In the 2H-chromene series, complexation of the aromatic ring with chromium tricarbonyl, under thermal conditions, is totally regioselective even when aromatic substituents are introduced on the pyran ring. The complexation stabilizes the open form of these photochromic compounds and reduces the ther
Synthesis and Properties of Novel (Tricarbonyl)(heptalene)chromium Complexes
✍ Scribed by Ekaterina A. Ochertyanova; Hans-Jürgen Hansen; Yuri A. Ustynyuk
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- German
- Weight
- 402 KB
- Volume
- 85
- Category
- Article
- ISSN
- 0018-019X
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Sequential reaction of the tricarbonyl[(h 6 -phenyl) carbamate]chromium complex 3 with chiral amide bases (see 4 and 5) and electrophiles yielded planar chiral ortho-substituted complexes 6 with up to 70% enantiomeric excess (ee) (Scheme 2, Table 1 and2). The enantiomer purity could be increased to