Ruthenium-Catalyzed Dimerization of Propiolates: A Simple Route to α-Pyrones.
Manikandan, Rajendran; Jeganmohan, Masilamani; Organic letters 16 (2014) 652–655; doi:10.1021/ol4035929

data_1513472
_publ_section_title
;
 Ruthenium-Catalyzed Dimerization of Propiolates: A Simple Route to
 \a-Pyrones.
;
_journal_issue                   3
_journal_name_full               'Organic letters'
_journal_page_first              652
_journal_page_last               655
_journal_paper_doi               10.1021/ol4035929
_journal_volume                  16
_journal_year                    2014
_chemical_formula_moiety         C20
_chemical_formula_sum            'C20 H14 O4'
_chemical_formula_weight         318.31
_chemical_name_common            Pyrone-2
_chemical_name_systematic
; 
 ethyl 2-oxo-4,6-diphenyl-2H-pyran-5-carboxylate 
;
_space_group_IT_number           14
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 93.607(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.0981(12)
_cell_length_b                   8.6701(10)
_cell_length_c                   18.677(2)
_cell_measurement_temperature    296(2)
_cell_volume                     1632.0(3)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_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  0.0493
_diffrn_reflns_av_sigmaI/netI    0.0467
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            15001
_diffrn_reflns_theta_full        28.33
_diffrn_reflns_theta_max         28.33
_diffrn_reflns_theta_min         2.19
_exptl_absorpt_coefficient_mu    0.090
_exptl_crystal_density_diffrn    1.296
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             664
_refine_diff_density_max         0.738
_refine_diff_density_min         -0.509
_refine_diff_density_rms         0.055
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.425
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     218
_refine_ls_number_reflns         4066
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.425
_refine_ls_R_factor_all          0.1094
_refine_ls_R_factor_gt           0.0716
_refine_ls_shift/su_max          0.017
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2118
_refine_ls_wR_factor_ref         0.2394
_reflns_number_gt                2564
_reflns_number_total             4066
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol4035929_si_001.cif
_cod_data_source_block           Pyrone2
_cod_original_cell_volume        1631.9(3)
_cod_original_sg_symbol_H-M      P21/n
_cod_database_code               1513472