1,8-Dibenzoyl-2,7-dimethylnaphthalene

Abstract

Abstract. C26H2002, Mr=364, monoclinic, P2Jn,

peri-Interactions in Naphthalenes, 4 [1]. Hypercoordination in 8-Dimethylamino-naphth-1-yl Phosphorus Compounds

“…270 [14,15] and 300 pm [13,15] being the most common. Whereas in "classical" hypercoor dination chemistry electronegative ligands attached 106 [87] to P/Si very much facilitate the formation of extra bonds, this is not a prerequisite in the DAN-phosphines/-silanes; in the series of DAN-silanes dative N^S i interaction is even claimed to be particu larly pronounced in hydrogeno-silanes not contain ing halogen [27]. In "classical" hypercoordination chemistry the step from tetra-to penta-coordination is usually taken more easily than that from pentato hexa-coordination, and the further steps to heptaand octa-coordination not at all.…”

peri-Interactions in Naphthalenes, 12 [1]. The Significance of Linear and T-Shaped Arrangements in peri-Substituted Naphthalenes

“…In 1,8-disubstituted naphthalenes with intersubstituent repulsion, hence positive splay angles, the average of the angles C(3)-C(4)-C(10), C(4)-C(10)-C(5) and C(6)-C(5)-C(10) is consistently ca. 1 − 2 • smaller than that of the angles C(2)-C(1)-C(9), C(1)-C(9)-C(8) and C(7)-C(8)-C(9) though not smaller than 120 • [45,65], thus indicating ring flattening in addition to splaying to reduce steric repulsion. selenium derivatives of naphthalene [7,8] and anthracene [10].…”

“…g Although in 14a this average angle exceeds 120 • only slightly, the increase is presumably significant. The positive splay angles in the upper parts of 11, 12 and 14a trigger a compression of bond angles in the lower parts [4,45,53,65], which counteracts the enlargement due to the flattening. In 1,8-disubstituted naphthalenes with intersubstituent repulsion, hence positive splay angles, the average of the angles C(3)-C(4)-C(10), C(4)-C(10)-C(5) and C(6)-C(5)-C(10) is consistently ca.…”

Dative N→P/Si Interactions — A Historical Approach [1]

“…The splay angle of the peri-bonds is the sum of these three angles minus 360°. In 1980, Gore and Henrick [46] again emphasized the importance of the inner bay angle. Again it is a fact that it is the "inner" angle, C(1)-C(9)-C(8), which usually carries the main burden.…”