An Experimental and Computational Approach to Understanding the Reactions of Acyl Nitroso Compounds in [4 + 2] Cycloadditions.
Chaiyaveij, Duangduan; Batsanov, Andrei S.; Fox, Mark A.; Marder, Todd B.; Whiting, Andrew; The Journal of organic chemistry 80 (2015) 9518–9534; doi:10.1021/acs.joc.5b01470

data_4036303
_publ_section_title
;
 An Experimental and Computational Approach to Understanding the Reactions
 of Acyl Nitroso Compounds in [4 + 2] Cycloadditions.
;
_journal_issue                   19
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              9518
_journal_page_last               9534
_journal_paper_doi               10.1021/acs.joc.5b01470
_journal_volume                  80
_journal_year                    2015
_chemical_formula_moiety         'C6 H6 N2 O2,H2 O'
_chemical_formula_sum            'C6 H8 N2 O3'
_chemical_formula_weight         156.14
_chemical_name_systematic
;
 2-Pyridinehydroxamic acid 
;
_space_group_crystal_system      monoclinic
_space_group_IT_number           15
_space_group_name_Hall           '-C 2yc'
_space_group_name_H-M_alt        'C 1 2/c 1'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     direct
_audit_creation_date             2014-02-01
_audit_creation_method
;
Olex2 1.2-alpha
(compiled 2014.01.22 svn.r2872 for OlexSys, GUI svn.r4747)
;
_cell_angle_alpha                90
_cell_angle_beta                 100.066(4)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   18.6391(16)
_cell_length_b                   3.7176(3)
_cell_length_c                   20.3890(16)
_cell_measurement_reflns_used    1223
_cell_measurement_temperature    120
_cell_measurement_theta_max      27.238
_cell_measurement_theta_min      2.22
_cell_volume                     1391.1(2)
_computing_cell_refinement       'SAINT v7.46A (Bruker, 2008)'
_computing_data_collection       'SMART v5.630 (Bruker, 2003)'
_computing_data_reduction        'SAINT v7.46A (Bruker, 2008)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL-2012 (Sheldrick, 2008)'
_computing_structure_solution    'XS (Sheldrick, 2008)'
_diffrn_ambient_temperature      120
_diffrn_detector                 'CCD area detector'
_diffrn_detector_area_resol_mean 5.6
_diffrn_detector_type            'Bruker SMART CCD 6000 area detector'
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device       'three-circle diffractometer'
_diffrn_measurement_device_type  'Bruker SMART CCD 6000 area detector'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.058
_diffrn_reflns_av_unetI/netI     0.0747
_diffrn_reflns_Laue_measured_fraction_full 0.996
_diffrn_reflns_Laue_measured_fraction_max 0.995
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       4
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            24925
_diffrn_reflns_point_group_measured_fraction_full 0.996
_diffrn_reflns_point_group_measured_fraction_max 0.995
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.562
_diffrn_reflns_theta_min         2.029
_diffrn_source                   'sealed X-ray tube'
_diffrn_source_current           35.0
_diffrn_source_power             1.75
_diffrn_source_target            Mo
_diffrn_source_voltage           50.0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.121
_exptl_absorpt_correction_T_max  1
_exptl_absorpt_correction_T_min  0.7501
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 TWINABS-2012/1 (Bruker,2012) was used for absorption correction.
 
For component 1:
 wR2(int) was 0.0657 before and 0.0454 after correction.
 The Ratio of minimum to maximum transmission not present.
 The \l/2 correction factor is Not present
 
For component 2:
 wR2(int) was 0.1217 before and 0.0474 after correction.
 The Ratio of minimum to maximum transmission is 0.75.
 The \l/2 correction factor is Not present

Final HKLF 4 output contains 24871 reflections, Rint = 0.0584
 (5600 with I > 3sig(I), Rint = 0.0440)
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.491
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       blade
_exptl_crystal_F_000             656
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.1
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.391
_refine_diff_density_min         -0.319
_refine_diff_density_rms         0.070
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     116
_refine_ls_number_reflns         1593
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0704
_refine_ls_R_factor_gt           0.0552
_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^)+(0.0742P)^2^+0.8518P]
 where P=(Fo^2^+2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1451
_refine_ls_wR_factor_ref         0.1593
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1287
_reflns_number_total             1593
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo5b01470_si_002.cif
_cod_data_source_block           9
_cod_database_code               4036303
_shelxl_version_number           2013-2
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All N(H) groups
2.a Aromatic/amide H refined with riding coordinates:
 C3(H3), C4(H4), C5(H5), C6(H6)
;