Formal Intramolecular (4 + 1)-Cycloaddition of Dialkoxycarbenes: Control of the Stereoselectivity and a Mechanistic Portrait
Francis Beaumier; Marianne Dupuis; Claude Spino; Claude Y. Legault; Journal of the American Chemical Society 134 (2012) 5938–5953; doi:10.1021/ja211927b

data_4117749
_publ_section_title
;
 Formal Intramolecular (4 + 1)-Cycloaddition of Dialkoxycarbenes: Control
 of the Stereoselectivity and a Mechanistic Portrait
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              5938
_journal_page_last               5953
_journal_paper_doi               10.1021/ja211927b
_journal_volume                  134
_journal_year                    2012
_chemical_formula_sum            'C12 H18 O4'
_chemical_formula_weight         226.26
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yab'
_symmetry_space_group_name_H-M   'P 1 21/a 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.3
_audit_creation_date             2009-09-21T13:54:24-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 96.52(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.155(3)
_cell_length_b                   20.687(5)
_cell_length_c                   8.002(2)
_cell_measurement_reflns_used    20
_cell_measurement_temperature    198(2)
_cell_measurement_theta_max      12.5
_cell_measurement_theta_min      10
_cell_volume                     1176.8(6)
_computing_cell_refinement       Difrac
_computing_data_collection       Difrac
_computing_data_reduction        NRCVAX
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      198(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  CAD4
_diffrn_measurement_method       Omega
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0
_diffrn_reflns_av_unetI/netI     0.0815
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            2201
_diffrn_reflns_theta_full        25.5
_diffrn_reflns_theta_max         25.59
_diffrn_reflns_theta_min         2.56
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 100
_diffrn_standards_number         1
_exptl_absorpt_coefficient_mu    0.095
_exptl_absorpt_correction_T_max  0.9721
_exptl_absorpt_correction_T_min  0.963
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   empirical
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.277
_exptl_crystal_description       Prism
_exptl_crystal_F_000             488
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.3
_refine_diff_density_max         0.256
_refine_diff_density_min         -0.258
_refine_diff_density_rms         0.059
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.965
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     145
_refine_ls_number_reflns         2201
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.965
_refine_ls_R_factor_all          0.1362
_refine_ls_R_factor_gt           0.0593
_refine_ls_shift/su_max          0
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0663P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1188
_refine_ls_wR_factor_ref         0.1378
_reflns_number_gt                1225
_reflns_number_total             2201
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja211927b_si_004.cif
_cod_data_source_block           fb5053a
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_absorpt_correction_type' value 'Psi-Scan' changed to
'psi-scan' according to the built-in table from CIF Core 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_database_code               4117749