Cyclooctatrienes from pyran-2-ones via a tandem [4+4]-photocycloaddition/decarboxylation process.
Li, Lei; Chase, Charles E; West, F G; Chemical communications (Cambridge, England)  (2008) 4025–4027; doi:10.1039/b806871b

data_7103316
_publ_section_title
;
 Cyclooctatrienes from pyran-2-ones via a tandem
 [4+4]-photocycloaddition/decarboxylation process.
;
_journal_issue                   34
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              4025
_journal_page_last               4027
_journal_paper_doi               10.1039/b806871b
_journal_year                    2008
_chemical_formula_moiety         'C16 H18 O5'
_chemical_formula_sum            'C16 H18 O5'
_chemical_formula_weight         290.30
_space_group_IT_number           7
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P -2yac'
_symmetry_space_group_name_H-M   'P 1 n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 98.648(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.7376(13)
_cell_length_b                   8.3473(10)
_cell_length_c                   16.1039(19)
_cell_measurement_reflns_used    4802
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      23.79
_cell_measurement_theta_min      2.14
_cell_volume                     1427.0(3)
_computing_cell_refinement       'Bruker SAINT (Bruker, 1997)'
_computing_data_collection       'Bruker SMART (Bruker, 1997)'
_computing_data_reduction        'Bruker SAINT (Bruker, 1997)'
_computing_molecular_graphics    'Bruker SHELXTL (Bruker, 1997)'
_computing_publication_material  'Bruker SHELXTL (Bruker, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR97 (Altomare et al., 1999)'
_diffrn_ambient_temperature      193(2)
_diffrn_detector_area_resol_mean 8.192
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type
'Bruker PLATFORM diffractometer/SMART 1000 CCD area detector'
_diffrn_measurement_method       '\w scans'
_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  0.0399
_diffrn_reflns_av_sigmaI/netI    0.0547
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            12166
_diffrn_reflns_theta_full        27.53
_diffrn_reflns_theta_max         27.53
_diffrn_reflns_theta_min         2.14
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.100
_exptl_absorpt_correction_T_max  0.9900
_exptl_absorpt_correction_T_min  0.9553
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1996)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.351
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             616
_exptl_crystal_size_max          0.46
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.425
_refine_diff_density_min         -0.301
_refine_diff_density_rms         0.072
_refine_ls_abs_structure_details
'Flack H D (1983), Acta Cryst. A39, 876-881. 3245 Friedel pairs.'
_refine_ls_abs_structure_Flack   -0.3(12)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.049
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     381
_refine_ls_number_reflns         6533
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.049
_refine_ls_R_factor_all          0.0823
_refine_ls_R_factor_gt           0.0623
_refine_ls_shift/su_max          0.005
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1066P)^2^+0.2782P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1653
_refine_ls_wR_factor_ref         0.1775
_reflns_number_gt                5088
_reflns_number_total             6533
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            b806871b.txt
_cod_data_source_block           3i(syn)
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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_sg_symbol_H-M      Pn
_cod_database_code               7103316