Beilstein J. Org. Chem.2018,14, 1120–1180, doi:10.3762/bjoc.14.98
; dibenzotropone; halobenzotropolone; halobenzotropone; tribenzotropone; tropone; Review
1. Introduction
Tropone (1) and tropolone (2) have fascinated organic chemists for well over one hundred years. The carbocycles 1 and 2 are a special variety of organic compounds and represent a nonbenzenoid type of aromatic
occurring tropones and tropolones [9]. In addition to this, chemistry of dibenzosuberenone, which is one of the dibenzotropone isomers, has already reviewed by us [45].
There are three possible benzotropone isomers: 4,5-benzotropone (11), 2,3-benzotropone (12), and 3,4-benzotropone (13, Figure 2). The
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Graphical Abstract
Scheme 1:
Tropone (1), tropolone (2) and their resonance structures.