Novel synthesis of highly functionalized pyrazolines and pyrazoles by triphenylphosphine-mediated reaction of dialkyl azodicarboxylate with allenic esters.
Nair, Vijay; Biju, A. T.; Mohanan, Kishor; Suresh, Eringathodi; Organic letters 8 (2006) 2213–2216; doi:10.1021/ol0604623

data_1505939
_publ_section_title
;
 Novel synthesis of highly functionalized pyrazolines and pyrazoles by
 triphenylphosphine-mediated reaction of dialkyl azodicarboxylate with
 allenic esters.
;
_journal_issue                   11
_journal_name_full               'Organic letters'
_journal_page_first              2213
_journal_page_last               2216
_journal_paper_doi               10.1021/ol0604623
_journal_volume                  8
_journal_year                    2006
_chemical_formula_sum            'C19 H23 N3 O7'
_chemical_formula_weight         405.40
_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                 93.760(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.202(2)
_cell_length_b                   8.4447(19)
_cell_length_c                   27.273(6)
_cell_measurement_temperature    295(2)
_cell_volume                     2114.8(8)
_computing_cell_refinement       'BRUKER SMART'
_computing_data_collection       'BRUKER SMART'
_computing_data_reduction        'BRUKER SAINT'
_computing_molecular_graphics    ORTEP
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 0.920
_diffrn_measured_fraction_theta_max 0.920
_diffrn_measurement_device_type  'BRUKER SMART APEX CCD DIFFARCTOMETER'
_diffrn_measurement_method       'OMEGA-PHI SCAN'
_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  0.0463
_diffrn_reflns_av_sigmaI/netI    0.0559
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            8082
_diffrn_reflns_theta_full        22.50
_diffrn_reflns_theta_max         22.50
_diffrn_reflns_theta_min         2.53
_exptl_absorpt_coefficient_mu    0.098
_exptl_crystal_colour            COLOURLESS
_exptl_crystal_density_diffrn    1.273
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       BLOCK
_exptl_crystal_F_000             856
_exptl_crystal_size_max          O.30
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.19
_refine_diff_density_max         0.267
_refine_diff_density_min         -0.178
_refine_diff_density_rms         0.041
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.999
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     265
_refine_ls_number_reflns         2754
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.999
_refine_ls_R_factor_all          0.1126
_refine_ls_R_factor_gt           0.0685
_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^)+(0.1177P)^2^+0.2126P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1830
_refine_ls_wR_factor_ref         0.2126
_reflns_number_gt                1667
_reflns_number_total             2754
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol0604623si20060222_045348.cif
_cod_data_source_block           vijay8of
_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 2.4.1 from 2010-06-29.

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

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.1177P)^2^+0.2126P] 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^)+(0.1177P)^2^+0.2126P] 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        2114.9(8)
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               1505939