Familiarity with the normal CT appearance of the distal thoracic duct can be helpful in differentiating a normal duct from pathologic lesions of the lower neck, such as lymphadenopathy.
H and 13C NMR studies were carried out on the substituted dihydronaphthalene compounds 1,2dibydro-8isopropyl-6,7dimethoxy-%rnethylnaphthalene, ~b r o m o -1 ,~h y d r o -~~s o p r o p y l -6 , 7 d i m e t h o x y -~m e t h y l~~t~lene,3,4-dihy~o-5-isopropyl-6,7-dimethoxy-~methyl-l(2~naphthalenone, 1,2dihydro-6,7-dimethoxy-Z,8dimethylnaphthalene, 3-bromo-1,2dihydro-6,7dimethoxy-2,gdim and 3,4-dihydro-6,7dimethoxy-3,5dimethyl-l(2N)-naphthalenone. Complete assignments of the proton and carbon spectra were made using one-and two-dimensional NMR techniques including APT, COSY, NOESY and 1H-'3C HETCOR spectroscopy.
Vicml 3JHH coupling were investigated for a series of substituted dihydronaphthalenes allowing the conformation of the non-aromatic ring to be evaluated. It was found that the substitution of bromine for hydrogen increases the total puckering amplitude of the non-aromatic ring. Different formulations of the Karplw equation were investigated and the influence on the observed results are discussed.
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