Crystal structure of 9,9-diethyl-9H-fluorene-2,4,7-tricarbaldehyde

Abstract

The title compound, C20H18O3, crystallizes in the space group P21/c with one molecule in the asymmetric unit of the cell. The fluorene skeleton is nearly planar and the crystal structure is composed of molecular layers extending parallel to the (302) plane. Within a layer, one formyl oxygen atom participates in the formation of a Carene—H...O bond, which is responsible for the formation of an inversion symmetric supramolecular motif of graph set R 2 2(10). A second oxygen atom is involved in an intramolecular Carene—H...O hydrogen bond and is further connected with a formyl hydrogen atom of an adjacent molecule. A Hirshfeld surface analysis indicated that the most important contributions to the overall surface are from H...H (46.9%), O...H (27.9%) and C...H (17.8%) interactions.

Compounds Derived from 9,9‐Dialkylfluorenes: Syntheses, Crystal Structures and Initial Binding Studies (Part II)

“…9,9‐Diethyl‐9 H ‐fluorene‐2,4,7‐tricarbaldehyde [9,10a,b] and 2,4,7‐tris(bromomethyl)‐9,9‐diethyl‐9 H ‐fluorene [9,10a] were found to be useful starting materials for the synthesis of a wide range of 2,4,7‐trisubstituted 9,9‐diethyl‐9 H ‐fluorenes [3,4] . Compound 1 was prepared on the basis of two reaction pathways using the aforementioned starting materials (compounds 6 and 7 in Schemes 1 and 2, respectively).…”

“…101-103 °C. (10). Compound 8 (1.80 g, 8.10 mmol) and 2,4,7-tris(bromomethyl)-9,9-diethylfluorene (7, 1.00 g, 2.00 mmol) were dissolved in dry dioxane (20 mL).…”