Synthesis of nucleic-acid base containing norbornene derivatives as monomers for ring-opening-metathesis–polymerization
R. Gareth Davies; Vernon C. Gibson; Michael B. Hursthouse; Mark E. Light; Edward L. Marshall; Michael North; David A. Robson; Ian Thompson; Andrew J. P. White; David J. Williams; Paul J. Williams; Journal of the Chemical Society, Perkin Transactions 1  (2001) 3365–3381; doi:10.1039/b107139d

data_7213501
_publ_section_title
;
 Synthesis of nucleic-acid base containing norbornene derivatives as
 monomers for ring-opening-metathesis--polymerization
;
_journal_issue                   24
_journal_name_full
'Journal of the Chemical Society, Perkin Transactions 1'
_journal_page_first              3365
_journal_page_last               3381
_journal_paper_doi               10.1039/b107139d
_journal_year                    2001
_chemical_formula_sum            'C23 H27 N7 O5'
_chemical_formula_weight         481.52
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 91.589(8)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   37.962(4)
_cell_length_b                   12.6553(8)
_cell_length_c                   9.5517(9)
_cell_measurement_reflns_used    22
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.43
_cell_measurement_theta_min      4.68
_cell_volume                     4587.1(7)
_computing_cell_refinement       'Siemens XSCANS'
_computing_data_collection       'Siemens XSCANS'
_computing_data_reduction        'Siemens SHELXTL'
_computing_molecular_graphics    'Siemens SHELXTL'
_computing_publication_material  'Siemens SHELXTL'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measurement_device       'Siemens P4'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0213
_diffrn_reflns_av_sigmaI/netI    0.0444
_diffrn_reflns_limit_h_max       44
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            3874
_diffrn_reflns_theta_max         63.98
_diffrn_reflns_theta_min         2.33
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.840
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Clear
_exptl_crystal_density_diffrn    1.395
_exptl_crystal_description       'platy needles'
_exptl_crystal_F_000             2032
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.324
_refine_diff_density_min         -0.278
_refine_diff_density_rms         0.059
_refine_ls_extinction_coef       0.00070(9)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_all   1.057
_refine_ls_goodness_of_fit_obs   1.065
_refine_ls_matrix_type           full
_refine_ls_number_parameters     325
_refine_ls_number_reflns         3811
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.058
_refine_ls_restrained_S_obs      1.064
_refine_ls_R_factor_all          0.0863
_refine_ls_R_factor_obs          0.0628
_refine_ls_shift/esd_max         -0.001
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0937P)^2^+4.1688P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1798
_refine_ls_wR_factor_obs         0.1547
_reflns_number_observed          2853
_reflns_number_total             3812
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            b107139dsup1.cif
_cod_data_source_block           VG9747
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0937P)^2^+4.1688P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0937P)^2^+4.1688P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        4587.0(7)
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               7213501