Reactivity of 2-acylaminoacrylates with ketene diethyl acetal; [2 + 2] cycloadditions vs. tandem condensations
Avenoza, Alberto; Busto, Jesús H.; Canal, Noelia; Peregrina, Jesús M.; Chemical Communications (Cambridge, United Kingdom)  (2003) 1376–1377; doi:10.1039/b302000b

data_7103701
_publ_section_title
;
 Reactivity of 2-acylaminoacrylates with ketene diethyl acetal;
 [2 + 2] cycloadditions vs. tandem condensations
;
_journal_coden_ASTM              CHCOFS
_journal_issue                   12
_journal_name_full
;
 Chemical Communications (Cambridge, United Kingdom)
;
_journal_page_first              1376
_journal_page_last               1377
_journal_paper_doi               10.1039/b302000b
_journal_year                    2003
_chemical_formula_sum            'C23 H31 N O3 Si'
_chemical_formula_weight         397.58
_chemical_name_common            AcNH-C4Ser-CH2O-SiPh2tBu
_chemical_name_systematic        AcNH-C4Ser-CH2O-SiPh2tBu
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_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                 121.0891(9)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.8810(3)
_cell_length_b                   8.8310(2)
_cell_length_c                   18.6380(4)
_cell_measurement_reflns_used    20035
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.88
_cell_measurement_theta_min      1.02
_cell_volume                     2238.44(8)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       KappaCCD
_computing_data_reduction
'Denzo and Scalepak (Otwinowski & Minor, 1997'
_computing_molecular_graphics    ORTEP-III
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       CCD
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0392
_diffrn_reflns_av_sigmaI/netI    0.0427
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            16905
_diffrn_reflns_theta_full        27.92
_diffrn_reflns_theta_max         27.92
_diffrn_reflns_theta_min         1.28
_exptl_absorpt_coefficient_mu    0.127
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.180
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    .
_exptl_crystal_description       Prism
_exptl_crystal_F_000             856
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.642
_refine_diff_density_min         -0.334
_refine_diff_density_rms         0.047
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.046
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     253
_refine_ls_number_reflns         5311
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.046
_refine_ls_R_factor_all          0.0682
_refine_ls_R_factor_gt           0.0501
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0658P)^2^+1.0465P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1314
_refine_ls_wR_factor_ref         0.1440
_reflns_number_gt                4114
_reflns_number_total             5311
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b302000b.txt
_cod_data_source_block           shelxl_2
_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      'P 21/c'
_cod_original_formula_sum        'C23 H31 N1 O3 Si1'
_cod_database_code               7103701