Cascade synthesis of (E)-2-alkylidenecyclobutanols.
Falck, J. R.; Bandyopadhyay, Anish; Puli, Narender; Kundu, Abhijit; Reddy, L. Manmohan; Barma, Deb K.; He, Anyu; Zhang, Hongming; Kashinath, Dhurke; Baati, Rachid; Organic letters 11 (2009) 4764–4766; doi:10.1021/ol901985c

data_1504222
_publ_section_title
;
 Cascade synthesis of (E)-2-alkylidenecyclobutanols.
;
_journal_issue                   20
_journal_name_full               'Organic letters'
_journal_page_first              4764
_journal_page_last               4766
_journal_paper_doi               10.1021/ol901985c
_journal_volume                  11
_journal_year                    2009
_chemical_formula_moiety         'C20 H24 O2'
_chemical_formula_sum            'C20 H24 O2'
_chemical_formula_weight         296.39
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 110.607(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   14.0468(8)
_cell_length_b                   6.6546(4)
_cell_length_c                   18.8942(10)
_cell_measurement_reflns_used    6047
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      27.97
_cell_measurement_theta_min      2.23
_cell_volume                     1653.15(16)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      200(2)
_diffrn_detector_area_resol_mean 83.33
_diffrn_measured_fraction_theta_full 0.983
_diffrn_measured_fraction_theta_max 0.983
_diffrn_measurement_device_type  'Bruker APEX'
_diffrn_measurement_method       'phi and omega scans'
_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  0.030
_diffrn_reflns_av_sigmaI/netI    0.023
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            19412
_diffrn_reflns_theta_full        28.32
_diffrn_reflns_theta_max         28.32
_diffrn_reflns_theta_min         1.57
_exptl_absorpt_coefficient_mu    0.075
_exptl_absorpt_correction_T_max  0.989
_exptl_absorpt_correction_T_min  0.967
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, Bruker, 2003'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.191
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plates
_exptl_crystal_F_000             640
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.280
_refine_diff_density_min         -0.249
_refine_diff_density_rms         0.042
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.067
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     201
_refine_ls_number_reflns         4039
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.067
_refine_ls_R_factor_all          0.065
_refine_ls_R_factor_gt           0.053
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0697P)^2^+0.2875P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.130
_refine_ls_wR_factor_ref         0.136
_reflns_number_gt                3306
_reflns_number_total             4039
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol901985c_si_002.cif
_cod_data_source_block           swab2
_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 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               1504222