Photoinduced [2+2] cycloadditions (the Paterno–Büchi reaction) of 1-acetylisatin with enol ethers—regioselectivity, diastereoselectivity and acid catalysed transformations of the spirooxetane products
Zhang, Yan; Xue, Jie; Gao, Yi; Fun, Hoong-Kun; Xu, Jian-Hua; Journal of the Chemical Society, Perkin Transactions 1  (2002) 345–353; doi:10.1039/b109697d

data_7204302
_publ_section_title
;
 Photoinduced [2+2] cycloadditions (the Paterno--B\"uchi reaction) of
 1-acetylisatin with enol ethers---regioselectivity, diastereoselectivity
 and acid catalysed transformations of the spirooxetane products
;
_journal_coden_ASTM              JCSPCE
_journal_issue                   3
_journal_name_full
'Journal of the Chemical Society, Perkin Transactions 1'
_journal_page_first              345
_journal_page_last               353
_journal_paper_doi               10.1039/b109697d
_journal_year                    2002
_chemical_formula_sum            'C14 H13 N O5'
_chemical_formula_weight         275.25
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                68.82(3)
_cell_angle_beta                 68.35(3)
_cell_angle_gamma                68.44(3)
_cell_formula_units_Z            2
_cell_length_a                   8.3660(17)
_cell_length_b                   9.6653(19)
_cell_length_c                   9.7304(19)
_cell_measurement_reflns_used    20
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      32.060
_cell_measurement_theta_min      15.660
_cell_volume                     656.5(3)
_computing_cell_refinement       'AFC5R (RIGAKU)'
_computing_data_collection       'AFC5R (RIGAKU)'
_computing_data_reduction        'Enraf-Nonius Molen/VAX Software'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 1994)'
_computing_publication_material  'SHELXTL (Sheldrick, 1994)'
_computing_structure_refinement  'SHELXTL (Sheldrick, 1994)'
_computing_structure_solution    'SHELXTL (Sheldrick, 1994)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.811
_diffrn_measured_fraction_theta_max 0.811
_diffrn_measurement_device_type  'AFC5R (RIGAKU)'
_diffrn_measurement_method       \w/2\q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0265
_diffrn_reflns_av_sigmaI/netI    0.0880
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       0
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            2224
_diffrn_reflns_theta_full        26.01
_diffrn_reflns_theta_max         26.01
_diffrn_reflns_theta_min         2.33
_diffrn_standards_decay_%        0.5
_diffrn_standards_interval_count 300
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.107
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.5457
_exptl_absorpt_correction_type   'empirical psi-scan'
_exptl_crystal_density_diffrn    1.392
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             288
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.408
_refine_diff_density_min         -0.389
_refine_diff_density_rms         0.079
_refine_ls_extinction_coef       0.035(13)
_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   0.972
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     182
_refine_ls_number_reflns         2099
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.972
_refine_ls_R_factor_all          0.1138
_refine_ls_R_factor_gt           0.0742
_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^)+(0.1507P)^2^+0.0000P] where P==(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1933
_refine_ls_wR_factor_ref         0.2025
_reflns_number_gt                1399
_reflns_number_total             2099
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b109697d.txt
_cod_data_source_block           compound18
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_cell_volume        656.5(2)
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7204302