Thermal and palladium-catalyzed [3 + 2] synthesis of cyclopentadienone acetals from cyclopropenone acetals and acetylenes.
Isobe, Hiroyuki; Sato, Sota; Tanaka, Takatsugu; Tokuyama, Hidetoshi; Nakamura, Eiichi; Organic letters 6 (2004) 3569–3571; doi:10.1021/ol0483450

data_1506978
_publ_section_title
;
 Thermal and palladium-catalyzed [3 + 2] synthesis of cyclopentadienone
 acetals from cyclopropenone acetals and acetylenes.
;
_journal_issue                   20
_journal_name_full               'Organic letters'
_journal_page_first              3569
_journal_page_last               3571
_journal_paper_doi               10.1021/ol0483450
_journal_volume                  6
_journal_year                    2004
_chemical_compound_source        'Nakamura laboratory'
_chemical_formula_moiety         'C20 H22 O6 '
_chemical_formula_sum            'C20 H22 O6'
_chemical_formula_weight         358.390
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           maXus
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.1340(2)
_cell_length_b                   12.2180(7)
_cell_length_c                   18.9290(9)
_cell_measurement_temperature    298
_cell_volume                     1881.19(15)
_computing_cell_refinement       'HKL Scalepack'
_computing_data_collection       'DIP Image plate'
_computing_data_reduction        'maXus (Mackay et al., 1999)'
_computing_molecular_graphics    'Ortep (Johnson, 1976)'
_computing_publication_material  'maXus(Mackay et al., 1999)'
_computing_structure_refinement  'maXus(Mackay et al., 1999)'
_diffrn_measurement_device       'DIP Image plate'
_diffrn_measurement_method       IP
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           ' MoK\a'
_diffrn_radiation_wavelength_id  all
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            1957
_diffrn_reflns_theta_full        25.61
_diffrn_reflns_theta_max         25.61
_diffrn_reflns_theta_min         2.50
_exptl_absorpt_coefficient_mu    0.09
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.265
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Cube
_exptl_crystal_F_000             760
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.14
_refine_diff_density_min         -0.10
_refine_diff_density_rms         0.02
_refine_ls_abs_structure_details
;
;
_refine_ls_extinction_coef       56E5(9)
_refine_ls_extinction_expression
;
 equation(22) p292 'Crystallographic Computing' (1970)
 coefficient is multiplied by 10^4
;
_refine_ls_extinction_method     Zachariasen
_refine_ls_goodness_of_fit_all   0.235
_refine_ls_goodness_of_fit_gt    0.234
_refine_ls_goodness_of_fit_ref   0.234
_refine_ls_hydrogen_treatment    refxyz
_refine_ls_matrix_type           full
_refine_ls_number_constraints    22
_refine_ls_number_parameters     236
_refine_ls_number_reflns         1879
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.040
_refine_ls_R_factor_gt           0.039
_refine_ls_shift/su_max          0.029
_refine_ls_shift/su_mean         0.007
_refine_ls_structure_factor_coef F^2^
_refine_ls_weighting_details     ' w = 1 / ( s^2^(Fo^2^) + 0.10000 * Fo^2^)'
_refine_ls_weighting_scheme      sigma
_refine_ls_wR_factor_all         0.091
_refine_ls_wR_factor_gt          0.091
_refine_ls_wR_factor_ref         0.091
_reflns_d_resolution_high        0.64
_reflns_d_resolution_low         1.93
_reflns_limit_h_max              9
_reflns_limit_h_min              0
_reflns_limit_k_max              14
_reflns_limit_k_min              0
_reflns_limit_l_max              22
_reflns_limit_l_min              0
_reflns_number_gt                1879
_reflns_number_total             1950
_reflns_threshold_expression     'I> 3.00 sigma(I)'
_cod_data_source_file            ol0483450si20040820_035617.cif
_cod_data_source_block           14b
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' 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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'P 21 21 21    '
_cod_original_formula_sum        'C20 H22 O6 '
_cod_database_code               1506978