Siloxy(trialkoxy)ethene undergoes regioselective [2+2] cycloaddition to ynones and ynoates en route to functionalized cyclobutenediones
Iwata, Shin; Hamura, Toshiyuki; Suzuki, Keisuke; Chemical Communications 46 (2010) 5316–5318; doi:10.1039/c0cc00883d

data_7111753
_publ_section_title
;
 Siloxy(trialkoxy)ethene undergoes regioselective [2+2] cycloaddition to
 ynones and ynoates en route to functionalized cyclobutenediones
;
_journal_issue                   29
_journal_name_full               'Chemical Communications'
_journal_page_first              5316
_journal_page_last               5318
_journal_paper_doi               10.1039/c0cc00883d
_journal_volume                  46
_journal_year                    2010
_chemical_formula_moiety         'C19 H16 O5'
_chemical_formula_sum            'C19 H16 O5'
_chemical_formula_weight         324.32
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_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                 100.071(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.8511(9)
_cell_length_b                   9.3112(9)
_cell_length_c                   18.1359(17)
_cell_measurement_reflns_used    11394
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.50
_cell_measurement_theta_min      2.10
_cell_volume                     1637.9(3)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT & SADABS'
_computing_molecular_graphics    ORTEP-3
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker SMART CCD area detector system'
_diffrn_measurement_method       '\w scan'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0227
_diffrn_reflns_av_sigmaI/netI    0.0212
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            11394
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.10
_diffrn_source                   'rotating anode x-ray tube'
_exptl_absorpt_coefficient_mu    0.095
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.315
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       platelet
_exptl_crystal_F_000             680
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.252
_refine_diff_density_min         -0.214
_refine_diff_density_rms         0.040
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.035
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     281
_refine_ls_number_reflns         3762
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.035
_refine_ls_R_factor_all          0.0405
_refine_ls_R_factor_gt           0.0359
_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^)+(0.0463P)^2^+0.4326P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0929
_refine_ls_wR_factor_ref         0.0968
_reflns_number_gt                3318
_reflns_number_total             3762
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            C0CC00883Dsup1.cif
_cod_data_source_block           iwata
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7111753