Reactive Iron Carbonyl Reagents via Reaction of Metal Alkoxides with Fe(CO)5 or Fe2(CO)9: Synthesis of Cyclobutenediones via Double Carbonylation of Alkynes
Mallesh Beesu; Mariappan Periasamy; Journal of Organic Chemistry 76 (2011) 543–549; doi:10.1021/jo102104a

data_4025993
_publ_contact_author_address
; 
School of Chemistry
University of Hyderabad
Hyderabad 500 046,
India
;
_publ_contact_author_email       mpsc@uohyd.ernet.in
_publ_section_title
;
 Reactive Iron Carbonyl Reagents via Reaction of Metal Alkoxides with
 Fe(CO)5 or Fe2(CO)9: Synthesis of Cyclobutenediones via Double
 Carbonylation of Alkynes
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              543
_journal_page_last               549
_journal_paper_doi               10.1021/jo102104a
_journal_volume                  76
_journal_year                    2011
_chemical_formula_moiety         'C26 H16 Fe2 O10'
_chemical_formula_sum            'C26 H16 Fe2 O10'
_chemical_formula_weight         600.09
_chemical_melting_point          140(2)
_chemical_name_common            'Ferrole complex'
_chemical_name_systematic
;
[Tricarbonyl-p-(1,1,1-tricarbonyl-4,5-dialkyl-
2,3-diacetyloxyferracyclopentadiene)Iron]'
;
_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                 96.75(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.411(3)
_cell_length_b                   18.877(4)
_cell_length_c                   8.4637(17)
_cell_measurement_temperature    298
_cell_volume                     2603.8(9)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      298
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_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  0.0305
_diffrn_reflns_av_sigmaI/netI    0.0237
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            26466
_diffrn_reflns_theta_full        25.94
_diffrn_reflns_theta_max         25.94
_diffrn_reflns_theta_min         1.65
_exptl_absorpt_coefficient_mu    1.170
_exptl_absorpt_correction_T_max  0.6152
_exptl_absorpt_correction_T_min  0.5308
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'Bruker SADABS'
_exptl_crystal_colour            stray
_exptl_crystal_density_diffrn    1.531
_exptl_crystal_description       block
_exptl_crystal_F_000             1216
_exptl_crystal_size_max          0.62
_exptl_crystal_size_mid          0.56
_exptl_crystal_size_min          0.46
_refine_diff_density_max         0.496
_refine_diff_density_min         -0.215
_refine_diff_density_rms         0.060
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.038
_refine_ls_hydrogen_treatment    noref
_refine_ls_matrix_type           full
_refine_ls_number_parameters     345
_refine_ls_number_reflns         5076
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.038
_refine_ls_R_factor_all          0.0440
_refine_ls_R_factor_gt           0.0366
_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^)+(0.0530P)^2^+0.8711P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0915
_refine_ls_wR_factor_ref         0.0959
_reflns_number_gt                4349
_reflns_number_total             5076
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo102104a_si_003_2.cif
_cod_data_source_block           mp159_m
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4025993