#------------------------------------------------------------------------------ #$Date: 2011-09-10 05:16:28 +0200 (Sat, 10 Sep 2011) $ #$Revision: 25271 $ #$URL: svn://www.crystallography.net/cod/cif/2/2008217.cif $ #------------------------------------------------------------------------------ # # This file is available in the Crystallography Open Database (COD), # http://www.crystallography.net/. The original data for this entry # were provided by IUCr Journals, http://journals.iucr.org/. # # The file may be used within the scientific community so long as # proper attribution is given to the journal article from which the # data were obtained. # data_2008217 loop_ _publ_author_name 'Foces-Foces, C.' 'Llamas-Saiz, A. L.' 'Alajar\'in, M.' 'L\'opez-L\'azaro, A.' 'Molina, P.' _publ_section_title ; Two C~3~-symmetrical tris(ortho-substituted) tribenzylamines ; _journal_issue 3 _journal_name_full 'Acta Crystallographica Section C' _journal_page_first 373 _journal_page_last 377 _journal_volume 55 _journal_year 1999 _chemical_formula_moiety 'C40 H66 N4 O9 P3 +. BF4 - ' _chemical_formula_sum 'C40 H66 B F4 N4 O9 P3' _chemical_formula_weight 926.708 _chemical_melting_point .499E-305 _chemical_name_systematic 'N-Methyl-N,N,N-tris[2-(triethoxyphosphoranylideneamino)benzyl] ammonium' _space_group_IT_number 146 _symmetry_cell_setting trigonal _symmetry_space_group_name_Hall 'R 3' _symmetry_space_group_name_H-M 'R 3 :H' _audit_creation_method from_xtal_archive_file_using_CIFIO _cell_angle_alpha 90. _cell_angle_beta 90. _cell_angle_gamma 120. _cell_formula_units_Z 3 _cell_length_a 18.1459(6) _cell_length_b 18.1459(6) _cell_length_c 12.2532(5) _cell_measurement_reflns_used 65 _cell_measurement_temperature 150 _cell_measurement_theta_max 45 _cell_measurement_theta_min 2 _cell_volume 3494.1(2) _computing_cell_refinement 'LSUCRE (Appleman, 1971)' _computing_data_collection 'Philips PW1100 (Hornstra & Vossers, 1973)' _computing_data_reduction 'xtal (Hall et al., 1992) DIFDAT SORTRF ADDREF' _computing_molecular_graphics xtal_ORTEP _computing_publication_material xtal_BONDLA_CIFIO _computing_structure_refinement 'xtal CRYLSQ' _computing_structure_solution 'SIR92 (Altomare et al., 1994)' _diffrn_ambient_temperature 150 _diffrn_measurement_device 'Philips PW1100 diffractometer' _diffrn_measurement_method '\w/2\q scans' _diffrn_radiation_monochromator graphite _diffrn_radiation_source xray_tube _diffrn_radiation_type 'Cu K\a' _diffrn_radiation_wavelength 1.5418 _diffrn_reflns_av_R_equivalents .018 _diffrn_reflns_av_sigmaI/netI .008 _diffrn_reflns_limit_h_max 18 _diffrn_reflns_limit_h_min -18 _diffrn_reflns_limit_k_max 18 _diffrn_reflns_limit_k_min -18 _diffrn_reflns_limit_l_max 14 _diffrn_reflns_limit_l_min -14 _diffrn_reflns_number 2886 _diffrn_reflns_reduction_process perpendicular_monochr_Lp _diffrn_reflns_theta_max 65.12 _diffrn_reflns_theta_min 4.58 _diffrn_standards_decay_% 0 _diffrn_standards_interval_time 90 _diffrn_standards_number 2 _exptl_absorpt_coefficient_mu 1.781 _exptl_absorpt_correction_T_max 0.556 _exptl_absorpt_correction_T_min 0.483 _exptl_absorpt_correction_type psi-scan _exptl_absorpt_process_details '(North et al., 1968)' _exptl_crystal_colour colourless _exptl_crystal_density_diffrn 1.321 _exptl_crystal_density_method 'not measured' _exptl_crystal_description Prism _exptl_crystal_F_000 1476 _exptl_crystal_size_max 0.50 _exptl_crystal_size_mid 0.33 _exptl_crystal_size_min 0.33 _refine_diff_density_max .50 _refine_diff_density_min -.26 _refine_ls_abs_structure_details 'Flack (1983)' _refine_ls_abs_structure_Flack 0.02(4) _refine_ls_extinction_coef '4.8(6) x 10^2^' _refine_ls_extinction_method 'Zachariasen (1967)' _refine_ls_goodness_of_fit_all 1.518 _refine_ls_goodness_of_fit_ref 1.517 _refine_ls_hydrogen_treatment noref _refine_ls_matrix_type full _refine_ls_number_constraints 0 _refine_ls_number_parameters 185 _refine_ls_number_reflns 1298 _refine_ls_number_restraints 0 _refine_ls_R_factor_all .042 _refine_ls_R_factor_obs .042 _refine_ls_shift/su_max .047 _refine_ls_shift/su_mean .002 _refine_ls_structure_factor_coef F _refine_ls_weighting_scheme 'w = k/[(A+B Fo)^2^(C+D(sin\q)/\l)]' _refine_ls_wR_factor_all .048 _refine_ls_wR_factor_obs .048 _reflns_number_observed 1298 _reflns_number_total 1307 _reflns_observed_criterion refl_observed_if_I____>2.000_sigma(I___) _[local]_cod_data_source_file bm1283.cif _[local]_cod_data_source_block II _[local]_cod_cif_authors_sg_H-M 'R 3' _cod_original_cell_volume 3494.1(3) _cod_database_code 2008217 loop_ _symmetry_equiv_pos_as_xyz +x,+y,+z -y,+x-y,+z -x+y,-x,+z 2/3+x,1/3+y,1/3+z 1/3+x,2/3+y,2/3+z 2/3-y,1/3+x-y,1/3+z 1/3-y,2/3+x-y,2/3+z 2/3-x+y,1/3-x,1/3+z 1/3-x+y,2/3-x,2/3+z loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 N1 .0261(16) .0261(16) .025(2) .0130(8) .00000 .00000 C2 .0313(19) .0313(19) .024(3) .0156(9) .00000 .00000 C11 .0297(17) .0294(17) .0271(16) .0161(15) .0021(14) -.0019(13) C12 .0285(18) .0306(19) .0287(17) .0152(15) .0008(13) -.0018(14) C13 .0290(19) .0319(19) .0335(18) .0161(16) .0017(15) .0002(14) C14 .038(2) .034(2) .045(2) .0204(18) -.0012(17) .0024(17) C15 .043(2) .028(2) .057(3) .0170(18) .0016(19) .0002(17) C16 .038(2) .035(2) .049(2) .0156(18) -.0045(18) -.0127(18) C17 .035(2) .034(2) .0374(18) .0177(17) -.0063(16) -.0060(16) N18 .0338(17) .0309(17) .0298(16) .0165(14) -.0064(13) -0.0023(13) P1 .0340(5) .0390(6) .0307(5) .0197(5) -.0024(4) -.0004(4) O1 .0456(18) .0411(17) .0379(16) .0147(14) -.0092(13) -.0033(13) C3 .049(3) .047(3) .045(2) .007(2) -.015(2) .003(2) C4 .059(3) .056(3) .062(3) .006(3) -.021(3) -.002(3) O2 .0437(17) .0551(18) .0357(14) .0329(15) -.0019(12) .0022(13) C5 .070(4) .118(5) .046(3) .069(4) .004(2) .020(3) C6 .056(3) .091(4) .083(4) .047(3) -.023(3) -.021(3) O3 .0484(18) .062(2) .0335(15) .0319(16) .0055(13) .0030(13) C7 .058(3) .063(3) .065(3) .035(3) .021(3) .004(3) C8 .058(4) .070(4) .111(5) .031(3) .028(4) .015(4) F2 .071(2) .071(2) .028(2) .0354(10) .00000 .00000 B1 .046(3) .046(3) .026(3) .0232(14) .00000 .00000 F1 .088(2) .068(2) .063(2) .0471(19) -.0053(16) .0133(16) F2 .071(2) .071(2) .028(2) .0354(10) .00000 .00000 loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv _atom_site_thermal_displace_type N1 .66670 .33330 .94730 .0257(18) Uani C2 .66670 .33330 .8259(6) .029(2) Uani C11 .6203(2) .3784(2) .9912(5) .0281(14) Uani C12 .6584(2) .4706(2) .9604(5) .0291(15) Uani C13 .6280(2) .4941(2) .8689(5) .0311(15) Uani C14 .6623(3) .5815(3) .8478(5) .0384(18) Uani C15 .7214(3) .6427(3) .9176(6) .043(2) Uani C16 .7483(3) .6191(3) 1.0101(6) .042(2) Uani C17 .7162(3) .5334(3) 1.0311(5) .0353(16) Uani N18 .5657(2) .4297(2) .8055(5) .0314(14) Uani P1 .51307(6) .43279(6) .7090(4) .0339(4) Uani O1 .4422(2) .3400(2) .6788(5) .0446(14) Uani C3 .3918(3) .2820(3) .7671(6) .055(2) Uani C4 .3130(4) .2103(4) .7168(7) .069(3) Uani O2 .4694(2) .4866(2) .7318(5) .0412(14) Uani C5 .4151(4) .4969(5) .6528(6) .068(3) Uani C6 .3228(4) .4370(5) .6810(7) .072(3) Uani O3 .5575(2) .4689(2) .5964(5) .0461(15) Uani C7 .6195(4) .4481(4) .5532(6) .060(3) Uani C8 .7063(4) .5134(5) .5803(8) .080(4) Uani B1 .66660 .33330 .3028(7) .040(3) Uani F1 .6542(3) .3979(2) .2645(5) .0697(18) Uani F2 .66660 .33330 .4142(5) .057(2) Uani H2a .71371 .38321 .80754 .02890 Uiso H3a .42332 .26060 .80198 .04700 Uiso H3b .37679 .31089 .81828 .04700 Uiso H5a .42672 .48289 .57451 .07800 Uiso H5b .42664 .55919 .65469 .07800 Uiso H4a .31862 .18503 .66636 .05870 Uiso H4b .28197 .23895 .70802 .05870 Uiso H4c .28291 .17123 .77875 .05870 Uiso H6a .29194 .46170 .65282 .07670 Uiso H6b .31954 .43527 .75755 .07670 Uiso H6c .29505 .38167 .65834 .07670 Uiso H7a .61401 .44285 .46894 .06190 Uiso H7b .60810 .39072 .58662 .06190 Uiso H8a .71450 .53040 .65830 .07980 Uiso H8b .70990 .55840 .53730 .07980 Uiso H8c .75190 .50070 .56240 .07980 Uiso H11a .61355 .37070 1.06154 .02860 Uiso H11b .56247 .34673 .95865 .02860 Uiso H14 .63659 .59140 .78902 .03940 Uiso H15 .73973 .69671 .88502 .04210 Uiso H16 .77769 .65752 1.05505 .04080 Uiso H17 .73681 .51736 1.08380 .03560 Uiso loop_ _atom_type_symbol _atom_type_scat_dispersion_real _atom_type_scat_dispersion_imag _atom_type_scat_source C .017 .009 'International Tables for X-Ray Crystallography (1974)' H 0 0 'International Tables for X-Ray Crystallography (1974)' N .029 .018 'International Tables for X-Ray Crystallography (1974)' O .047 .032 'International Tables for X-Ray Crystallography (1974)' P .283 .434 'International Tables for X-Ray Crystallography (1974)' B .008 .004 'International Tables for X-Ray Crystallography (1974)' F .069 .053 'International Tables for X-Ray Crystallography (1974)' loop_ _diffrn_standard_refln_index_h _diffrn_standard_refln_index_k _diffrn_standard_refln_index_l -3 0 3 3 0 -3 loop_ _geom_angle_atom_site_label_1 _geom_angle_atom_site_label_2 _geom_angle_atom_site_label_3 _geom_angle_site_symmetry_1 _geom_angle_site_symmetry_3 _geom_angle _geom_angle_publ_flag C2 N1 C11 . 2_655 110.5(2) ? C2 N1 C11 . 3_665 110.5(2) ? C2 N1 C11 . . 110.5(2) yes C11 N1 C11 2_655 3_665 108.5(3) ? C11 N1 C11 2_655 . 108.4(3) yes C11 N1 C11 3_665 . 108.4(3) ? H2a C2 H2a 3_665 . 114.2(4) ? H2a C2 H2a 3_665 2_655 114.1(4) ? H2a C2 N1 3_665 . 104.4(5) ? H2a C2 H2a . 2_655 114.0(4) ? H2a C2 N1 . . 104.3(5) ? H2a C2 N1 2_655 . 104.3(5) ? H11a C11 H11b . . 106.3(4) ? H11a C11 C12 . . 112.1(5) ? H11a C11 N1 . . 109.3(4) ? H11b C11 C12 . . 107.9(5) ? H11b C11 N1 . . 104.7(4) ? C12 C11 N1 . . 115.8(3) ? C17 C12 C13 . . 119.7(4) ? C17 C12 C11 . . 119.4(5) yes C13 C12 C11 . . 120.4(4) ? N18 C13 C12 . . 118.0(4) yes N18 C13 C14 . . 124.0(5) yes C12 C13 C14 . . 118.0(4) yes H14 C14 C15 . . 126.1(5) ? H14 C14 C13 . . 112.4(4) ? C15 C14 C13 . . 121.1(6) ? H15 C15 C16 . . 131.8(5) ? H15 C15 C14 . . 107.3(6) ? C16 C15 C14 . . 120.6(5) ? H16 C16 C15 . . 117.3(6) ? H16 C16 C17 . . 123.2(7) ? C15 C16 C17 . . 118.9(5) ? H17 C17 C16 . . 120.4(5) ? H17 C17 C12 . . 117.5(5) ? C16 C17 C12 . . 121.5(6) ? C13 N18 P1 . . 131.3(4) ? N18 P1 O2 . . 113.8(4) yes N18 P1 O3 . . 119.5(2) yes N18 P1 O1 . . 109.5(3) yes O2 P1 O3 . . 102.3(3) ? O2 P1 O1 . . 108.3(2) ? O3 P1 O1 . . 102.5(4) ? C3 O1 P1 . . 118.6(5) ? H3a C3 H3b . . 109.5(7) ? H3a C3 O1 . . 110.0(5) ? H3a C3 C4 . . 109.9(6) ? H3b C3 O1 . . 110.0(5) ? H3b C3 C4 . . 110.0(6) ? O1 C3 C4 . . 107.5(6) ? H4a C4 H4b . . 120.4(9) ? H4a C4 H4c . . 111.1(8) ? H4a C4 C3 . . 118.1(7) ? H4b C4 H4c . . 102.3(7) ? H4b C4 C3 . . 98.1(6) ? H4c C4 C3 . . 104.4(6) ? C5 O2 P1 . . 123.3(5) ? H5a C5 H5b . . 109.3(7) ? H5a C5 O2 . . 110.4(8) ? H5a C5 C6 . . 108.8(6) ? H5b C5 O2 . . 110.0(5) ? H5b C5 C6 . . 108.9(8) ? O2 C5 C6 . . 109.4(6) ? H6c C6 H6b . . 106.1(8) ? H6c C6 H6a . . 106.3(7) ? H6c C6 C5 . . 121.6(9) ? H6b C6 H6a . . 109.9(10) ? H6b C6 C5 . . 106.3(6) ? H6a C6 C5 . . 106.4(7) ? C7 O3 P1 . . 121.1(5) ? H7a C7 H7b . . 109.7(6) ? H7a C7 O3 . . 109.7(7) ? H7a C7 C8 . . 108.4(6) ? H7b C7 O3 . . 108.9(5) ? H7b C7 C8 . . 108.5(7) ? O3 C7 C8 . . 111.6(6) ? H8b C8 H8c . . 111.9(8) ? H8b C8 H8a . . 109.5(9) ? H8b C8 C7 . . 99.0(8) ? H8c C8 H8a . . 105.8(9) ? H8c C8 C7 . . 116.8(8) ? H8a C8 C7 . . 113.9(7) ? F2 B1 F1 . 2_655 109.9(4) ? F2 B1 F1 . . 109.9(4) ? F2 B1 F1 . 3_665 109.8(4) ? F1 B1 F1 2_655 . 109.1(5) ? F1 B1 F1 2_655 3_665 109.1(5) ? loop_ _geom_bond_atom_site_label_1 _geom_bond_atom_site_label_2 _geom_bond_site_symmetry_2 _geom_bond_distance _geom_bond_publ_flag N1 C2 . 1.488(8) yes N1 C11 2_655 1.534(7) ? N1 C11 3_665 1.534(7) ? N1 C11 . 1.535(5) yes C2 H2a 3_665 .908(2) ? C2 H2a . .909(2) ? C2 H2a 2_655 .910(2) ? C11 H11a . .872(6) ? C11 H11b . .993(4) ? C11 C12 . 1.505(6) ? C12 C17 . 1.398(6) ? C12 C13 . 1.405(8) ? C13 N18 . 1.388(6) yes C13 C14 . 1.408(6) ? C14 H14 . .923(6) ? C14 C15 . 1.387(7) ? C15 H15 . .952(5) ? C15 C16 . 1.383(10) ? C16 H16 . .837(5) ? C16 C17 . 1.385(7) ? C17 H17 . .867(6) ? N18 P1 . 1.538(7) yes P1 O2 . 1.560(5) yes P1 O3 . 1.566(7) yes P1 O1 . 1.568(3) yes O1 C3 . 1.468(8) ? C3 H3a . .940(8) ? C3 H3b . .940(7) ? C3 C4 . 1.503(8) ? C4 H4a . .805(8) ? C4 H4b . .945(9) ? C4 H4c . .995(7) ? O2 C5 . 1.458(10) ? C5 H5a . 1.040(8) ? C5 H5b . 1.042(10) ? C5 C6 . 1.513(9) ? C6 H6c . .912(8) ? C6 H6b . .939(9) ? C6 H6a . .941(10) ? O3 C7 . 1.452(9) ? C7 H7a . 1.037(8) ? C7 H7b . 1.040(7) ? C7 C8 . 1.458(8) ? C8 H8b . .945(10) ? C8 H8c . .989(10) ? C8 H8a . .993(10) ? F2 B1 . 1.364(11) ? B1 F1 2_655 1.381(7) ? B1 F1 . 1.382(6) ? B1 F1 3_665 1.383(10) ? loop_ _geom_hbond_atom_site_label_D _geom_hbond_atom_site_label_H _geom_hbond_atom_site_label_A _geom_hbond_site_symmetry_A _geom_hbond_distance_DH _geom_hbond_distance_HA _geom_hbond_distance_DA _geom_hbond_angle_DHA _geom_hbond_publ_flag C3 H3a C12-17 2_655 0.94 3.04 3.903(8) 154 yes loop_ _geom_torsion_atom_site_label_1 _geom_torsion_atom_site_label_2 _geom_torsion_atom_site_label_3 _geom_torsion_atom_site_label_4 _geom_torsion_site_symmetry_1 _geom_torsion_site_symmetry_4 _geom_torsion _geom_torsion_publ_flag C11 N1 C2 H2a . . 87.52(12) ? C11 N1 C2 H2a . 2_655 -32.38(12) ? C11 N1 C2 H2a . 3_665 -152.39(12) ? C11 N1 C2 H2a 2_655 . -152.5(2) ? C11 N1 C2 H2a 2_655 2_655 87.6(2) ? C11 N1 C2 H2a 2_655 3_665 -32.4(2) ? C11 N1 C2 H2a 3_665 . -32.4(2) ? C11 N1 C2 H2a 3_665 2_655 -152.3(2) ? C11 N1 C2 H2a 3_665 3_665 87.7(2) ? C2 N1 C11 C12 . . -61.4(4) yes C2 N1 C11 H11a . . 170.8(2) ? C2 N1 C11 H11b . . 57.3(4) ? C11 N1 C11 C12 2_655 . 177.3(4) ? C11 N1 C11 H11a 2_655 . 49.6(4) ? C11 N1 C11 H11b 2_655 . -64.0(4) ? C11 N1 C11 C12 3_665 . 59.8(5) yes C11 N1 C11 H11a 3_665 . -67.9(3) ? C11 N1 C11 H11b 3_665 . 178.5(3) ? N1 C11 C12 C13 . . 94.8(5) yes N1 C11 C12 C17 . . -93.6(6) ? H11a C11 C12 C13 . . -138.8(5) ? H11a C11 C12 C17 . . 32.8(7) ? H11b C11 C12 C13 . . -22.1(7) ? H11b C11 C12 C17 . . 149.5(5) ? C11 C12 C13 C14 . . 176.1(5) ? C11 C12 C13 N18 . . -3.4(8) yes C17 C12 C13 C14 . . 4.5(8) ? C17 C12 C13 N18 . . -175.0(5) ? C11 C12 C17 C16 . . -175.3(5) ? C11 C12 C17 H17 . . 13.0(8) ? C13 C12 C17 C16 . . -3.6(8) ? C13 C12 C17 H17 . . -175.3(5) ? C12 C13 C14 C15 . . -2.7(8) ? C12 C13 C14 H14 . . -176.4(5) ? N18 C13 C14 C15 . . 176.7(6) ? N18 C13 C14 H14 . . 3.1(9) ? C12 C13 N18 P1 . . 173.0(5) ? C14 C13 N18 P1 . . -6.5(9) yes C13 C14 C15 C16 . . .0(9) ? C13 C14 C15 H15 . . 174.9(5) ? H14 C14 C15 C16 . . 172.7(6) ? H14 C14 C15 H15 . . -12.4(10) ? C14 C15 C16 C17 . . 1.0(9) ? C14 C15 C16 H16 . . -170.1(6) ? H15 C15 C16 C17 . . -172.4(7) ? H15 C15 C16 H16 . . 16.4(12) ? C15 C16 C17 C12 . . .8(9) ? C15 C16 C17 H17 . . 172.3(6) ? H16 C16 C17 C12 . . 171.4(6) ? H16 C16 C17 H17 . . -17.1(11) ? C13 N18 P1 O1 . . -171.7(5) yes C13 N18 P1 O2 . . -50.4(6) yes C13 N18 P1 O3 . . 70.7(7) yes N18 P1 O1 C3 . . 45.8(5) ? O2 P1 O1 C3 . . -78.8(6) ? O3 P1 O1 C3 . . 173.7(5) ? N18 P1 O2 C5 . . -178.7(4) ? O1 P1 O2 C5 . . -56.8(5) ? O3 P1 O2 C5 . . 50.9(4) ? N18 P1 O3 C7 . . 41.5(5) ? O1 P1 O3 C7 . . -79.7(4) ? O2 P1 O3 C7 . . 168.2(4) ? P1 O1 C3 C4 . . 162.2(5) ? P1 O1 C3 H3a . . -78.2(7) ? P1 O1 C3 H3b . . 42.5(7) ? O1 C3 C4 H4a . . 52.7(11) ? O1 C3 C4 H4b . . -78.3(7) ? O1 C3 C4 H4c . . 176.7(6) ? H3a C3 C4 H4a . . -67.0(11) ? H3a C3 C4 H4b . . 162.0(7) ? H3a C3 C4 H4c . . 57.0(9) ? H3b C3 C4 H4a . . 172.4(8) ? H3b C3 C4 H4b . . 41.4(8) ? H3b C3 C4 H4c . . -63.5(9) ? P1 O2 C5 C6 . . 99.9(7) ? P1 O2 C5 H5a . . -19.8(7) ? P1 O2 C5 H5b . . -140.5(5) ? O2 C5 C6 H6a . . 153.9(7) ? O2 C5 C6 H6b . . 36.8(11) ? O2 C5 C6 H6c . . -84.5(10) ? H5a C5 C6 H6a . . -85.5(10) ? H5a C5 C6 H6b . . 157.4(9) ? H5a C5 C6 H6c . . 36.2(14) ? H5b C5 C6 H6a . . 33.6(10) ? H5b C5 C6 H6b . . -83.5(10) ? H5b C5 C6 H6c . . 155.2(9) ? P1 O3 C7 C8 . . -95.1(6) ? P1 O3 C7 H7a . . 144.7(4) ? P1 O3 C7 H7b . . 24.6(7) ? O3 C7 C8 H8a . . 48.4(11) ? O3 C7 C8 H8b . . -67.7(9) ? O3 C7 C8 H8c . . 172.2(8) ? H7a C7 C8 H8a . . 169.2(8) ? H7a C7 C8 H8b . . 53.2(10) ? H7a C7 C8 H8c . . -67.0(11) ? H7b C7 C8 H8a . . -71.6(11) ? H7b C7 C8 H8b . . 172.3(8) ? H7b C7 C8 H8c . . 52.2(11) ?