Synthesis of a peralkynylated pyrazino[2,3-g]quinoxaline.
Miao, Shaobin; Smith, Mark D.; Bunz, Uwe H. F.; Organic letters 8 (2006) 757–760; doi:10.1021/ol0529851

data_1505853
_publ_section_title
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 Synthesis of a peralkynylated pyrazino[2,3-g]quinoxaline.
;
_journal_issue                   4
_journal_name_full               'Organic letters'
_journal_page_first              757
_journal_page_last               760
_journal_paper_doi               10.1021/ol0529851
_journal_volume                  8
_journal_year                    2006
_chemical_formula_moiety         'C54 H84 N4 O2 Si4'
_chemical_formula_sum            'C54 H84 N4 O2 Si4'
_chemical_formula_weight         933.61
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                69.3430(10)
_cell_angle_beta                 60.6070(10)
_cell_angle_gamma                61.7100(10)
_cell_formula_units_Z            1
_cell_length_a                   12.3888(7)
_cell_length_b                   12.4270(7)
_cell_length_c                   12.5757(7)
_cell_measurement_reflns_used    2038
_cell_measurement_temperature    294(1)
_cell_measurement_theta_max      23.327
_cell_measurement_theta_min      2.208
_cell_volume                     1467.06(14)
_computing_cell_refinement       'SAINT+ NT V6.22 (Bruker, 2001)'
_computing_data_collection       'SMART NT V5.625 (Bruker, 1998)'
_computing_data_reduction        'SAINT+ NT V6.22'
_computing_molecular_graphics    'SHELXTL V6.1 (Sheldrick, 2000)'
_computing_publication_material  'SHELXTL V6.1'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      294(1)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker SMART APEX CCD diffractometer'
_diffrn_measurement_method       '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  0.0125
_diffrn_reflns_av_sigmaI/netI    0.0156
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            12114
_diffrn_reflns_theta_full        25.02
_diffrn_reflns_theta_max         25.02
_diffrn_reflns_theta_min         1.88
_diffrn_standards_decay_%        none
_exptl_absorpt_coefficient_mu    0.140
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.9423
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            green
_exptl_crystal_density_diffrn    1.057
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             508
_exptl_crystal_size_max          0.56
_exptl_crystal_size_mid          0.44
_exptl_crystal_size_min          0.32
_refine_diff_density_max         0.585
_refine_diff_density_min         -0.293
_refine_diff_density_rms         0.045
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.045
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     301
_refine_ls_number_reflns         5170
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.045
_refine_ls_R_factor_all          0.0576
_refine_ls_R_factor_gt           0.0522
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0889P)^2^+0.4823P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1494
_refine_ls_wR_factor_ref         0.1560
_reflns_number_gt                4542
_reflns_number_total             5170
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol0529851si20051209_013124.cif
_cod_data_source_block           sm02s
_cod_depositor_comments
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The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
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_cod_database_code               1505853