Crystal structure of 3-acetoxy-2-methylbenzoic acid

Abstract

In the title mol­ecule, C10H10O4, the carb­oxy­lic acid group is twisted by 11.37 (15)° from the plane of the benzene ring and the acet­oxy group is twisted from this plane by 86.60 (17)°. In the crystal, mol­ecules are linked by pairs of O—H⋯O hydrogen bonds, forming inversion dimers with the expected R 2 2(8) graph-set motif.

Cu(II) immobilized on Fe$_{3}$O$_{4}$@Agarose nanomagnetic catalyst functionalized with ethanolamine phosphate--salicylaldehyde Schiff base: a magnetically reusable nanocatalyst for preparation of 2-substituted imidazolines, oxazolines, and thiazolines

“…31 It is worth noting that the stretching vibration bands of P=O and O-P-O bonds were covered by the asymmetric stretching vibration bands of the C-O-C, bridge which caused a broad absorption band at 1153-1004 cm −1 . 32 The FT-IR spectrum of Fe 3 O 4 @Agarose/SAEPH 2 (III) (Figure 1c) showed an absorption band at 1564 cm −1 due to the C=N stretching vibration 33 and the relatively broad band corresponding to O-H stretching vibration mode at around 3596-3064 cm −1 , which confirmed the successful formation of Schiff base on the surface of functionalized Fe 3 O 4 @Agarose. In addition, coordination of Fe 3 O 4 @Agarose/SAEPH 2 to Cu(OAc) 2 .H 2 O (Figure 1d) was corroborated by the decrease in the intensities and frequencies of absorption bands of O-H and C=N bonds (3384, 1557 cm −1 due to stretching vibrations modes of O-H and C=N, respectively).…”

Reinvestigation of the crystal structure ofN-(4-chlorobenzylidene)-2-hydroxyaniline: a three-dimensional structure containing O—H...N, O—H...O and C—H...π(arene) hydrogen bonds

“…Hence any conclusions drawn from the deposited atomic coordinates may be untrustworthy. The structures of several positional isomers of (I) have been reported recently (Kazak et al, 2004;Sundararaman et al, 2007;Saranya et al, 2015) and in view of these reports and of the widespread applications of Schiff bases, we have accordingly now collected a new data set for compound (I), whose structure we report here ( Fig. 1).…”

“…4). In each of compounds (II) (Kazak et al, 2004) and (III) (Sundararaman et al, 2007), the molecules are linked by O-HÁ Á ÁN hydrogen bonds to form chains of the C(7) and C(8) types, respectively, while in compound (IV) (Saranya et al, 2015) the sole O-HÁ Á ÁN interaction is intramolecular. The bromo derivative (V) (Jiao et al, 2006) is isomorphous with the chloro analogue (I), but these two compounds are not strictly isostructural in that the structure of (V) contains only one C-HÁ Á Á(arene) hydrogen bond, as compared with two such bonds in the structure of (I).…”