Tricarbonyl[(4a,5,6,7,8,9-η)-2-methyl-2-phenyl-2<i>H</i>-benzo[<i>f</i>]chromen]chromium

Hannesschlager, Patrick; Brun, Pierre; Pèpe, Gérard

doi:10.1107/s0108270197014236

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Spectrokinetic Studies Of Complexes1

Complexation Reactions1

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2000

2007

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“…The differences observed for the non-complexed compounds between the [5,6]chromene series (1, 2 and 3) and the [7,8]chromene series (4, 5 and 6) were still present after complexation (1b, 2b, 3b and 4b, 5b, 6b).…”

Section: Spectrokinetic Studies Of Complexesmentioning

confidence: 94%

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Synthesis and photochromic properties of tricarbonylchromium complexes of 2H-?6-benzochromenes

Hannesschlager

Brun

2000

Appl. Organometal. Chem.

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Although in the 2H-chromene (benzopyran) series complexation with tricarbonylchromium, under thermal conditions, is totally regioselective, in the naphthopyran series the same reaction cannot be observed. We show here that with tricarbonyl(trispyridine)chromium as complexing agent, in the presence of Lewis acid, complexation of naphthopyrans can be achieved and is totally regioselective. The complexes formed are photochromic compounds, and their thermal bleaching kinetic constants are reduced as compared with the non-complexed homologous compound.

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Section: Spectrokinetic Studies Of Complexesmentioning

confidence: 94%

“…For compounds 1b, 2b and 3b position of the tricarbonylchromium moiety was verified by Xray crystallography. [7][8][9] The low yields can be explained by the fact that Figure 1 Chromium tricarbonyl complexation of 2H-benzochromenes. R, R' and R@ are specified for substrates 1-6 and products 1b-6b in Table 2.…”

Section: Complexation Reactionsmentioning

confidence: 99%