Tricuspidalklappenfehler

Wink, K.

doi:10.1007/978-3-642-97060-3_55

Cited by 1 publication

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“…This is particularly important because directing strategies do not always work well, as in the complete non-specificity in the addition of chromium tricarbonyl to acetals derived from flourenone (Schl6gl & Sch61m, 1978;Wink, 1989). In point of fact, as this study suggests, the highly fluxional nature of five-membered heterocycles and of 1,3-dioxolanes in particular (Cremer & Pople, 1975) means that, even where one or another structure may be observed in solution in the solid state, other isomers are almost certainly dynamically accessible in solution.…”

Section: Et02~c02 Etmentioning

confidence: 99%

Structure of diethyl 2,3-O-fluorenylidene-L-tartrate

Wink¹,

Dewan²

1990

Acta Crystallogr C

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Abstract. C21H2006, Mr=368"39, orthorhombic, P2~2121, a = 11.669 (2), b = 14.975 (2), c = 10-663 (2) A, V = 1863 (2)/k 3, Z= 4, Dx = 1.31 g cm -3, A(Mo Ka) = 0.71069 A, F = 0.90 cm-1, F(000) = 7768, T = 203 K, R = 0.064 for 1233 unique data with I> 20,(/). The molecular structure is very close to having idealized twofold geometry with the two substituents on the acetal carbon displaced 1.06 and 1.28 A with respect to the dioxolane ring and the two ethoxycarbonyl groups on the 4 and 5 positions in equatorial positions; the torsional angle about the backbone is 87.4 (6) ° .Introduction. We have synthesized a homochiral dioxolane derived from fluorenone dimethylacetal and diethyl tartrate as part of a program in chiral organometallic reagents. The structure of the dioxolane, reported here, contains several remarkable features important for the study and possible application of homochiral dioxolanes in stereoselective synthesis.

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Section: Et02~c02 Etmentioning

confidence: 99%