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- W2000468058 abstract "The structure of the title compound 3, C 39 H 32 , obtained for the first time by Schlenk and Bornhardt (1912) from triphenylmethyl (1) and diazomethane (2) has been determined by 14 C-tracer technique, NMR spectroscopy and X-ray analysis. It crystallizes in the monoclinic space group C2/c with Z = 4, a = 9.943(6), b= 19.054(3), c = 14.708(2) Å and β = 101.80(2)°. The structure was solved by direct methods and refined by full-matrix least squares to R = 0.046 for all 2625 reflexions (|F 0 | >0). On account of steric repulsions between the phenyl rings at both termini the central propane bond angle φ is stretched to 127.2°, whereas the bond lengths are not much affected. The X-ray results are compared with those of Blount et al. (1982), obtained on a triclinic crystal modification (P1) of 3. A fair agreement of bond lengths and angles is observed, the slopes of the homochiral propellers, however, aro different in both modifications. The measurement of the N2- evolution shows that the mechanism of formation of 3 from 1 and 2 is different in the photochemical and dark reaction. A carbene respectively a one-electron transfer mechanism is suggested. In spite of the remarkably normal CC-propane bond lengths homolytic cleavage of these bonds to give 1 is observed at 200-220 °C using the ESR technique" @default.
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- W2000468058 date "1982-12-01" @default.
- W2000468058 modified "2023-10-12" @default.
- W2000468058 title "Sterically Hindered Alkanes, II 1,1,1,3,3,3-Hexaphenylpropane" @default.
- W2000468058 doi "https://doi.org/10.1515/znb-1982-1226" @default.
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