) –; doi:10.1021/acs.joc.9b03399

data_4037853
_publ_section_title
;
 Development of a Continuous Flow Photoisomerization Reaction Converting
 Isoxazoles into Diverse Oxazole Products.
;
_journal_name_full               'The Journal of organic chemistry'
_journal_paper_doi               10.1021/acs.joc.9b03399
_journal_year                    2020
_chemical_formula_moiety         'C13 H13 N O4'
_chemical_formula_sum            'C13 H13 N O4'
_chemical_formula_weight         247.24
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2014
_cell_angle_alpha                90
_cell_angle_beta                 109.660(7)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   13.350(1)
_cell_length_b                   8.1964(5)
_cell_length_c                   11.5379(7)
_cell_measurement_reflns_used    1302
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      76.1720
_cell_measurement_theta_min      6.4570
_cell_volume                     1188.90(15)
_computing_cell_refinement       'CrysAlisPro 1.171.38.41 (Rigaku OD, 2015)'
_computing_data_collection       'CrysAlisPro 1.171.38.41 (Rigaku OD, 2015)'
_computing_data_reduction        'CrysAlisPro 1.171.38.41 (Rigaku OD, 2015)'
_computing_structure_refinement  'SHELXL-2014 (Sheldrick, 2014)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 10.3196
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.985
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, Atlas'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0357
_diffrn_reflns_av_unetI/netI     0.0491
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.985
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            5673
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.985
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         76.696
_diffrn_reflns_theta_min         3.516
_diffrn_source                   'micro-focus sealed X-ray tube'
_exptl_absorpt_coefficient_mu    0.863
_exptl_absorpt_correction_T_max  0.980
_exptl_absorpt_correction_T_min  0.903
_exptl_absorpt_correction_type   gaussian
_exptl_absorpt_process_details
; 
CrysAlisPro 1.171.38.41 (Rigaku Oxford Diffraction, 2015) 
Numerical absorption correction based on gaussian integration over 
a multifaceted crystal model 
Empirical absorption correction using spherical harmonics, 
implemented in SCALE3 ABSPACK scaling algorithm. 
;
_exptl_crystal_colour            'clear colourless'
_exptl_crystal_density_diffrn    1.381
_exptl_crystal_description       plate
_exptl_crystal_F_000             520
_exptl_crystal_size_max          0.195
_exptl_crystal_size_mid          0.139
_exptl_crystal_size_min          0.023
_refine_diff_density_max         0.254
_refine_diff_density_min         -0.239
_refine_diff_density_rms         0.056
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.050
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     165
_refine_ls_number_reflns         2468
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.050
_refine_ls_R_factor_all          0.0646
_refine_ls_R_factor_gt           0.0460
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0589P)^2^+0.0732P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1127
_refine_ls_wR_factor_ref         0.1267
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1882
_reflns_number_total             2468
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo9b03399_si_002.cif
_cod_data_source_block           bau10
_cod_original_cell_volume        1188.90(14)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4037853
_shelxl_version_number           2014-3
_shelx_res_checksum              22345
_shelx_hkl_checksum              93071