Synthesis of highly substituted oxetanes via [2+2] cycloaddition reactions of allenoates catalyzed by a guanidine Lewis base
Philipp Selig; Aleksej Turockin; William Raven; Chem.Commun. 49 (2013) 2930–; doi:10.1039/c3cc40855h

data_7109047
_publ_section_title
;
 Synthesis of highly substituted oxetanes via [2+2] cycloaddition
 reactions of allenoates catalyzed by a guanidine Lewis base
;
_journal_name_full               Chem.Commun.
_journal_page_first              2930
_journal_paper_doi               10.1039/c3cc40855h
_journal_volume                  49
_journal_year                    2013
_chemical_formula_moiety         'C15 H15 F3 O3'
_chemical_formula_sum            'C15 H15 F3 O3'
_chemical_formula_weight         300.27
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_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-2012
_cell_angle_alpha                90
_cell_angle_beta                 100.199(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.8832(11)
_cell_length_b                   7.3687(8)
_cell_length_c                   19.706(2)
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      26.66
_cell_measurement_theta_min      2
_cell_volume                     1412.4(3)
_computing_cell_refinement       SMART
_computing_data_collection       'SMART (Bruker, 2001)'
_computing_data_reduction        'SAINT (Bruker, 1999)'
_computing_molecular_graphics    'PLATON (Spek, 2003)'
_computing_publication_material  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  'multilayer optics'
_diffrn_radiation_source         'Incoatec microsource'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0349
_diffrn_reflns_av_unetI/netI     0.0232
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            16404
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.572
_diffrn_reflns_theta_min         2.094
_exptl_absorpt_coefficient_mu    0.123
_exptl_absorpt_correction_T_max  0.7454
_exptl_absorpt_correction_T_min  0.6904
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.412
_exptl_crystal_description       block
_exptl_crystal_F_000             624
_exptl_crystal_size_max          0.350
_exptl_crystal_size_mid          0.320
_exptl_crystal_size_min          0.300
_refine_diff_density_max         0.299
_refine_diff_density_min         -0.218
_refine_diff_density_rms         0.041
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.032
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     192
_refine_ls_number_reflns         2948
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.032
_refine_ls_R_factor_all          0.0431
_refine_ls_R_factor_gt           0.0360
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
w=1/[\s^2^(Fo^2^)+(0.0358P)^2^+0.6863P]
where P=(Fo^2^+2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0841
_refine_ls_wR_factor_ref         0.0888
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2561
_reflns_number_total             2948
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c3cc40855h.txt
_cod_data_source_block           (E)-3aa
_cod_database_code               7109047
_shelx_estimated_absorpt_t_min   0.958
_shelx_estimated_absorpt_t_max   0.964