Ueber Derivate des Diketohydrindens

Abstract

ein ahnliches Condensationsproduct nicht liefert. Imrnerhin gewahrt das bis jetzt Festgestellte noch keine entscheidenden Anhaltspunkte fur die angefuhrte Formel.

T‐Shaped (Donor–π–)2Acceptor–π–Donor Push–Pull Systems Based on Indan‐1,3‐dione

“…[8] However, push-pull molecules with extraordinary arrangements such as V, Y, H, and X shapes have also been reported recently. [9][10][11][12] Since their first syntheses in 1888-89, [13] indan-1,3-dione and its derivatives have been used as dyestuffs (indenigo) [14] and as reagents for fingerprint development in forensic science (ninhydrin). [15] Later, indan-1,3-dione evolved into a powerful and readily accessible electron acceptor.…”

Reactions of 3,3-dialkyl-2,3-dihydro-6-trifluoromethyl-4-pyrones with hydroxylamine. Synthesis and structures of 5-(1,1-dialkyl-2-hydroxyethyl)-5-hydroxy-3-trifluoromethyl-Δ2-isoxazolines

“…Colorless crystals of 4a are monoclinic, at 293 K, a = 10.539 (6). b = 20.299 (13), c = 9.739(6) A, 13 = 90.05(5) ~ V = 2084(2) ..t3, dealt = 1.449 g cm -3, Z = 8 (CsHI2NO3F3). space group P2t/c (two crystallographicalty independent molecules per symmetric unit).…”

The reaction of active and stabilized phosphonium ylides with ?,?-unsaturated carbonyl compounds [1]

“…To a solution of 2-benzylidene-1,3-indandione (1) [17], 5-benzylidenebarbituric acid (11) [18], or 1,2-diphenyl-3,5-pyrazolidinedione (16) [19] (0.01 mole) in 20 mL of tetrahydrofuran was added dropwise, with stirring, at room temperature, a solution of the ketenylidene-(2a) [20] or thioketenylidnetriphenylphosphorane (2b) [20] (0.01 mole) in 30 mL of THF. The reaction mixture was left for 4 hours when 2a was used and for 8 hours with 2b.…”