Acylammonium salts as dienophiles in diels-alder/lactonization organocascades.
Abbasov, Mikail E.; Hudson, Brandi M.; Tantillo, Dean J.; Romo, Daniel; Journal of the American Chemical Society 136 (2014) 4492–4495; doi:10.1021/ja501005g

data_4121520
_publ_section_title
;
 Acylammonium salts as dienophiles in diels-alder/lactonization
 organocascades.
;
_journal_issue                   12
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              4492
_journal_page_last               4495
_journal_paper_doi               10.1021/ja501005g
_journal_volume                  136
_journal_year                    2014
_chemical_formula_sum            'C20 H34 O5 Si'
_chemical_formula_weight         382.56
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 95.850(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            20
_cell_length_a                   16.6474(7)
_cell_length_b                   34.4793(14)
_cell_length_c                   19.1312(8)
_cell_measurement_reflns_used    9812
_cell_measurement_temperature    110(2)
_cell_measurement_theta_max      62.51
_cell_measurement_theta_min      4.51
_cell_volume                     10923.9(8)
_computing_cell_refinement
; 
  CELL-NOW (Sheldrick, 2003) and SAINT (BRUKER-NONIUS, 2003) 
;
_computing_data_collection       'FRAMBO (BRUKER-NONIUS, 2003)'
_computing_data_reduction        'Bruker APEX2'
_computing_molecular_graphics    Olex2
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      110(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'BRUKER GADDS D8 Discover'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0593
_diffrn_reflns_av_sigmaI/netI    0.0492
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       35
_diffrn_reflns_limit_k_min       -37
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            225412
_diffrn_reflns_theta_full        60.00
_diffrn_reflns_theta_max         60.00
_diffrn_reflns_theta_min         2.32
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    1.155
_exptl_absorpt_correction_T_max  0.9445
_exptl_absorpt_correction_T_min  0.7380
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS; (Sheldrick, 2006)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.163
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             4160
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.720
_refine_diff_density_min         -0.591
_refine_diff_density_rms         0.113
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.013(14)
_refine_ls_extinction_coef       0.00031(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.069
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     2412
_refine_ls_number_reflns         31523
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.069
_refine_ls_R_factor_all          0.0610
_refine_ls_R_factor_gt           0.0551
_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^)+(0.1141P)^2^+0.3748P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1469
_refine_ls_wR_factor_ref         0.1564
_reflns_number_gt                28456
_reflns_number_total             31523
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja501005g_si_002.cif
_cod_data_source_block           drb
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/crontab/automatic-downloads/current/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               4121520