1973
DOI: 10.1039/p29730002101
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Crystal structure analysis and strain-energy minimization calculations on a sterically crowded molecule: 1,8-dimethylnaphthalene

Abstract: The crystal structure of 1.8-dimethylnaphthalene has been solved by a reciprocal space-search method. Leastsquares refinement of 914 independent X-ray reflections measured on a diffractometer leads to R 0.080. The molecular distortions caused by steric interaction of the methyl groups have been analysed by means of strainenergy minimization calculations, which show that the repulsive energy between the methyl groups is reduced mainly by bond-angle distortion a t the junction between the methyl groups and the n… Show more

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Cited by 42 publications
(24 citation statements)
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“…Finally, we find no evidence that peri strain between C(1) and C(8) substituents is transmitted to H(4) and H(5) by a buttressing mechanism involving H(2), H(3), H(6) and H(7) (Bright, Maxwell & de Boer, 1973). Were this the case, then one would expect to find systematic distortions of the bond angles involving these latter four atoms.…”
mentioning
confidence: 55%
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“…Finally, we find no evidence that peri strain between C(1) and C(8) substituents is transmitted to H(4) and H(5) by a buttressing mechanism involving H(2), H(3), H(6) and H(7) (Bright, Maxwell & de Boer, 1973). Were this the case, then one would expect to find systematic distortions of the bond angles involving these latter four atoms.…”
mentioning
confidence: 55%
“…The molecular geometry ( Fig. 1) is not significantly different from that of the parent hydrocarbon (Bright, Maxwell & de Boer, 1973) and manifestations ofperi strain are obvious. (16) is an opposed linear motion along the C (11)... C (16) vector; this is clearly unreasonable and in reality we are forced to consider the next best alternative.…”
mentioning
confidence: 99%
“…As observed in other peri or 1,8-disubstituted structures (Balasubramaniyan, 1966;Einspahr, Robert, Marsh & Roberts, 1973;Bright, Maxwell & de Boer, 1973;Robert, Sherfinski, Marsh & Roberts, 1974) the average lengths of the bonds involving the C(1) and C(8) atoms are longer than the average length of the bonds involving the C(4) and C (5) (Cody & Hazel, 1976, 1977 and other naphthalene derivatives (Robert, Sherfinski, Marsh & Roberts, 1974). * A torsion angle a-fl-7-c5 is positive if, when viewed down the fl-y bond, thea-fl bond will eclipse the y-g bond when rotated less than 180 ° in a clockwise direction (Klyne & Prelog, 1960).…”
Section: Naphthalene Geometrymentioning
confidence: 96%
“…1.514 (3) C (8) (3) 1.80 (3) 166 (2) 165 (2) 1.84 (3) 1.78 (3) 170 (2) 170 ( References: (a) Fitzgerald, Gallucci & Gerkin (1991); (b) Einspahr, Robert, Marsh & Roberts (1973); (c) Cosmo, Hambley & Sternhell (1990); (d) Bright, Maxwell & deBoer (1973). * Values equal by symmetry.…”
Section: Selected Interatomic Distances (/K) C---o--h Angles (°) Anmentioning
confidence: 99%