Pyromellitic dihydrazides as hydrolytically stable analogs of pyromellitic diimide.
Amundson, Journey M.; Brush, Ryan B.; Jensen, Kara M.; Funk, Baela R.; Jung, Healeam; Mamicha, Sam K.; Young, Jr, Victor G; Garcia L, Eryck; Klivansky, Liana M.; Cao, Dennis D.; Organic & biomolecular chemistry 24 (2026) 2650–2654; doi:10.1039/d6ob00281a

data_7161077
_publ_section_title
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 Pyromellitic dihydrazides as hydrolytically stable analogs of
 pyromellitic diimide.
;
_journal_issue                   13
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              2650
_journal_page_last               2654
_journal_paper_doi               10.1039/d6ob00281a
_journal_volume                  24
_journal_year                    2026
_chemical_formula_moiety         'C26 H38 N4 O4'
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_audit_update_record
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2026-01-07 deposited with the CCDC.	2026-03-12 downloaded from the CCDC.
;
_cell_angle_alpha                90
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_computing_cell_refinement       'Bruker SAINT'
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_diffrn_ambient_temperature      100(2)
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_diffrn_reflns_av_unetI/netI     0.0251
_diffrn_reflns_Laue_measured_fraction_full 0.999
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_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -18
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_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            17810
_diffrn_reflns_point_group_measured_fraction_full 0.999
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_diffrn_reflns_theta_full        25.242
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_diffrn_reflns_theta_min         2.260
_diffrn_source                   micro-focus
_exptl_absorpt_coefficient_mu    0.070
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.6373
_exptl_absorpt_correction_type   multi-scan
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_exptl_crystal_colour            yellow
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_exptl_crystal_description       block
_exptl_crystal_F_000             1016
_exptl_crystal_size_max          0.200
_exptl_crystal_size_mid          0.200
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_refine_diff_density_rms         0.047
_refine_ls_extinction_method     none
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_refine_ls_matrix_type           full
_refine_ls_number_parameters     156
_refine_ls_number_reflns         3494
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.037
_refine_ls_R_factor_all          0.0529
_refine_ls_R_factor_gt           0.0451
_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^)+(0.0651P)^2^+2.5212P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1235
_refine_ls_wR_factor_ref         0.1303
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2954
_reflns_number_total             3494
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d6ob00281a2.cif
_cod_data_source_block           25107zz
_cod_depositor_comments
'Adding full bibliography for 7161076--7161078.cif.'
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               7161077
_shelx_shelxl_version_number     2019/3
_shelx_estimated_absorpt_t_min   0.986
_shelx_estimated_absorpt_t_max   0.992
_exptl_absorpt_special_details
;
 Reference: Krause, L., Herbst-Irmer, R., Sheldrick G.M. & Stalke D.,
 J. Appl. Cryst. 48 (2015) 3-10.
;
_shelx_res_checksum              45789
_shelx_fab_checksum              10247