Straightforward formation of carbocations from tertiary carboxylic acids via CO release at room temperature.
Bartalucci, Niccolò; Bortoluzzi, Marco; Zacchini, Stefano; Pampaloni, Guido; Marchetti, Fabio; Dalton transactions (Cambridge, England : 2003) 48 (2019) 1574–1577; doi:10.1039/c8dt04416c

data_7048319
_publ_section_title
;
 Straightforward formation of carbocations from tertiary carboxylic acids
 via CO release at room temperature.
;
_journal_issue                   5
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              1574
_journal_page_last               1577
_journal_paper_doi               10.1039/c8dt04416c
_journal_volume                  48
_journal_year                    2019
_chemical_formula_sum            'C19 H15 Cl5 O W'
_chemical_formula_weight         620.41
_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
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2018-09-26 deposited with the CCDC.
2018-11-23 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 103.080(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   14.275(2)
_cell_length_b                   7.9205(11)
_cell_length_c                   18.698(3)
_cell_measurement_reflns_used    5470
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.8955
_cell_measurement_theta_min      2.2365
_cell_volume                     2059.2(5)
_computing_cell_refinement       'APEX3 (Bruker AXS, 2015)'
_computing_data_collection       'APEX3 (Bruker AXS, 2015)'
_computing_data_reduction        'SAINT (Bruker AXS, 2015)'
_computing_molecular_graphics    'ORTEPIII (Johnson, 1996)'
_computing_publication_material  'XCIF 2014/2 (Bruker AXS, 2014)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0568
_diffrn_reflns_av_unetI/netI     0.0461
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            16758
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        25.049
_diffrn_reflns_theta_max         25.049
_diffrn_reflns_theta_min         1.465
_exptl_absorpt_coefficient_mu    6.265
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.3935
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details
; 
 Data were corrected for Lorentz polarization and absorption
 effects (empirical absorption correction SADABS).
 R(int) =  0.1360 (selected reflections only, before parameter refinement)
 R(int) =  0.0657(selected reflections only, after parameter refinement)
;
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    2.001
_exptl_crystal_description       plate
_exptl_crystal_F_000             1184
_exptl_crystal_size_max          0.180
_exptl_crystal_size_mid          0.160
_exptl_crystal_size_min          0.110
_refine_diff_density_max         2.845
_refine_diff_density_min         -1.399
_refine_diff_density_rms         0.165
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.076
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     235
_refine_ls_number_reflns         3654
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.094
_refine_ls_R_factor_all          0.0441
_refine_ls_R_factor_gt           0.0374
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0262P)^2^+14.2528P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0845
_refine_ls_wR_factor_ref         0.0875
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3244
_reflns_number_total             3654
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c8dt04416c3.cif
_cod_data_source_block           1
_cod_depositor_comments
'Adding full bibliography for 7048319--7048320.cif.'
_cod_database_code               7048319
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.398
_shelx_estimated_absorpt_t_max   0.546
_shelx_res_checksum              20998
_shelx_hkl_checksum              9759