Zinc-mediated addition of diethyl bromomalonate to alkynes for the cascade reaction towards polysubstituted pyranones and tetracarbonyl derivatives
Anne Miersch; Klaus Harms; Gerhard Hilt; Chem.Commun. 50 (2014) 542–; doi:10.1039/c3cc46788k

data_7110224
_publ_section_title
;
 Zinc-mediated addition of diethyl bromomalonate to alkynes for the
 cascade reaction towards polysubstituted pyranones and tetracarbonyl
 derivatives
;
_journal_name_full               Chem.Commun.
_journal_page_first              542
_journal_paper_doi               10.1039/c3cc46788k
_journal_volume                  50
_journal_year                    2014
_chemical_formula_sum            'C18 H20 O4'
_chemical_formula_weight         300.34
_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-2013
_cell_angle_alpha                90
_cell_angle_beta                 104.301(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.7240(4)
_cell_length_b                   16.7441(6)
_cell_length_c                   9.1552(3)
_cell_measurement_reflns_used    143
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      21.9880
_cell_measurement_theta_min      2.6456
_cell_volume                     1593.00(10)
_computing_cell_refinement       'APEX2 v2013.4-1 (Bruker AXS)'
_computing_data_collection       'BRUKER APEX II'
_computing_data_reduction        'SAINT V8.30C (Bruker AXS Inc., 2013)'
_computing_molecular_graphics    'DIAMOND (Crystal Impact)'
_computing_structure_refinement  'SHELXL-2013 (Sheldrick, 2013)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 10.4167
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker D8 QUEST area detector'
_diffrn_measurement_method       '\w and \f scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0417
_diffrn_reflns_av_unetI/netI     0.0245
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            19656
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.499
_diffrn_reflns_theta_min         2.307
_diffrn_source                   'microfocus sealed X-ray tube'
_exptl_absorpt_coefficient_mu    0.088
_exptl_absorpt_correction_T_max  0.99
_exptl_absorpt_correction_T_min  0.93
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS V2012/1 (Bruker AXS Inc.)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.252
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             640
_exptl_crystal_size_max          0.370
_exptl_crystal_size_mid          0.160
_exptl_crystal_size_min          0.130
_refine_diff_density_max         0.212
_refine_diff_density_min         -0.183
_refine_diff_density_rms         0.038
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.048
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     203
_refine_ls_number_reflns         2951
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.048
_refine_ls_R_factor_all          0.0466
_refine_ls_R_factor_gt           0.0334
_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^)+(0.0321P)^2^+0.6180P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0738
_refine_ls_wR_factor_ref         0.0801
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2449
_reflns_number_total             2951
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c3cc46788k.txt
_cod_data_source_block           AXM669_0m
_cod_database_code               7110224
_shelx_estimated_absorpt_t_min   0.968
_shelx_estimated_absorpt_t_max   0.989
_shelxl_version_number           2013-3
_shelx_res_checksum              81774
_shelx_hkl_checksum              44582