The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 8-Bromooctan-1-ol( cas:50816-19-8 ) is researched.Synthetic Route of C8H17BrO.Reddy, Mandadhi Guruprasad; Lobo, Nitin P.; Ramanathan, Krishna V.; Narasimhaswamy, Tanneru published the article 《Molecular Order of Topologically Variant Flexible Mesogens by 13C Nuclear Magnetic Resonance》 about this compound( cas:50816-19-8 ) in Langmuir. Keywords: flexible mesogen nematic smectic phase mol order carbon NMR. Let’s learn more about this compound (cas:50816-19-8).
13C NMR investigations in the nematic phase of mesogens comprising a rod-like core with three Ph rings connected to a fourth Ph ring via a flexible spacer are reported. The mols. are abbreviated as monomer, dimer, and trimer as they comprised one, two, and three pairs of core and spacer combinations linked to ring IV, resp. Hot-stage optical polarizing microscopy and differential scanning calorimetry studies confirmed that all of them exhibit an enantiotropic nematic phase with addnl. monotropic or enantiotropic smectic mesophases. Large values of 13C-1H dipolar couplings of the order of 11 kHz are observed for all the cases for the terminal carbon C1 of the core unit. These high values indicated that the corresponding CH vector is collinear with the long axis of the mol., which itself is aligned parallel to the magnetic field. In contrast, the terminal carbon of the ring IV (C19/C17) exhibits a relatively smaller value in the range of 2.0-2.5 kHz, reflecting the divergent local dynamics at different sections of the mesogens. The orientational order parameters of the Ph rings computed from the 13C-1H dipolar couplings have been used to obtain the conformation of the mesogens in the nematic phase. It is concluded that the dimer and trimer exhibit C2 and C3 symmetry with the ring IV connected by spacers tilted away from the symmetry axis by 35.9 and 90° for the two cases, resp. This leads to the interesting tripod-like mol. shape for the trimer in the nematic phase rather than the planar representation of the λ shape.
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