The Structure of Hydrazones

Abstract

The review surveys the present state of research on the conformation, isomerism, and intramolecular interactions of molecules of the immense class of organic compounds containing a hydrazone group. A list of 221 references is included. CONTENTS 442Russian Chemical Reviews, 39 (6), 1970 convenience we shall henceforward term the nitrogen atom in the azomethine group the imine nitrogen, and the other atom the amine nitrogen.The triatomic hydrazone group is characteristic of a large number of organic compounds of the typewhere R, R', X, and Υ can vary widely. We will use the term "hydrazones" as a general name for compounds having the structure (Π). When R' = Υ = Η we have "unsubstituted hydrazones"; when R' = Alk(Ar, Az) and Υ = H, "alkyKaryl, acyl)hydrazones", and when R' = Alk (Ar, Alk, Alk) and Υ = Alk(Ar, Ar, Az) "dialkyl(diaryl, alkylaryl, acylalkyl, etc.)hydrazones"; and also with X = Η we have an "aldehyde hydrazone", with X = Alk, Ar, Az a "ketone hydrazone", and so on. If R' = NH 2 CO the compounds (II) are semicarbazones, and if R' = NH 2 CS they are thiosemicarbazones. Dihydrazones of a-dicarbonyl compounds are usually termed "osazones". Where X = Hal, NO 2 , OAlk, OAr, the compounds are α-halogeno-hydrazonest or Q!-nitro(alkoxy, aryloxy)hydrazones; when X = Ν: NR they are formazans, X = NHNHR hydrazidines, X = NH 2 , NHR, NRR' amidrazones; and with X = OH, SH hydrazides and thiohydrazides are formed. Furthermore, R' and Υ may together constitute the residue of a carbonyl compound, in which case the structure (II) acquires the form (ΙΠ), and compounds of this class are termed "azines":

Alkenes and Vibrations of C=N and N=N Links

“…The infrared spectra ofhydrazones have been studied by Wiley and Irick [67], and a thorough review of both infrared and Raman data is given by Kitaev et al [112]. The Raman data on semicarbazones and thiosemicarbazones are reviewed by Raevskii et al [113].…”

A Self‐Sacrificing Template Route to Spinel MIIIn2S4 (MII = Mn, Zn, Cd, Fe, Co, Ni) and MIIn5S8 (MI = Cu, Ag) Porous Microspheres

“…The corresponding ED patterns in Figure 2d show several diffraction rings, which can be characterized as the (111), (220), (311), (400), (511), and (440) planes (from inner to outer) and further reveal the cubic spinel structure of the product. ions, [39,40] [41] reacts on the surface of the spheres to form In 2.77 S 4 flakes in different directions. These flakes then collide with each other and yield an entangled network morphology.…”

(1E,1′E)-4,4′-[1,1′-(Hydrazine-1,2-diylidene)bis(ethan-1-yl-1-ylidene)]diphenol dihydrate

“…For related structures, see ; Fun et al (2010); Jansrisewangwong et al (2010). For background to and the biological activity of hydrozones, see: Bendre et al (1998); ElTabl et al (2008); Kitaev et al (1970); Qin et al (2009); Ramamohan et al (1995); Rollas & Kü çü kgü zel (2007). For the stability of the temperature controller used in the data collection, see : Cosier & Glazer (1986 Table 1 Hydrogen-bond geometry (Å , ).…”

“…Hydrazones have been reported to possess fluorescence properties (Qin et al, 2009) and various biological activities such as to be used as insecticides, antitumor agents and antioxidants (Kitaev et al, 1970), as well as antimicrobial (Ramamohan et al, 1995) and antiviral properties (El-Tabl et al, 2008;Rollas & Küçükgüzel, 2007) and tyrosinase inhibitory activity (Bendre et al, 1998). With our on-going research on structural studies and properties of hydrazones Fun et al, 2010;Jansrisewangwong et al, 2010), the title compound (I) was synthesized.…”