Ring expansion/homologation–aldehyde condensation cascade using tert-trihalomethylcarbinols.
Falck, J. R.; He, Anyu; Reddy, L. Manmohan; Kundu, Abhijit; Barma, Deb K.; Bandyopadhyay, A.; Kamila, Sukanta; Akella, Radha; Bejot, Romain; Mioskowski, Charles; Organic letters 8 (2006) 4645–4647; doi:10.1021/ol061953q

data_1506231
_publ_section_title
;
 Ring expansion/homologation--aldehyde condensation cascade using
 tert-trihalomethylcarbinols.
;
_journal_issue                   20
_journal_name_full               'Organic letters'
_journal_page_first              4645
_journal_page_last               4647
_journal_paper_doi               10.1021/ol061953q
_journal_volume                  8
_journal_year                    2006
_chemical_formula_sum            'C20 H20 O'
_chemical_formula_weight         276.34
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.000
_cell_angle_beta                 101.766(15)
_cell_angle_gamma                90.000
_cell_formula_units_Z            2
_cell_length_a                   6.951(3)
_cell_length_b                   7.903(4)
_cell_length_c                   14.659(4)
_cell_measurement_temperature    291(2)
_cell_volume                     788.4(6)
_computing_cell_refinement       'HKL2000 v095.373'
_computing_data_collection       'collect, Nonius 1999'
_computing_data_reduction        'HKL2000 v095.373'
_computing_publication_material  'XCIF (Sheldrick and Bruker 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      291(2)
_diffrn_measured_fraction_theta_full 0.847
_diffrn_measured_fraction_theta_max 0.847
_diffrn_measurement_device_type  'KAPPA CCD'
_diffrn_measurement_method       Collect
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0993
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            1258
_diffrn_reflns_theta_full        23.97
_diffrn_reflns_theta_max         23.97
_diffrn_reflns_theta_min         1.42
_exptl_absorpt_coefficient_mu    0.069
_exptl_absorpt_correction_type   none
_exptl_absorpt_process_details   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.156
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needles
_exptl_crystal_F_000             292
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.167
_refine_diff_density_min         -0.185
_refine_diff_density_rms         0.049
_refine_ls_extinction_coef       2.4(5)
_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_ref   0.969
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     191
_refine_ls_number_reflns         1258
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.968
_refine_ls_R_factor_all          0.1171
_refine_ls_R_factor_gt           0.0839
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.2000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2011
_refine_ls_wR_factor_ref         0.2493
_reflns_number_gt                797
_reflns_number_total             1258
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol061953qsi20060807_045002.cif
_cod_data_source_block           shelxl_23
_cod_original_sg_symbol_H-M      'p 21'
_cod_database_code               1506231